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How do I insert elements in a Java list?
<h2>Solution</h2><p>We can insert element to an array list easily using its add() method.</p><h3>Syntax</h3><pre class="result notranslate">boolean add(E e)</pre><p>Appends the specified element to the end of this list.</p><h2>Type Parameter</h2><ul class="list"><li><p><strong>E </strong> − The runtime type of the element to be added.</p></li></ul><h3>Parameters</h3><ul class="list"><li><p><strong>e </strong> − Element to be appended to this list</p></li></ul><h3>Returns</h3><p>It returns true.</p><h3>Throws</h3><ul class="list"><li><p><strong>UnsupportedOperationException </strong>− If the add operation is not supported by this list</p></li><li><p><strong>ClassCastException</strong> − If the class of the specified element prevents it from being added to this list.</p></li><li><p><strong>NullPointerException</strong> − If the specified element is null and this list does not permit null elements.</p></li><li><p><strong>IllegalArgumentException</strong> − If some property of this element prevents it from being added to this list.</p></li></ul><h2>Example</h2><p>The following example shows how to insert elements to the list using add() method.</p><pre class="demo-code notranslate language-java" data-lang="java">package com.tutorialspoint; import java.util.ArrayList; import java.util.List; public class CollectionsDemo { public static void main(String[] args) { // Create a list object List<String> list = new ArrayList<>(); // add elements to the list list.add("A"); list.add("B"); list.add("C"); // print the list System.out.println(list); } }</pre><h2>Output</h2><p>This will produce the following result −</p><pre class="result notranslate">[A, B, C]</pre>
Updated on 09-May-2022 11:21:29
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