Java 8 Features - Complete Tutorial

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data-gfg-action="report-article" onclick="report_article();"> <i class="gfg-icon gfg-icon_report"></i> <span>Report</span> </div> </div>  </div> <div class="article--viewer_Gnews tooltip"> <a class="three_dot_dropdown_inner_div Gnews_wrapper" href ='https://news.google.com/publications/CAAqBwgKMLTrzwsw44bnAw?hl=en-IN&gl=IN&ceid=IN%3Aen' target="_blank"> <img class="gfg-icon_Gnews no-zoom-in-cursor" src=https://media.geeksforgeeks.org/auth-dashboard-uploads/Google-news.svg loading="lazy" alt="News"></img> <span class='kebab_menu_news_text'>Follow</span> </a> </div> </div> </div> <div class="text"> <p dir="ltr" style="text-align: justify;"><span>Java 8 is the most awaited release of Java programming language development because, in the entire history of Java, it never released that many major features. It consists of major features of Java. It is a new version of Java and was released by Oracle on 18 March 2014. Java provided support for functional programming, new Java 8 APIs, a new JavaScript engine, new Java 8 streaming API, functional interfaces, default methods, date-time API changes, etc.</span></p> <img alt="Java 8 Tutorial" height="inherit" src="https://media.geeksforgeeks.org/wp-content/uploads/20230505133602/Java-8-Tutorial.webp" srcset="https://media.geeksforgeeks.org/wp-content/uploads/20230505133602/Java-8-Tutorial.webp 1000w, https://media.geeksforgeeks.org/wp-content/uploads/20230505133602/Java-8-Tutorial-100.webp 100w, https://media.geeksforgeeks.org/wp-content/uploads/20230505133602/Java-8-Tutorial-200.webp 200w, https://media.geeksforgeeks.org/wp-content/uploads/20230505133602/Java-8-Tutorial-300.webp 300w, https://media.geeksforgeeks.org/wp-content/uploads/20230505133602/Java-8-Tutorial-660.webp 660w, https://media.geeksforgeeks.org/wp-content/uploads/20230505133602/Java-8-Tutorial-768.webp 768w, " width="1000"/> <h3><span>Major Java 8 Features Introduced</span></h3> <p dir="ltr"><span>There are a few major Java 8 features mentioned below: </span></p><div id="GFG_AD_gfg_mobile_336x280" style="margin: 5px 0;"></div> <ul> <li value="1"><b><strong>Lambda Expressions</strong></b><span>: Concise functional code using </span><code><span>-></span></code><span>.</span></li> <li value="2"><b><strong>Functional Interfaces</strong></b><span>: Single-method interfaces.</span></li> <li value="3"><b><strong>Introduced and Improved APIs:</strong></b><span> </span> <ol> <li value="1"><b><strong>Stream API</strong></b><span>: Efficient Data Manipulation.</span></li> <li value="2"><b><strong>Date/Time API</strong></b><span>: Robust Date and Time Handling.</span></li> <li value="3"><b><strong>Collection API Improvements</strong></b><span>: Enhanced Methods for Collections (e.g., </span><code><span>removeIf</span></code><span>, </span><code><span>replaceAll</span></code><span>).</span></li> <li value="4"><b><strong>Concurrency API Improvements</strong></b><span>: New classes for parallel processing (e.g., </span><code><span>CompletableFuture</span></code><span>).</span></li> </ol> </li> <li value="4"><b><strong>Optional Class</strong></b><span>: Handle null values safely.</span></li> <li value="5"><b><code><strong>forEach()</strong></code></b><b><strong> Method in Iterable Interface</strong></b><span>: Executes an action for each element in a Collection.</span></li> <li value="6"><b><strong>Default Methods</strong></b><span>: Evolve interfaces without breaking compatibility.</span></li> <li value="7"><b><strong>Static Methods</strong></b><span>: Allows adding methods with default implementations to interfaces.</span></li> <li value="8"><b><strong>Method References</strong></b><span>: Refer to methods easily.</span></li> </ul> <p dir="ltr" style="text-align: justify;"><span>This Java 8 tutorial covers all the important Java 8 features like Java 8 APIs, Java arrays, Java 8 ArrayList, and many more included in the Java 8 programming language. To explore detail features of Java language you can explore </span><a href="https://www.geeksforgeeks.org/courses/free-java-course-online" rel="noopener" target="_blank"><span>Java course</span></a><span>, in this course you will get a free full beginner to advanced topics of Java programming.</span></p> <h2><span>Java 8 Features</span></h2> <ul> <li value="1"><a href="#lambda"><span>Lambda Expressions</span></a></li> <li value="2"><a href="#functional"><span>Functional Interfaces</span></a></li> <li value="3"><a href="#reference"><span>Method Reference</span></a></li> <li value="4"><a href="#streams"><span>Streams</span></a></li> <li value="5"><a href="#comp"><span>Comparable and Comparator</span></a></li> <li value="6"><a href="#optional"><span>Optional Class</span></a></li> <li value="7"><a href="#datetime"><span>Date/Time API</span></a></li> <li value="8"><a href="#misc"><span>Miscellaneous</span></a></li> </ul> <h2><span>Lambda Expressions</span></h2> <p dir="ltr"><span>Lambda Expression basically expresses an instance of the functional interface, in other words, you can say it provides a clear and concise way to represent a method of the functional interface using an expression. Lambda Expressions are added in Java 8.</span></p> <ul> <li value="1"><a href="https://www.geeksforgeeks.org/lambda-expressions-java-8/" rel="noopener"><span>Lambda Expressions in Java 8</span></a></li> <li value="2"><a href="https://www.geeksforgeeks.org/java-lambda-expressions-parameters/" rel="noopener"><span>Lambda Expressions Parameters</span></a></li> <li value="3"><a href="https://www.geeksforgeeks.org/java-lambda-expression-with-collections/" rel="noopener"><span>Java Lambda Expression with Collections</span></a></li> <li value="4"><a href="https://www.geeksforgeeks.org/java-lambda-expression-variable-capturing-with-examples/" rel="noopener"><span>Lambda Expression Variable Capturing with Examples</span></a></li> <li value="5"><a href="https://www.geeksforgeeks.org/how-to-create-thread-using-lambda-expressions-in-java/" rel="noopener"><span>How to Create Thread using Lambda Expressions in Java?</span></a></li> <li value="6"><a href="https://www.geeksforgeeks.org/serialization-of-lambda-expression-in-java/" rel="noopener"><span>Serialization of Lambda Expression in Java</span></a></li> <li value="7"><a href="https://www.geeksforgeeks.org/block-lambda-expressions-in-java/" rel="noopener"><span>Block Lambda Expressions in Java</span></a></li> <li value="8"><a href="https://www.geeksforgeeks.org/match-lambdas-to-interfaces-in-java/" rel="noopener"><span>Match Lambdas to Interfaces in Java</span></a></li> <li value="9"><a href="https://www.geeksforgeeks.org/converting-arraylist-to-hashmap-in-java-8-using-a-lambda-expression/" rel="noopener"><span>Converting ArrayList to HashMap in Java 8 using a Lambda Expression</span></a></li> <li value="10"><a href="https://www.geeksforgeeks.org/check-if-a-string-contains-only-alphabets-in-java-using-lambda-expression/" rel="noopener"><span>Check if a String Contains Only Alphabets in Java Using Lambda Expression</span></a></li> <li value="11"><a href="https://www.geeksforgeeks.org/remove-elements-from-a-list-that-satisfy-given-predicate-in-java/" rel="noopener"><span>Remove Elements From a List that Satisfy a Given Predicate in Java</span></a></li> </ul> <h2><span>Functional Interfaces</span></h2> <p dir="ltr"><span>An interface that contains only one abstract method is known as a functional interface, but there is no restriction, you can have </span><b><strong>n </strong></b><span>number of default and static methods inside a functional interface.</span></p> <ul> <li value="1"><a href="https://www.geeksforgeeks.org/functional-interfaces-java/" rel="noopener"><span>Functional Interfaces in Java</span></a></li> <li value="2"><a href="https://www.geeksforgeeks.org/java-8-consumer-interface-in-java-with-examples/" rel="noopener"><span>Consumer Interface in Java with Examples</span></a></li> <li value="3"><a href="https://www.geeksforgeeks.org/java-8-biconsumer-interface-in-java-with-examples/" rel="noopener"><span>BiConsumer Interface in Java with Examples</span></a></li> <li value="4"><a href="https://www.geeksforgeeks.org/java-8-predicate-with-examples/" rel="noopener"><span>Predicate Interface with Examples</span></a></li> <li value="5"><a href="https://www.geeksforgeeks.org/function-interface-in-java-with-examples/" rel="noopener"><span>Function Interface in Java with Examples</span></a></li> <li value="6"><a href="https://www.geeksforgeeks.org/supplier-interface-in-java-with-examples/" rel="noopener"><span>Supplier Interface in Java with Examples</span></a></li> </ul> <h2><span>Method Reference</span></h2> <p dir="ltr"><span>Method reference is a shorthand notation of a lambda expression to call a method. There are four types of method references that are as follows:</span></p> <ul> <li value="1"><span>Static Method Reference</span></li> <li value="2"><span>Instance Method Reference of a particular object</span></li> <li value="3"><span>Instance Method Reference of an arbitrary object of a particular type</span></li> <li value="4"><span>Constructor Reference.</span></li> </ul> <p dir="ltr"><b><strong>Example:</strong></b></p><div id="GFG_AD_Desktop_InContent_ATF_336x280" style="text-align:center; max-height: 280px;"></div><div id="GFG_AD_gfg_mobile_336x280_1" style="margin: 5px 0;"></div> <pre><span>numList.stream().filter(n -> n > 5).sorted().forEach(System.out::println);</span></pre> <ul> <li value="1"><a href="https://www.geeksforgeeks.org/method-references-in-java-with-examples/" rel="noopener"><span>Method References in Java with examples</span></a></li> <li value="2"><a href="https://www.geeksforgeeks.org/converting-arraylist-to-hashmap-using-method-reference-in-java-8/" rel="noopener"><span>Converting ArrayList to HashMap using Method Reference in Java 8</span></a></li> </ul> <h2><span>Streams</span></h2> <p dir="ltr"><span>Stream API is introduced in Java 8 and is used to process collections of objects with the functional style of coding using the lambda expression. So to understand what stream API is, you must have knowledge of both lambda and functional interfaces.</span></p><div id="_GFG_ABP_Incontent_728x90" style="text-align:center;"></div> <ul> <li value="1"><a href="https://www.geeksforgeeks.org/java-8-stream-tutorial/" rel="noopener"><span>Java 8 Stream</span></a></li> <li value="2"><a href="https://www.geeksforgeeks.org/difference-between-streams-and-collections-in-java/" rel="noopener"><span>Difference Between Streams and Collections in Java</span></a></li> <li value="3"><a href="https://www.geeksforgeeks.org/implement-filter-function-using-reduce-in-java-8-streams/" rel="noopener"><span>Implement Filter Function using Reduce in Java 8 Streams</span></a></li> <li value="4"><a href="https://www.geeksforgeeks.org/java-stream-api-filters/" rel="noopener"><span>Java Stream API – Filters</span></a></li> <li value="5"><a href="https://www.geeksforgeeks.org/parallel-vs-sequential-stream-in-java/" rel="noopener"><span>Parallel vs Sequential Stream in Java</span></a></li> <li value="6"><a href="https://www.geeksforgeeks.org/functional-programming-in-java-8-using-the-stream-api-with-example/" rel="noopener"><span>Functional Programming in Java 8+ using the Stream API with Example</span></a></li> <li value="7"><a href="https://www.geeksforgeeks.org/intermediate-methods-of-stream-in-java/" rel="noopener"><span>Intermediate Methods of Stream in Java</span></a></li> <li value="8"><a href="https://www.geeksforgeeks.org/difference-between-map-and-flatmap-in-java-stream/" rel="noopener"><span>Difference Between map() And flatMap() In Java Stream</span></a></li> <li value="9"><a href="https://www.geeksforgeeks.org/array-stream-java/" rel="noopener"><span>Array to Stream in Java</span></a></li> <li value="10"><a href="https://www.geeksforgeeks.org/10-ways-to-create-a-stream-in-java/" rel="noopener"><span>10 Ways to Create a Stream in Java</span></a></li> <li value="11"><a href="https://www.geeksforgeeks.org/how-to-print-elements-of-a-stream-in-java-8/" rel="noopener"><span>How to Print Elements of a Stream in Java 8</span></a></li> <li value="12"><a href="https://www.geeksforgeeks.org/collecting-a-stream-to-an-immutable-collection-in-java/" rel="noopener"><span>Collecting a Stream to an Immutable Collection in Java</span></a></li> <li value="13"><a href="https://www.geeksforgeeks.org/comparing-streams-to-loops-in-java/" rel="noopener"><span>Comparing Streams to Loops in Java</span></a></li> <li value="14"><a href="https://www.geeksforgeeks.org/why-you-need-to-close-the-java-streams-in-finally-block/" rel="noopener"><span>Why You Need to Close the Java Streams in Finally Block?</span></a></li> <li value="15"><a href="https://www.geeksforgeeks.org/convert-an-iterable-to-stream-in-java/" rel="noopener"><span>Convert an Iterable to Stream in Java</span></a></li> <li value="16"><a href="https://www.geeksforgeeks.org/convert-an-iterator-to-stream-in-java/" rel="noopener"><span>Convert an Iterator to Stream in Java</span></a></li> <li value="17"><a href="https://www.geeksforgeeks.org/difference-between-stream-of-and-arrays-stream-method-in-java/" rel="noopener"><span>Difference Between Stream.of() and Arrays.stream() method in Java</span></a></li> <li value="18"><a href="https://www.geeksforgeeks.org/convert-stream-set-java/" rel="noopener"><span>Convert Stream to Set in Java</span></a></li> <li value="19"><a href="https://www.geeksforgeeks.org/convert-set-stream-java/" rel="noopener"><span>Convert a Set to Stream in Java</span></a></li> <li value="20"><a href="https://www.geeksforgeeks.org/streams-arrays-java-8/" rel="noopener"><span>Streams on Arrays in Java 8</span></a></li> </ul> <h2><span>Java Stream Programs</span></h2> <p dir="ltr"><span>Java Streams provide a powerful and expressive way to process sequences of elements in Java, enabling functional-style operations on collections of data. The Stream API, introduced in Java 8, facilitates efficient data manipulation and transformation using a sequence of operations that can be performed in parallel or sequentially</span></p> <p dir="ltr"><span>. Java Stream Programs will give a clear view to the topic: </span></p> <ul> <li value="1"><a href="https://www.geeksforgeeks.org/program-to-convert-a-map-to-a-stream-in-java/" rel="noopener"><span>Program to Convert a Map to a Stream in Java</span></a></li> <li value="2"><a href="https://www.geeksforgeeks.org/program-to-convert-boxed-array-to-stream-in-java/" rel="noopener"><span>Program to Convert Boxed Array to Stream in Java</span></a></li> <li value="3"><a href="https://www.geeksforgeeks.org/program-to-convert-primitive-array-to-stream-in-java/" rel="noopener"><span>Program to Convert Primitive Array to Stream in Java</span></a></li> <li value="4"><a href="https://www.geeksforgeeks.org/program-to-convert-a-set-to-stream-in-java-using-generics/" rel="noopener"><span>Program to Convert a Set to Stream in Java using Generics</span></a></li> <li value="5"><a href="https://www.geeksforgeeks.org/program-to-convert-list-to-stream-in-java/" rel="noopener"><span>Program to Convert List to Stream in Java</span></a></li> <li value="6"><a href="https://www.geeksforgeeks.org/program-to-convert-stream-to-an-array-in-java/" rel="noopener"><span>Program to Convert Stream to an Array in Java</span></a></li> <li value="7"><a href="https://www.geeksforgeeks.org/how-to-get-slice-of-a-stream-in-java/" rel="noopener"><span>How to get Slice of a Stream in Java</span></a></li> <li value="8"><a href="https://www.geeksforgeeks.org/flattening-nested-collections-in-java/" rel="noopener"><span>Flattening Nested Collections in Java</span></a></li> <li value="9"><a href="https://www.geeksforgeeks.org/how-to-convert-a-stream-into-a-map-in-java/" rel="noopener"><span>How to Convert a Stream into a Map in Java</span></a></li> <li value="10"><a href="https://www.geeksforgeeks.org/find-the-first-element-of-a-stream-in-java/" rel="noopener"><span>Find the First Element of a Stream in Java</span></a></li> <li value="11"><a href="https://www.geeksforgeeks.org/find-the-last-element-of-a-stream-in-java/" rel="noopener"><span>Find the Last Element of a Stream in Java</span></a></li> <li value="12"><a href="https://www.geeksforgeeks.org/how-to-find-duplicate-elements-in-a-stream-in-java/" rel="noopener"><span>How to Find Duplicate Elements in a Stream in Java</span></a></li> <li value="13"><a href="https://www.geeksforgeeks.org/count-occurrence-of-a-given-character-in-a-string-using-stream-api-in-java/" rel="noopener"><span>Count the Occurrence of a Given Character in a String Using Stream API in Java</span></a></li> <li value="14"><a href="https://www.geeksforgeeks.org/reverse-elements-of-a-parallel-stream-in-java/" rel="noopener"><span>Reverse Elements of a Parallel Stream in Java</span></a></li> <li value="15"><a href="https://www.geeksforgeeks.org/how-to-get-arraylist-from-stream-in-java-8/" rel="noopener"><span>How to Get ArrayList From Stream in Java 8</span></a></li> <li value="16"><a href="https://www.geeksforgeeks.org/generate-infinite-stream-of-double-in-java/" rel="noopener"><span>Generate Infinite Stream of Double in Java</span></a></li> <li value="17"><a href="https://www.geeksforgeeks.org/generate-infinite-stream-of-integers-in-java/" rel="noopener"><span>Generate Infinite Stream of Integers in Java</span></a></li> <li value="18"><a href="https://www.geeksforgeeks.org/program-to-iterate-over-a-stream-with-indices-in-java-8/" rel="noopener"><span>Program to Iterate over a Stream with Indices in Java 8</span></a></li> <li value="19"><a href="https://www.geeksforgeeks.org/flatten-a-stream-of-arrays-in-java-using-foreach-loop/" rel="noopener"><span>Flatten a Stream of Arrays in Java using forEach loop</span></a></li> <li value="20"><a href="https://www.geeksforgeeks.org/flatten-a-stream-of-lists-in-java-using-foreach-loop/" rel="noopener"><span>Flatten a Stream of Lists in Java using forEach loop</span></a></li> <li value="21"><a href="https://www.geeksforgeeks.org/flatten-a-stream-of-map-in-java-using-foreach-loop/" rel="noopener"><span>Flatten a Stream of Map in Java using forEach loop</span></a></li> <li value="22"><a href="https://www.geeksforgeeks.org/convert-a-string-to-a-list-of-characters-in-java/" rel="noopener"><span>Convert a String to a List of Characters in Java</span></a></li> <li value="23"><a href="https://www.geeksforgeeks.org/initialize-a-list-in-a-single-line-with-a-specified-value-using-java-stream/" rel="noopener"><span>Initialize a List in a Single Line with a Specified Value using Java Stream</span></a></li> </ul> <h2><span>Java Stream Methods</span></h2> <p dir="ltr"><span>Methods related to one of the most powerful features of Java Stream are mentioned below.</span></p> <ul> <li value="1"><a href="https://www.geeksforgeeks.org/stream-foreach-method-java-examples/" rel="noopener"><span>Stream forEach() method in Java with Examples</span></a></li> <li value="2"><a href="https://www.geeksforgeeks.org/stream-foreachordered-method-java-examples/" rel="noopener"><span>Stream forEachOrdered() Method in Java with Examples</span></a></li> <li value="3"><a href="https://www.geeksforgeeks.org/foreach-loop-vs-stream-foreach-vs-parallel-stream-foreach/" rel="noopener"><span>foreach() loop vs Stream foreach() vs Parallel Stream foreach()</span></a></li> <li value="4"><a href="https://www.geeksforgeeks.org/stream-of-method-in-java/" rel="noopener"><span>Stream of() method in Java</span></a></li> <li value="5"><a href="https://www.geeksforgeeks.org/java-stream-findany-with-examples/" rel="noopener"><span>Java Stream findAny() with Examples</span></a></li> <li value="6"><a href="https://www.geeksforgeeks.org/stream-anymatch-java-examples/" rel="noopener"><span>Stream anyMatch() in Java with Examples</span></a></li> <li value="7"><a href="https://www.geeksforgeeks.org/stream-allmatch-java-examples/" rel="noopener"><span>Stream allMatch() in Java with Examples</span></a></li> <li value="8"><a href="https://www.geeksforgeeks.org/stream-filter-java-examples/" rel="noopener"><span>Stream filter() in Java with Examples</span></a></li> <li value="9"><a href="https://www.geeksforgeeks.org/stream-sorted-comparator-comparator-method-java/" rel="noopener"><span>Stream sorted (Comparator comparator) Method in Java</span></a></li> <li value="10"><a href="https://www.geeksforgeeks.org/stream-sorted-in-java/" rel="noopener"><span>Stream sorted() in Java</span></a></li> <li value="11"><a href="https://www.geeksforgeeks.org/stream-distinct-java/" rel="noopener"><span>Stream.distinct() in Java</span></a></li> <li value="12"><a href="https://www.geeksforgeeks.org/stream-concat-java/" rel="noopener"><span>Stream.concat() in Java</span></a></li> <li value="13"><a href="https://www.geeksforgeeks.org/stream-reduce-java-examples/" rel="noopener"><span>Stream.reduce() in Java with Examples</span></a></li> <li value="14"><a href="https://www.geeksforgeeks.org/stream-limit-method-in-java/" rel="noopener"><span>stream.limit() method in Java</span></a></li> <li value="15"><a href="https://www.geeksforgeeks.org/stream-ofnullablet-method-in-java-with-examples/" rel="noopener"><span>Stream ofNullable(T) method in Java with Examples</span></a></li> <li value="16"><a href="https://www.geeksforgeeks.org/stream-dropwhile-method-in-java-with-examples/" rel="noopener"><span>Stream dropWhile() method in Java with Examples</span></a></li> <li value="17"><a href="https://www.geeksforgeeks.org/stream-iteratetpredicateunaryoperator-method-in-java-with-examples/" rel="noopener"><span>Stream iterate(T,Predicate,UnaryOperator) Method in Java with Examples</span></a></li> <li value="18"><a href="https://www.geeksforgeeks.org/stream-takewhile-method-in-java-with-examples/" rel="noopener"><span>Stream takeWhile() method in Java with Examples</span></a></li> <li value="19"><a href="https://www.geeksforgeeks.org/concat-method-of-stream-interface-in-java-api/" rel="noopener"><span>concat() Method of Stream Interface in Java API</span></a></li> <li value="20"><a href="https://www.geeksforgeeks.org/stream-findfirst-java-examples/" rel="noopener"><span>Stream findFirst() in Java with Examples</span></a></li> <li value="21"><a href="https://www.geeksforgeeks.org/doublestream-maptoobj-in-java/" rel="noopener"><span>DoubleStream mapToObj() in Java</span></a></li> <li value="22"><a href="https://www.geeksforgeeks.org/stream-builder-accept-method-in-java/" rel="noopener"><span>Stream.Builder accept() Method in Java</span></a></li> <li value="23"><a href="https://www.geeksforgeeks.org/intstream-builder-add-method-in-java/" rel="noopener"><span>IntStream.Builder add() Method in Java</span></a></li> <li value="24"><a href="https://www.geeksforgeeks.org/doublestream-builder-build-in-java/" rel="noopener"><span>DoubleStream.Builder build() in Java</span></a></li> <li value="25"><a href="https://www.geeksforgeeks.org/stream-builder-java-examples/" rel="noopener"><span>Stream.Builder build() in Java</span></a></li> <li value="26"><a href="https://www.geeksforgeeks.org/java-8-streams-collectors-joining-method-with-examples/" rel="noopener"><span>Collectors.joining() Method with Examples</span></a></li> <li value="27"><a href="https://www.geeksforgeeks.org/stream-builder-java-examples/" rel="noopener"><span>Stream builder() in Java with Examples</span></a></li> <li value="28"><a href="https://www.geeksforgeeks.org/stream-empty-java-examples/" rel="noopener"><span>Stream empty() in Java with Examples</span></a></li> <li value="29"><a href="https://www.geeksforgeeks.org/longstream-flatmaplongfunction-mapper-java/" rel="noopener"><span>LongStream flatMap(LongFunction mapper) in Java</span></a></li> <li value="30"><a href="https://www.geeksforgeeks.org/longstream-filter-java-examples/" rel="noopener"><span>LongStream filter() in Java with Examples</span></a></li> </ul> <h2><span>Comparable and Comparator</span></h2> <p dir="ltr"><span>Comparable and Comparator are interfaces used to order objects. They are particularly useful in sorting operations and collections that require natural ordering. Here we will learn about Comparable and Comparator in depth.</span></p> <ul> <li value="1"><a href="https://www.geeksforgeeks.org/comparable-vs-comparator-in-java/" rel="noopener"><span>Comparable vs Comparator in Java</span></a></li> <li value="2"><a href="https://www.geeksforgeeks.org/comparator-interface-java/" rel="noopener"><span>Comparator Interface in Java with Examples</span></a></li> <li value="3"><a href="https://www.geeksforgeeks.org/why-to-use-comparator-interface-rather-than-comparable-interface-in-java/" rel="noopener"><span>Why to Use Comparator Interface Rather than Comparable Interface in Java?</span></a></li> <li value="4"><a href="https://www.geeksforgeeks.org/sort-an-array-of-triplet-using-java-comparable-and-comparator/" rel="noopener"><span>Sort an Array of Triplet using Java Comparable and Comparator</span></a></li> <li value="5"><a href="https://www.geeksforgeeks.org/java-program-to-sort-linkedlist-using-comparable/" rel="noopener"><span>Java Program to Sort LinkedList using Comparable</span></a></li> <li value="6"><a href="https://www.geeksforgeeks.org/how-to-sort-hashset-elements-using-comparable-interface-in-java/" rel="noopener"><span>How to Sort HashSet Elements using Comparable Interface in Java?</span></a></li> <li value="7"><a href="https://www.geeksforgeeks.org/sort-linkedhashmap-by-values-using-comparable-interface-in-java/" rel="noopener"><span>Sort LinkedHashMap by Values using Comparable Interface in Java</span></a></li> <li value="8"><a href="https://www.geeksforgeeks.org/sort-linkedhashmap-by-keys-using-comparable-interface-in-java/" rel="noopener"><span>Sort LinkedHashMap by Keys using Comparable Interface in Java</span></a></li> <li value="9"><a href="https://www.geeksforgeeks.org/how-to-sort-linkedhashset-elements-using-comparable-interface-in-java/" rel="noopener"><span>How to Sort LinkedHashSet Elements using Comparable Interface in Java?</span></a></li> </ul> <h2><span>Optional Class</span></h2> <ul> <li value="1"><a href="https://www.geeksforgeeks.org/java-8-optional-class/" rel="noopener"><span>Java 8 Optional Class</span></a></li> <li value="2"><a href="https://www.geeksforgeeks.org/optional-ofnullable-method-in-java-with-examples/" rel="noopener"><span>Optional ofNullable() Method in Java with Examples</span></a></li> <li value="3"><a href="https://www.geeksforgeeks.org/optional-orelse-method-in-java-with-examples/" rel="noopener"><span>Optional orElse() Method in Java with Examples</span></a></li> <li value="4"><a href="https://www.geeksforgeeks.org/optional-ifpresentorelse-method-in-java-with-examples/" rel="noopener"><span>Optional ifPresentOrElse() Method in Java with Examples</span></a></li> <li value="5"><a href="https://www.geeksforgeeks.org/optional-orelseget-method-in-java-with-examples/" rel="noopener"><span>Optional orElseGet() Method in Java with Examples</span></a></li> <li value="6"><a href="https://www.geeksforgeeks.org/optional-filter-method-in-java-with-examples/" rel="noopener"><span>Optional filter() Method in Java with Examples</span></a></li> <li value="7"><a href="https://www.geeksforgeeks.org/optional-empty-method-in-java-with-examples/" rel="noopener"><span>Optional empty() Method in Java with Examples</span></a></li> <li value="8"><a href="https://www.geeksforgeeks.org/optional-hashcode-method-in-java-with-examples/" rel="noopener"><span>Optional hashCode() Method in Java with Examples</span></a></li> <li value="9"><a href="https://www.geeksforgeeks.org/optional-tostring-method-in-java-with-examples/" rel="noopener"><span>Optional toString() Method in Java with Examples</span></a></li> <li value="10"><a href="https://www.geeksforgeeks.org/optional-equals-method-in-java-with-examples/" rel="noopener"><span>Optional equals() Method in Java with Examples</span></a></li> <li value="11"><a href="https://www.geeksforgeeks.org/optional-stream-method-in-java-with-examples/" rel="noopener"><span>Optional stream() Method in Java with examples</span></a></li> <li value="12"><a href="https://www.geeksforgeeks.org/optional-or-method-in-java-with-examples/" rel="noopener"><span>Optional or() Method in Java with Examples</span></a></li> <li value="13"><a href="https://www.geeksforgeeks.org/optional-get-method-in-java-with-examples/" rel="noopener"><span>Optional get() Method in Java with Examples</span></a></li> <li value="14"><a href="https://www.geeksforgeeks.org/optional-ispresent-method-in-java-with-examples/" rel="noopener"><span>Optional isPresent() Method in Java with Examples</span></a></li> <li value="15"><a href="https://www.geeksforgeeks.org/optional-orelsethrow-method-in-java-with-examples/" rel="noopener"><span>Optional orElseThrow() Method in Java with Examples</span></a></li> <li value="16"><a href="https://www.geeksforgeeks.org/optional-of-method-in-java-with-examples/" rel="noopener"><span>Optional of() method in Java with Examples</span></a></li> </ul> <h2><span>Date/Time API</span></h2> <p dir="ltr"><span>This section gives you to handle the ever-changing world of dates and times within your Java programs. Explore working with calendars, timestamps, and time manipulation – essential skills for building applications that deal with deadlines, scheduling, or even historical data analysis.</span></p> <ul> <li value="1"><a href="https://www.geeksforgeeks.org/new-date-time-api-java8/" rel="noopener"><span>Date-Time API in Java 8</span></a></li> <li value="2"><a href="https://www.geeksforgeeks.org/java-time-localdate-class-in-java/" rel="noopener"><span>java.time.LocalDate Class in Java</span></a></li> <li value="3"><a href="https://www.geeksforgeeks.org/java-time-localtime-class-in-java/" rel="noopener"><span>java.time.LocalTime Class in Java</span></a></li> <li value="4"><a href="https://www.geeksforgeeks.org/java-time-localdatetime-class-in-java/" rel="noopener"><span>java.time.LocalDateTime Class in Java</span></a></li> <li value="5"><a href="https://www.geeksforgeeks.org/java-time-monthday-class-in-java/" rel="noopener"><span>java.time.MonthDay Class in Java</span></a></li> <li value="6"><a href="https://www.geeksforgeeks.org/java-time-offsettime-class-in-java/" rel="noopener"><span>java.time.OffsetTime Class in Java</span></a></li> <li value="7"><a href="https://www.geeksforgeeks.org/java-time-offsetdatetime-class-in-java/" rel="noopener"><span>java.time.OffsetDateTime Class in Java</span></a></li> <li value="8"><a href="https://www.geeksforgeeks.org/java-time-clock-class-in-java/" rel="noopener"><span>java.time.Clock Class in Java</span></a></li> <li value="9"><a href="https://www.geeksforgeeks.org/java-time-zoneddatetime-class-in-java/" rel="noopener"><span>java.time.ZonedDateTime Class in Java</span></a></li> <li value="10"><a href="https://www.geeksforgeeks.org/java-time-zoneid-class-in-java/" rel="noopener"><span>java.time.ZoneId Class in Java</span></a></li> <li value="11"><a href="https://www.geeksforgeeks.org/java-time-zoneoffset-class-in-java/" rel="noopener"><span>java.time.ZoneOffset Class in Java</span></a></li> <li value="12"><a href="https://www.geeksforgeeks.org/java-time-year-class-in-java/" rel="noopener"><span>java.time.Year Class in Java</span></a></li> <li value="13"><a href="https://www.geeksforgeeks.org/java-time-yearmonth-class-in-java/" rel="noopener"><span>java.time.YearMonth Class in Java</span></a></li> <li value="14"><a href="https://www.geeksforgeeks.org/java-time-period-class-in-java/" rel="noopener"><span>java.time.Period Class in Java</span></a></li> <li value="15"><a href="https://www.geeksforgeeks.org/java-time-duration-class-in-java/" rel="noopener"><span>java.time.Duration Class in Java</span></a></li> <li value="16"><a href="https://www.geeksforgeeks.org/java-time-instant-class-in-java/" rel="noopener"><span>java.time.Instant Class in Java</span></a></li> <li value="17"><a href="https://www.geeksforgeeks.org/java-8-clock-instant-method-with-examples/" rel="noopener"><span>Java 8 Clock instant() method with Examples</span></a></li> <li value="18"><a href="https://www.geeksforgeeks.org/java-8-clock-fixed-method-with-examples/" rel="noopener"><span>Java 8 Clock fixed() method with Examples</span></a></li> </ul> <h2><span>Miscellaneous</span></h2> <p dir="ltr"><span>Java is a versatile and powerful programming language that encompasses a wide range of features and tools, enabling developers to build robust, high-performance applications. Let us learn some Java Miscellaneous topics are mentioned below:</span></p> <ul> <li value="1"><a href="https://www.geeksforgeeks.org/default-methods-java/" rel="noopener"><span>Default Methods In Java 8</span></a></li> <li value="2"><a href="https://www.geeksforgeeks.org/static-method-in-interface-in-java/" rel="noopener"><span>Static method in Interface in Java</span></a></li> <li value="3"><a href="https://www.geeksforgeeks.org/can-we-override-default-method-in-java/" rel="noopener"><span>Can We Override Default Method in Java?</span></a></li> <li value="4"><a href="https://www.geeksforgeeks.org/arraylist-foreach-method-in-java/" rel="noopener"><span>forEach() method in Java</span></a></li> <li value="5"><a href="https://www.geeksforgeeks.org/nashorn-javascript-engine-in-java-with-examples/" rel="noopener"><span>Nashorn JavaScript Engine in Java with Examples</span></a></li> <li value="6"><a href="https://www.geeksforgeeks.org/metaspace-in-java-8-with-examples/" rel="noopener"><span>MetaSpace in Java 8 with Examples</span></a></li> <li value="7"><a href="https://www.geeksforgeeks.org/java-class-dependency-analyzer-in-java-8-with-examples/" rel="noopener"><span>Java class dependency analyzer in Java 8 with Examples</span></a></li> <li value="8"><a href="https://www.geeksforgeeks.org/longunaryoperator-interface-in-java/" rel="noopener"><span>LongUnaryOperator Interface in Java</span></a></li> <li value="9"><a href="https://www.geeksforgeeks.org/intunaryoperator-interface-in-java/" rel="noopener"><span>IntUnaryOperator Interface in Java</span></a></li> <li value="10"><a href="https://www.geeksforgeeks.org/doubleunaryoperator-interface-in-java/" rel="noopener"><span>DoubleUnaryOperator Interface in Java</span></a></li> <li value="11"><a href="https://www.geeksforgeeks.org/unaryoperator-interface-in-java/" rel="noopener"><span>UnaryOperator Interface in Java</span></a></li> <li value="12"><a href="https://www.geeksforgeeks.org/java-8-objlongconsumer-interface-with-example/" rel="noopener"><span>ObjLongConsumer Interface with Example</span></a></li> <li value="13"><a href="https://www.geeksforgeeks.org/java-8-objintconsumer-interface-with-example/" rel="noopener"><span>ObjIntConsumer Interface with Example</span></a></li> <li value="14"><a href="https://www.geeksforgeeks.org/java-8-objdoubleconsumer-interface-with-example/" rel="noopener"><span>ObjDoubleConsumer Interface with Example</span></a></li> <li value="15"><a href="https://www.geeksforgeeks.org/java-8-doublesupplier-interface-with-examples/" rel="noopener"><span>DoubleSupplier Interface with Examples</span></a></li> <li value="16"><a href="https://www.geeksforgeeks.org/java-8-booleansupplier-interface-with-examples/" rel="noopener"><span>BooleanSupplier Interface with Examples</span></a></li> <li value="17"><a href="https://www.geeksforgeeks.org/java-8-intsupplier-interface-with-examples/" rel="noopener"><span>IntSupplier Interface with Examples</span></a></li> <li value="18"><a href="https://www.geeksforgeeks.org/java-8-longsupplier-interface-with-examples/" rel="noopener"><span>LongSupplier Interface with Examples</span></a></li> <li value="19"><a href="https://www.geeksforgeeks.org/longconsumer-interface-in-java-with-examples/" rel="noopener"><span>LongConsumer Interface in Java with Examples</span></a></li> <li value="20"><a href="https://www.geeksforgeeks.org/doubleconsumer-interface-in-java-with-examples/" rel="noopener"><span>DoubleConsumer Interface in Java with Examples</span></a></li> <li value="21"><a href="https://www.geeksforgeeks.org/intconsumer-interface-in-java-with-examples/" rel="noopener"><span>IntConsumer Interface in Java with Examples</span></a></li> <li value="22"><a href="https://www.geeksforgeeks.org/longfunction-interface-in-java-with-examples/" rel="noopener"><span>LongFunction Interface in Java with Examples</span></a></li> <li value="23"><a href="https://www.geeksforgeeks.org/intfunction-interface-in-java-with-examples/" rel="noopener"><span>IntFunction Interface in Java with Examples</span></a></li> <li value="24"><a href="https://www.geeksforgeeks.org/todoublefunction-interface-in-java-with-examples/" rel="noopener"><span>ToDoubleFunction Interface in Java with Examples</span></a></li> <li value="25"><a href="https://www.geeksforgeeks.org/doublefunction-interface-in-java-with-examples/" rel="noopener"><span>DoubleFunction Interface in Java with Examples</span></a></li> <li value="26"><a href="https://www.geeksforgeeks.org/tointfunction-interface-in-java-with-examples/" rel="noopener"><span>ToIntFunction Interface in Java with Examples</span></a></li> <li value="27"><a href="https://www.geeksforgeeks.org/longtointfunction-interface-in-java-with-examples/" rel="noopener"><span>LongToIntFunction Interface in Java with Examples</span></a></li> <li value="28"><a href="https://www.geeksforgeeks.org/tolongfunction-interface-in-java-with-examples/" rel="noopener"><span>ToLongFunction Interface in Java with Examples</span></a></li> <li value="29"><a href="https://www.geeksforgeeks.org/longtodoublefunction-interface-in-java-with-examples/" rel="noopener"><span>LongToDoubleFunction Interface in Java with Examples</span></a></li> <li value="30"><a href="https://www.geeksforgeeks.org/tolongbifunction-interface-in-java-with-examples/" rel="noopener"><span>ToLongBiFunction Interface in Java with Examples</span></a></li> <li value="31"><a href="https://www.geeksforgeeks.org/tointbifunction-interface-in-java-with-examples/" rel="noopener"><span>ToIntBiFunction Interface in Java with Examples</span></a></li> <li value="32"><a href="https://www.geeksforgeeks.org/todoublebifunction-interface-in-java-with-examples/" rel="noopener"><span>ToDoubleBiFunction Interface in Java with Examples</span></a></li> <li value="33"><a href="https://www.geeksforgeeks.org/java-8-doubletolongfunction-interface-in-java-with-examples/" rel="noopener"><span>DoubleToLongFunction Interface in Java with Examples</span></a></li> <li value="34"><a href="https://www.geeksforgeeks.org/java-8-inttodoublefunction-interface-in-java-with-examples/" rel="noopener"><span>IntToDoubleFunction Interface in Java with Examples</span></a></li> <li value="35"><a href="https://www.geeksforgeeks.org/java-8-inttolongfunction-interface-in-java-with-examples/" rel="noopener"><span>IntToLongFunction Interface in Java with Examples</span></a></li> <li value="36"><a href="https://www.geeksforgeeks.org/java-8-doubletointfunction-interface-in-java-with-example/" rel="noopener"><span>DoubleToIntFunction Interface in Java with Example</span></a></li> <li value="37"><a href="https://www.geeksforgeeks.org/java-8-arraydeque-removeif-method-in-java-with-examples/" rel="noopener"><span>ArrayDeque removeIf() method in Java with Examples</span></a></li> </ul> <h2><span>Conclusion</span></h2> <p dir="ltr" style="text-align: justify;"><span>Java 8 has brought many exciting features that make it a powerful tool for developers. With the introduction of Lambda expressions, Stream API, and new Date and Time API, Java 8 has improved code efficiency and readability. These Java 8 features allow developers to write more flexible and concise code, making their work easier and more enjoyable. Overall, Java 8 continues to be a valuable update that has significantly enhanced the Java programming language.</span></p> <h2><span>Java 8 Features – FAQs</span></h2> <h3><span>Q1: </span><b><strong>What are the features of java8?</strong></b></h3> <blockquote> <ul> <li value="1"><span>default and static methods</span></li> <li value="2"><span>Functional Interfaces and Lambda Expressions</span></li> <li value="3"><span>Collection API</span></li> <li value="4"><span>Java Time API</span></li> <li value="5"><span>forEach() method</span></li> <li value="6"><span>Concurrency API</span></li> <li value="7"><span>Java Stream API</span></li> </ul> </blockquote> <h3><span>Q2: What advantages does Java 8 bring?</span></h3> <blockquote> <ul> <li value="1"><span>Code is more concise and readable</span></li> <li value="2"><span>Code is more reusable</span></li> <li value="3"><span>Code is more testable and maintainable</span></li> <li value="4"><span>Code is now both callable and concurrent</span></li> <li value="5"><span>Users can write parallel code</span></li> <li value="6"><span>Users can write database-like operations</span></li> <li value="7"><span>Applications now perform better</span></li> <li value="8"><span>Code is far more productive</span></li> </ul> </blockquote> <h3><span>Q3: What is a functional interface?</span></h3> <blockquote> <p dir="ltr"><span>A functional interface is an interface that contains just one abstract method.</span></p> </blockquote> <h3><span>Q4: How are functional interfaces and Lambda Expressions related?</span></h3> <blockquote> <p dir="ltr"><span>Lambda expressions are applied only to the functional interface’s abstract method.</span></p> </blockquote> <br/><div id="AP_G4GR_6"></div> <div class='article_bottom_text'></div><br> <div id="video-tab-content" class="video-tab-content"> <div style="text-align: center; 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It is cleaner and more readable than the traditional for loop and is commonly used when the exact index of an element is not required. Example: Below is a basic e</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">6 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/java-while-loop-with-examples/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Java while Loop </div> <div class="gfg-similar-read-item-subheading">Java while loop is a control flow statement used to execute the block of statements repeatedly until the given condition evaluates to false. Once the condition becomes false, the line immediately after the loop in the program is executed. Let's go through a simple example of a Java while loop: [GFGT</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">3 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/java-do-while-loop-with-examples/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Java Do While Loop </div> <div class="gfg-similar-read-item-subheading">Java do-while loop is an Exit control loop. Unlike for or while loop, a do-while check for the condition after executing the statements of the loop body. Example: [GFGTABS] Java // Java program to show the use of do while loop public class GFG { public static void main(String[] args) { int c = 1; //</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">4 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/break-statement-in-java/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Java Break Statement </div> <div class="gfg-similar-read-item-subheading">The Break Statement in Java is a control flow statement used to terminate loops and switch cases. 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Example: [GFGTABS]</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">3 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/continue-statement-in-java/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Continue Statement in Java </div> <div class="gfg-similar-read-item-subheading">Suppose a person wants code to execute for the values as per the code is designed to be executed but forcefully the same user wants to skip out the execution for which code should have been executed as designed above but will not as per the demand of the user. 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Usage of return keyword as there exist two ways as listed below as follows: Case 1: Methods returning a valueCase 2: Methods not returning a valueLet us illustrat</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">6 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li></ul></div><div class="leftbar-dropdown"><h2 class="dropdown-title">Java Methods<span class="gfg-icon gfg-icon_arrow-down-thin"></span></h2><ul style="display: none;"><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/methods-in-java/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Java Methods </div> <div class="gfg-similar-read-item-subheading">The method in Java or Methods of Java is a collection of statements that perform some specific tasks and return the result to the caller. 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Example: [GFGTABS] Java // Java Program to Demonstrate // Multi Dimensional Array import java.io.*; public class Main { public static void main(String[] args)</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">9 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/jagged-array-in-java/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Jagged Array in Java </div> <div class="gfg-similar-read-item-subheading">In Java, Jagged array is an array of arrays such that member arrays can be of different sizes, i.e., we can create a 2-D array but with a variable number of columns in each row. 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Objects are seen by the viewer or user, performing tasks you assign. Object-oriented programmin</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">12 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/classes-objects-java/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Classes and Objects in Java </div> <div class="gfg-similar-read-item-subheading">In Java, classes and objects are basic concepts of Object Oriented Programming (OOPs) that are used to represent real-world concepts and entities. The class represents a group of objects having similar properties and behavior. For example, the animal type Dog is a class while a particular dog named</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">11 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/constructors-in-java/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Java Constructors </div> <div class="gfg-similar-read-item-subheading">Java constructors or constructors in Java is a terminology used to construct something in our programs. A constructor in Java is a special method that is used to initialize objects. The constructor is called when an object of a class is created. It can be used to set initial values for object attrib</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">8 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/object-class-in-java/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Object Class in Java </div> <div class="gfg-similar-read-item-subheading">Object class is present in java.lang package. Every class in Java is directly or indirectly derived from the Object class. If a class does not extend any other class then it is a direct child class of Object and if extends another class then it is indirectly derived. Therefore the Object class metho</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">7 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/abstraction-in-java-2/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Abstraction in Java </div> <div class="gfg-similar-read-item-subheading">Abstraction in Java is the process in which we only show essential details/functionality to the user. The non-essential implementation details are not displayed to the user. In this article, we will learn about abstraction and what abstraction means. Simple Example to understand Abstraction:Televisi</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">11 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/encapsulation-in-java/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Encapsulation in Java </div> <div class="gfg-similar-read-item-subheading">Encapsulation in Java is a fundamental concept in object-oriented programming (OOP) that refers to the bundling of data and methods that operate on that data within a single unit, which is called a class in Java. Java Encapsulation is a way of hiding the implementation details of a class from outsid</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">8 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/inheritance-in-java/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Inheritance in Java </div> <div class="gfg-similar-read-item-subheading">Java, Inheritance is an important pillar of OOP(Object-Oriented Programming). It is the mechanism in Java by which one class is allowed to inherit the features(fields and methods) of another class. In Java, Inheritance means creating new classes based on existing ones. A class that inherits from ano</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">13 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/polymorphism-in-java/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Polymorphism in Java </div> <div class="gfg-similar-read-item-subheading">The word 'polymorphism' means 'having many forms'. In simple words, we can define Java Polymorphism as the ability of a message to be displayed in more than one form. In this article, we will learn what is polymorphism and its type. Real-life Illustration of Polymorphism in Java: A person can have d</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">6 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/method-overloading-in-java/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Method Overloading in Java </div> <div class="gfg-similar-read-item-subheading">In Java, Method Overloading allows different methods to have the same name, but different signatures where the signature can differ by the number of input parameters or type of input parameters, or a mixture of both. Method overloading in Java is also known as Compile-time Polymorphism, Static Polym</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">9 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/overriding-in-java/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Overriding in Java </div> <div class="gfg-similar-read-item-subheading">In Java, Overriding is a feature that allows a subclass or child class to provide a specific implementation of a method that is already provided by one of its super-classes or parent classes. When a method in a subclass has the same name, the same parameters or signature, and the same return type(or</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">13 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/packages-in-java/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Packages In Java </div> <div class="gfg-similar-read-item-subheading">Package in Java is a mechanism to encapsulate a group of classes, sub packages and interfaces. Packages are used for: Preventing naming conflicts. For example there can be two classes with name Employee in two packages, college.staff.cse.Employee and college.staff.ee.EmployeeMaking searching/locatin</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">8 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li></ul></div><div class="leftbar-dropdown"><h2 class="dropdown-title">Java Interfaces<span class="gfg-icon gfg-icon_arrow-down-thin"></span></h2><ul style="display: none;"><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/interfaces-in-java/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Interfaces in Java </div> <div class="gfg-similar-read-item-subheading">An Interface in Java programming language is defined as an abstract type used to specify the behavior of a class. An interface in Java is a blueprint of a behavior. A Java interface contains static constants and abstract methods. What are Interfaces in Java?The interface in Java is a mechanism to ac</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">11 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/interfaces-and-inheritance-in-java/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Interfaces and Inheritance in Java </div> <div class="gfg-similar-read-item-subheading">A class can extend another class and can implement one and more than one Java interface. Also, this topic has a major influence on the concept of Java and Multiple Inheritance. Note: This Hierarchy will be followed in the same way, we cannot reverse the hierarchy while inheritance in Java. This mean</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">7 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/differences-between-interface-and-class-in-java/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Differences between Interface and Class in Java </div> <div class="gfg-similar-read-item-subheading">This article highlights the differences between a class and an interface in Java. They seem syntactically similar, both containing methods and variables, but they are different in many aspects. Differences between a Class and an Interface The following table lists all the major differences between a</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">4 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/functional-interfaces-java/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Functional Interfaces in Java </div> <div class="gfg-similar-read-item-subheading">Java has forever remained an Object-Oriented Programming language. By object-oriented programming language, we can declare that everything present in the Java programming language rotates throughout the Objects, except for some of the primitive data types and primitive methods for integrity and simp</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">10 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/interface-nested-class-another-interface/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Nested Interface in Java </div> <div class="gfg-similar-read-item-subheading">We can declare interfaces as members of a class or another interface. Such an interface is called a member interface or nested interface. Interfaces declared outside any class can have only public and default (package-private) access specifiers. In Java, nested interfaces (interfaces declared inside</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">5 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/marker-interface-java/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Marker interface in Java </div> <div class="gfg-similar-read-item-subheading">It is an empty interface (no field or methods). Examples of marker interface are Serializable, Cloneable and Remote interface. All these interfaces are empty interfaces. public interface Serializable { // nothing here } Examples of Marker Interface which are used in real-time applications : Cloneabl</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">3 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/comparator-interface-java/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Comparator Interface in Java with Examples </div> <div class="gfg-similar-read-item-subheading">A comparator interface is used to order the objects of user-defined classes. A comparator object is capable of comparing two objects of the same class. Following function compare obj1 with obj2. Syntax: public int compare(Object obj1, Object obj2):Suppose we have an Array/ArrayList of our own class</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">6 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li></ul></div><div class="leftbar-dropdown"><h2 class="dropdown-title">Java Collections<span class="gfg-icon gfg-icon_arrow-down-thin"></span></h2><ul style="display: none;"><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/collections-in-java-2/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Collections in Java </div> <div class="gfg-similar-read-item-subheading">Any group of individual objects that are represented as a single unit is known as a Java Collection of Objects. In Java, a separate framework named the "Collection Framework" has been defined in JDK 1.2 which holds all the Java Collection Classes and Interface in it. In Java, the Collection interfac</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">15+ min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/collections-class-in-java/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Collections Class in Java </div> <div class="gfg-similar-read-item-subheading">Collections class in Java is one of the utility classes in Java Collections Framework. The java.util package contains the Collections class in Java. Java Collections class is used with the static methods that operate on the collections or return the collection. All the methods of this class throw th</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">14 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/collection-interface-in-java-with-examples/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Collection Interface in Java with Examples </div> <div class="gfg-similar-read-item-subheading">The Collection interface is a member of the Java Collections Framework. It is a part of java.util package. It is one of the root interfaces of the Collection Hierarchy. The Collection interface is not directly implemented by any class. However, it is implemented indirectly via its subtypes or subint</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">8 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/list-interface-java-examples/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Java List Interface </div> <div class="gfg-similar-read-item-subheading">The List Interface in Java extends the Collection Interface and is a part of java.util package. It is used to store the ordered collections of elements. So in a Java List, you can organize and manage the data sequentially. Maintained the order of elements in which they are added.Allows the duplicate</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">15+ min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/arraylist-in-java/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">ArrayList in Java </div> <div class="gfg-similar-read-item-subheading">Java ArrayList is a part of collections framework and it is a class of java.util package. It provides us with dynamic arrays in Java. Though, it may be slower than standard arrays but can be helpful in programs where lots of manipulation in array is required. The main advantage of ArrayList is, unli</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">10 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/java-util-vector-class-java/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Vector Class in Java </div> <div class="gfg-similar-read-item-subheading">The Vector class implements a growable array of objects. Vectors fall in legacy classes, but now it is fully compatible with collections. It is found in java.util package and implement the List interface. Thread-Safe: All methods are synchronized, making it suitable for multi-threaded environments.</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">13 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/linked-list-in-java/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">LinkedList in Java </div> <div class="gfg-similar-read-item-subheading">Linked List is a part of the Collection framework present in java.util package. This class is an implementation of the LinkedList data structure which is a linear data structure where the elements are not stored in contiguous locations and every element is a separate object with a data part and addr</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">13 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/stack-class-in-java/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Stack Class in Java </div> <div class="gfg-similar-read-item-subheading">Java Collection framework provides a Stack class that models and implements a Stack data structure. The class is based on the basic principle of LIFO(last-in-first-out). In addition to the basic push and pop operations, the class provides three more functions of empty, search, and peek. The Stack cl</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">11 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/set-in-java/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Set in Java </div> <div class="gfg-similar-read-item-subheading">The Set Interface is present in java.util package and extends the Collection interface. It is an unordered collection of objects in which duplicate values cannot be stored. It is an interface that implements the mathematical set. This interface adds a feature that restricts the insertion of the dupl</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">14 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/hashset-in-java/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Java HashSet </div> <div class="gfg-similar-read-item-subheading">HashSet in Java implements the Set interface of Collections Framework. It is used to store the unique elements and it doesn't maintain any specific order of elements. Can store the Null values.Uses HashTable internally.Also implements Serializable and Cloneable interfaces.HashSet is not thread-safe.</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">12 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/treeset-in-java-with-examples/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">TreeSet in Java </div> <div class="gfg-similar-read-item-subheading">TreeSet is one of the most important implementations of the SortedSet interface in Java that uses a Tree(red - black tree) for storage. The ordering of the elements is maintained by a set using their natural ordering whether or not an explicit comparator is provided. This must be consistent with equ</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">13 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/linkedhashset-in-java-with-examples/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">LinkedHashSet in Java with Examples </div> <div class="gfg-similar-read-item-subheading">Let us start with a simple Java code snippet that demonstrates how to create a LinkedHashSet object without adding any elements to it: [GFGTABS] Java import java.util.LinkedHashSet; public class LinkedHashSetCreation { public static void main(String[] args) { // Create a LinkedHashSet of Strings Lin</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">9 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/queue-interface-java/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Queue Interface In Java </div> <div class="gfg-similar-read-item-subheading">The Queue Interface is present in java.util package and extends the Collection interface. It stores and processes the data in FIFO(First In First Out) order. It is an ordered list of objects limited to inserting elements at the end of the list and deleting elements from the start of the list. No Nul</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">13 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/priority-queue-class-in-java/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">PriorityQueue in Java </div> <div class="gfg-similar-read-item-subheading">The PriorityQueue class in Java is part of the java.util package. It is known that a Queue follows the FIFO(First-In-First-Out) Algorithm, but the elements of the Queue are needed to be processed according to the priority, that's when the PriorityQueue comes into play. The PriorityQueue is based on</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">11 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/deque-interface-java-example/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Deque interface in Java with Example </div> <div class="gfg-similar-read-item-subheading">Deque Interface present in java.util package is a subtype of the queue interface. 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Therefore it behaves a bit differently from the rest of the collection types. No Duplicates in Keys: Ensures that keys are unique. H</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">12 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/java-util-hashmap-in-java-with-examples/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">HashMap in Java </div> <div class="gfg-similar-read-item-subheading">In Java, HashMap is part of the Java Collections Framework and is found in the java.util package. It provides the basic implementation of the Map interface in Java. HashMap stores data in (key, value) pairs. 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[GFGTABS] Java import java.util.Hashtable; public class HashtableCreation { public static void main(String args[]) { // Create a Hashtable of String keys and Integer values Hashtable<String, Integer</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">14 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/java-util-dictionary-class-java/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Java.util.Dictionary Class in Java </div> <div class="gfg-similar-read-item-subheading">The java.util.Dictionary class in Java is an abstract class that represents a collection of key-value pairs, where keys are unique and are used to access the values. 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This interface contains the methods inherited from the Set interface and adds a feature that stores all the elements in this</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">8 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/comparator-interface-java/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Comparator Interface in Java with Examples </div> <div class="gfg-similar-read-item-subheading">A comparator interface is used to order the objects of user-defined classes. A comparator object is capable of comparing two objects of the same class. Following function compare obj1 with obj2. 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Types of Cursors in JavaThere are three cursors in Java as mentioned below: IteratorEnumerationList</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">14 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li></ul></div><div class="leftbar-dropdown"><h2 class="dropdown-title">Java Exception Handling<span class="gfg-icon gfg-icon_arrow-down-thin"></span></h2><ul style="display: none;"><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/exceptions-in-java/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Exceptions in Java </div> <div class="gfg-similar-read-item-subheading">Exception Handling in Java is one of the effective means to handle runtime errors so that the regular flow of the application can be preserved. 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Java Exception Handling is a mechanism to handle runtime errors such as NullPointerException, ArrayIndexOutOfBoundsException, etc. In this article, we will</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">4 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/user-defined-custom-exception-in-java/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">User-defined Custom Exception in Java </div> <div class="gfg-similar-read-item-subheading">An exception is an issue (run time error) that occurred during the execution of a program. When an exception occurred the program gets terminated abruptly and, the code past the line that generated the exception never gets executed. Java provides us the facility to create our own exceptions which ar</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">3 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/chained-exceptions-java/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Chained Exceptions in Java </div> <div class="gfg-similar-read-item-subheading">Chained Exceptions allows to relate one exception with another exception, i.e one exception describes cause of another exception. 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NullPointerException is thrown when a program attempts to use an object reference that has the null value. 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It helps to maintain the normal flow of the program. In any object-orient</div> </div> <div class="reading-time"> <i class="reading-time-icon" data-gfg-action="readingtime"></i> <span style="color: var(--recommendation-card-text-color);font-size: 14px;font-weight: 500;line-height: 17px;">6 min read</span> </div> </a><hr style="background:var(--gfg-selected-color); width:70%; margin: 0 auto;"></hr></li></ul></div><div class="leftbar-dropdown"><h2 class="dropdown-title">Java Multithreading<span class="gfg-icon gfg-icon_arrow-down-thin"></span></h2><ul style="display: none;"><li class="similarReadDropdownItem"><a href="https://www.geeksforgeeks.org/java-multithreading-tutorial/?ref=lbp"><div class="gfg-similar-read-item-content"> <div class="gfg-similar-read-item-heading">Java Multithreading Tutorial </div> <div class="gfg-similar-read-item-subheading">Threads are the backbone of multithreading. 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