Convert ArrayList to List java

Example 1: Convert the Java List into Array

import java.util.ArrayList; class Main { public static void main[String[] args] { ArrayList languages = new ArrayList[]; // Add elements in the list languages.add["Java"]; languages.add["Python"]; languages.add["JavaScript"]; System.out.println["ArrayList: " + languages]; // Create a new array of String type String[] arr = new String[languages.size[]]; // Convert ArrayList into the string array languages.toArray[arr]; System.out.print["Array: "]; for[String item:arr] { System.out.print[item+", "]; } } }

Output

List: [Java, Python, JavaScript] Array: Java, Python, JavaScript,

In the above example, we have created an list named languages. Here, we have used the ArrayList class to implement the List.

Notice the line,

languages.toArray[arr];

Here, the toArray[] method converts the list languages into an array. And stores it in the string array arr.

Note: If we don't pass any argument to the toArray[] method, the method returns an array of the Object type.

Example 2: Convert Java Array to List

import java.util.Arrays; import java.util.ArrayList; import java.util.List; class Main { public static void main[String[] args] { // create an array String[] array = {"Java", "Python", "C"}; System.out.println["Array: " + Arrays.toString[array]]; // convert array to list List languages= new ArrayList[Arrays.asList[array]]; System.out.println["List: " + languages]; } }

Output

Array: [Java, Python, C] List: [Java, Python, C]

In the above example, we have created an array of String type. Notice the expression,

Arrays.asList[array]

Here, the asList[] method of the Arrays class converts the specified array into a list.