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How to use the Java substring method - IONOS
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target="_top">Java</a></li></ul> </aside> </div> <div class="col-12 col-lg-6 d-none d-md-block mt-2 mt-lg-0" style="display: none"> <figure class="image position-relative overflow-hidden align-center visual-img contain-style my-0 w-100 h-100"> <picture><source media="(min-width: 1680px)" srcset="https://www.ionos.com/digitalguide/fileadmin/_processed_/3/b/csm_child-theme-t_9697111b57.webp"/><source media="(min-width: 1400px)" srcset="https://www.ionos.com/digitalguide/fileadmin/_processed_/3/b/csm_child-theme-t_eeb4bb97d8.webp"/><source media="(min-width: 1200px)" srcset="https://www.ionos.com/digitalguide/fileadmin/_processed_/3/b/csm_child-theme-t_f36db933d9.webp"/><source media="(min-width: 922px)" srcset="https://www.ionos.com/digitalguide/fileadmin/_processed_/3/b/csm_child-theme-t_abd3c330db.webp"/><source media="(min-width: 768px)" srcset="https://www.ionos.com/digitalguide/fileadmin/_processed_/3/b/csm_child-theme-t_6c5832b6c9.webp"/><img src="data:image/svg+xml;base64,PHN2ZyB2aWV3Qm94PSIwIDAgMSAxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPgogICAgPHJlY3QgeD0iMCIgeT0iMCIgd2lkdGg9IjEiIGhlaWdodD0iMSIgZmlsbD0idHJhbnNwYXJlbnQiIGZpbGwtcnVsZT0iZXZlbm9kZCIvPgo8L3N2Zz4K" width="1200" height="630" title="How to use the Java substring method" alt="How to use the Java substring method" loading="eager" decoding="sync" class="img-fluid d-block mx-auto img-format-landscape w-100 h-100 object-fit-cover rounded-4 border border-1 border-brand-gray-100"/></picture> </figure> </div> </div> </div> </div> <div class="container-fluid container-sm"> <div class="row py-2 py-lg-5 contain-style position-relative gap-4 flex-xl-nowrap"> <section class="content col-12 col-xl-6 col-xxxl-7 contain-style order-2 position-relative overflow-hidden mw-xl-content-area"> <div id="c699513" class="mx-auto commonmark_content" data-ctype="commonmark_content"> <p>Java’s substring method is used to extract a substring from a larger string. There are two different ways to use it, either separating the string from an index to the end or with a pre-defined beginning and ending index for the substring.</p> <h2 id="content-what-is-the-java-substring-method-and-how-is-it-used">What is the Java substring method and how is it used?</h2> <p>In Java, characters, digits and special characters can be combined into a Java string. If you want to extract a specific subset from the larger string, you have several options. The method Java String.split() breaks an entire string down into its individual parts to, for example, give you a clearer overview of the string. The method <code class="rounded-pill brand-box-bg brand-box-border-color px-code-inline-x py-code-inline-y">substring()</code> takes that one step further and returns only the part of the string that you define. You can define which part of the string you want to extract using <strong>solely a start index or with both a start and end index</strong>. In this tutorial, we’ll introduce Java’s <code class="rounded-pill brand-box-bg brand-box-border-color px-code-inline-x py-code-inline-y">substring()</code> method in its different forms.</p> <div id="c171711" class="mx-auto guides_cta_images" data-ctype="guides_cta_images"><div class="position-relative my-4 rounded-4 p-4 layout-0 overflow-hidden"><div class="row d-flex flex-wrap align-items-bottom"><div class="col-12" style="z-index: 1"><div class="d-block mt-0 mx-0 mb-3 h3 headline"><div class="d-block mx-0 mt-0 mb-1 h5 preline"> Web Hosting </div> Fast, scalable hosting for any website </div></div><div class="col-12 col-sm"><ul class="checklist highlight"><li> 99.9% uptime </li><li> PHP 8.3 with JIT compiler </li><li> SSL, DDoS protection, and backups </li></ul></div><div class="col-12 col-sm-4 d-flex align-items-center justify-content-start justify-content-sm-end"><button data-linkid="guides.content.guides-cta-images.btn.webhosting-boxen-us.see-plans" type="submit" class="btn btn-cta stretched-link mb-sm-1 mt-3 mt-sm-0" onclick="globalSBSitecat('event121');window.open('https://www.ionos.com/hosting/web-hosting','_top')">See plans</button></div></div></div></div> <h2 id="content-how-to-use-java-substring-with-beginindex">How to use Java <code class="rounded-pill brand-box-bg brand-box-border-color px-code-inline-x py-code-inline-y">substring()</code> with <code class="rounded-pill brand-box-bg brand-box-border-color px-code-inline-x py-code-inline-y">beginIndex</code></h2> <p>As mentioned above, there are two ways to use Java’s <code class="rounded-pill brand-box-bg brand-box-border-color px-code-inline-x py-code-inline-y">substring()</code> method. The first <strong>only defines the starting point</strong> of the substring that you want to extract. It breaks up the string from that index to the last character of the string. Its syntax looks as follows:</p> <div class="prism-container position-relative my-4"><pre class="rounded-4 m-0 p-2 pt-3 brand-box-bg border brand-box-border-color"><code class="language-java">String substring(int beginIndex)</code></pre><span class="programming-language-label badge brand-body-bg-vice-versa text-white rounded-5 position-absolute top-0 start-0">java</span></div> <p>To use <code class="rounded-pill brand-box-bg brand-box-border-color px-code-inline-x py-code-inline-y">substring()</code>, you’ll first enter the string that you want to extract the substring from. Then you use an integer to define where the substring should begin. You can view the output with the <a data-t3-link="true" target="_top" href="https://www.ionos.com/digitalguide/websites/web-development/java-commands/" data-linkid="guides.content.link.int-guides.java-command" class="link-internal" title="Java commands" data-guides-target-uid="23473">Java command</a> <code class="rounded-pill brand-box-bg brand-box-border-color px-code-inline-x py-code-inline-y">System.out.println</code>. The method works <strong>inclusively</strong>, meaning that the character that is in the position of the index you enter will also be separated. If the value of <code class="rounded-pill brand-box-bg brand-box-border-color px-code-inline-x py-code-inline-y">beginIndex</code> is smaller than 0 or larger than the actual length of the string, you’ll get an error message.</p> <p>Let’s look at a simple example to see how exactly <code class="rounded-pill brand-box-bg brand-box-border-color px-code-inline-x py-code-inline-y">substring()</code> works in Java. We’ll create a string and then extract a substring.</p> <div class="prism-container position-relative my-4"><pre class="rounded-4 m-0 p-2 pt-3 brand-box-bg border brand-box-border-color"><code class="language-java">public class Main { public static void main(String args[]) { String Str = new String("This is an example. This is another sentence."); System.out.print("The substring is: "); System.out.println(Str.substring(20)); } }</code></pre><span class="programming-language-label badge brand-body-bg-vice-versa text-white rounded-5 position-absolute top-0 start-0">java</span></div> <p>When you run the code, you’ll get the following output:</p> <div class="prism-container position-relative my-4"><pre class="rounded-4 m-0 p-2 pt-3 brand-box-bg border brand-box-border-color"><code class="language-java">The substring is: This is another sentence.</code></pre><span class="programming-language-label badge brand-body-bg-vice-versa text-white rounded-5 position-absolute top-0 start-0">java</span></div> <p>Of course that works just as well with digits:</p> <div class="prism-container position-relative my-4"><pre class="rounded-4 m-0 p-2 pt-3 brand-box-bg border brand-box-border-color"><code class="language-java">public class Main { public static void main(String args[]) { String Str = new String("192.448.782.1142"); System.out.print("The last four digits are: "); System.out.println(Str.substring(12)); } }</code></pre><span class="programming-language-label badge brand-body-bg-vice-versa text-white rounded-5 position-absolute top-0 start-0">java</span></div> <p>Here is the output:</p> <div class="prism-container position-relative my-4"><pre class="rounded-4 m-0 p-2 pt-3 brand-box-bg border brand-box-border-color"><code class="language-java">The last four digits are: 1142</code></pre><span class="programming-language-label badge brand-body-bg-vice-versa text-white rounded-5 position-absolute top-0 start-0">java</span></div> <h2 id="content-how-to-use-substring-with-beginindex-and-endindex">How to use <code class="rounded-pill brand-box-bg brand-box-border-color px-code-inline-x py-code-inline-y">substring()</code> with <code class="rounded-pill brand-box-bg brand-box-border-color px-code-inline-x py-code-inline-y">beginIndex</code> and <code class="rounded-pill brand-box-bg brand-box-border-color px-code-inline-x py-code-inline-y">endIndex</code></h2> <p>The second way to use Java’s <code class="rounded-pill brand-box-bg brand-box-border-color px-code-inline-x py-code-inline-y">substring()</code> method allows for more control over the resulting substring. You’ll not only specify the starting point of the substring but also <strong>an end point</strong>. The syntax looks as follows:</p> <div class="prism-container position-relative my-4"><pre class="rounded-4 m-0 p-2 pt-3 brand-box-bg border brand-box-border-color"><code class="language-java">String substring(int beginIndex, int endIndex)</code></pre><span class="programming-language-label badge brand-body-bg-vice-versa text-white rounded-5 position-absolute top-0 start-0">java</span></div> <p>The <code class="rounded-pill brand-box-bg brand-box-border-color px-code-inline-x py-code-inline-y">beginIndex</code> is inclusive, and the <code class="rounded-pill brand-box-bg brand-box-border-color px-code-inline-x py-code-inline-y">endIndex</code> is exclusive. Let’s once again look at a simple example:</p> <div class="prism-container position-relative my-4"><pre class="rounded-4 m-0 p-2 pt-3 brand-box-bg border brand-box-border-color"><code class="language-java">public class Main { public static void main(String args[]) { String Str = new String("This is an example. This is another sentence."); System.out.print("The substring is: "); System.out.println(Str.substring(8, 18)); } }</code></pre><span class="programming-language-label badge brand-body-bg-vice-versa text-white rounded-5 position-absolute top-0 start-0">java</span></div> <p>The output is:</p> <div class="prism-container position-relative my-4"><pre class="rounded-4 m-0 p-2 pt-3 brand-box-bg border brand-box-border-color"><code class="language-java">The substring is: an example</code></pre><span class="programming-language-label badge brand-body-bg-vice-versa text-white rounded-5 position-absolute top-0 start-0">java</span></div> <p>You can also easily extract a substring from within a single word. In the next example, we’ll create a grocery list:</p> <div class="prism-container position-relative my-4"><pre class="rounded-4 m-0 p-2 pt-3 brand-box-bg border brand-box-border-color"><code class="language-java">public class Main { public static void main(String args[]) { String Str = new String("Eggs, Honey, Milk, Bread"); System.out.print("The substring is: "); System.out.println(Str.substring(7, 10)); } }</code></pre><span class="programming-language-label badge brand-body-bg-vice-versa text-white rounded-5 position-absolute top-0 start-0">java</span></div> <p>The new output will look as follows:</p> <div class="prism-container position-relative my-4"><pre class="rounded-4 m-0 p-2 pt-3 brand-box-bg border brand-box-border-color"><code class="language-java">The substring is: one</code></pre><span class="programming-language-label badge brand-body-bg-vice-versa text-white rounded-5 position-absolute top-0 start-0">java</span></div> <p>In our last example we’ll show a practical use case for Java’s <code class="rounded-pill brand-box-bg brand-box-border-color px-code-inline-x py-code-inline-y">substring()</code> method. Imagine that you’ve received customer data in a certain format. If you want to isolate just a part of that information, <code class="rounded-pill brand-box-bg brand-box-border-color px-code-inline-x py-code-inline-y">substring()</code> is perfect. Let’s look at the code:</p> <div class="prism-container position-relative my-4"><pre class="rounded-4 m-0 p-2 pt-3 brand-box-bg border brand-box-border-color"><code class="language-java">public class Main { public static void main(String args[]) { String Str = new String("247: Taylor, Javal|taylorj@example.com|New York|12.04.1972"); System.out.print("Here is the customer’s email address: "); System.out.println(Str.substring(19, 38)); } }</code></pre><span class="programming-language-label badge brand-body-bg-vice-versa text-white rounded-5 position-absolute top-0 start-0">java</span></div> <p>Here is the output:</p> <div class="prism-container position-relative my-4"><pre class="rounded-4 m-0 p-2 pt-3 brand-box-bg border brand-box-border-color"><code class="language-java">Here is the customer’s email address: taylorj@example.com</code></pre><span class="programming-language-label badge brand-body-bg-vice-versa text-white rounded-5 position-absolute top-0 start-0">java</span></div> 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Java StringBuilder allows you to manipulate the stored string using various methods. In our article, you can find out how the class works, what…</p><div class="mt-2 minh-5 d-flex flex-nowrap overflow-hidden"><ul class="nav d-flex flex-nowrap card-tags-fade-end w-100 gap-2"><li><span class="btn btn-sm btn-default">Tutorials</span></li><li><span class="btn btn-sm btn-default">Java</span></li></ul></div><div class="read-more px-0 pb-0 pt-1 m-0 position-relative end-0 text-end lh-1 d-flex align-items-center justify-content-end"><span class="d-inline-block me-1">Read more</span><svg width="16" height="16" class="icon-arrow-right"><use xlink:href="https://www.ionos.com/digitalguide/_assets/b76f27cb02ebc538ac6fbabcf1a88e7f/Images/icons-sprite.svg#icon-arrow-right"></use></svg></div></div></article> </div> </aside> </div> </article> <footer class="d-flex flex-wrap justify-content-center align-items-center brand-footer-bg brand-footer-color mt-2 mt-lg-5 py-6 py-lg-12 contain-style" data-bs-theme="dark"><div class="container-fluid container-sm"><div class="row pb-4 pb-lg-8"><div 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