Can we convert Java array to list?

We can easily convert Java Array to List using Arrays.asList() method.

Syntax

public static  List asList(T... a)

Returns a fixed-size list backed by the specified array. (Changes to the returned list are "written" to the array.) This method is used in conjunction with Collection.toArray() to act as a bridge between array-based and collection-based APIs. The returned list is serializable and implements RandomAccess.

Type parameters

• T- The runtime type of

Parameters

• a- Array lists will be supported.

Returns a list view of the

specified array.

Example

The following example demonstrates how to use the Arrays.asList() method to obtain immutable and mutable lists.

package com.tutorialspoint; import java.util.ArrayList; import java.util.Arrays; import java.util.List; public class CollectionsDemo { public static void main(String[] args) { Integer[] array = {1,2,3,4,5,6}; // Get a mutable list from array List list = new ArrayList<>(Arrays.asList(array)); list.add(7); System.out.println("List: " + list); // Get immutable list from array List list1 = Arrays.asList(array); try { list1.add(7); } catch(Exception e) { e.printStackTrace(); } System.out.println("List: " + list1); } }

Output

This will produce the following results -

List: [1, 2, 3, 4, 5, 6, 7] List: [1, 2, 3, 4, 5, 6] java.lang.UnsupportedOperationException at java.util.AbstractList.add(AbstractList.java:148) at java.util.AbstractList.add(AbstractList.java:108) at com.tutorialspoint.CollectionsDemo.main(CollectionsDemo.java:19)

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