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How to convert an Array to a List in Java Program?
An array can be converted to a List easily using multiple ways.
Way #1
Create an empty list. Iterate through array and add each item to list using its add method.
for (int i = 0; i < array.length; i++) {
list.add(array[i]);
}Way #2
Use Arrays.asList() method to get a list from an array.
List<Integer> list = Arrays.asList(array);
Way #3
Use Collections.addAll() method to add elements of array to the list.
Collections.addAll(list, array);
Way #4
Use Streams to collect all elements of an array into the list.
List<Integer> list = Arrays.stream(array).collect(Collectors.toList());
Example
Following is the example showing the various methods to get a list from an array −
package com.tutorialspoint;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;
public class CollectionsDemo {
public static void main(String[] args) {
Integer[] array = {1, 2, 3, 4, 5, 6};
List<Integer> list = new ArrayList<>();
for (int i = 0; i < array.length; i++) {
list.add(array[i]);
}
System.out.println(list);
List<Integer> list1 = Arrays.asList(array);
System.out.println(list1);
List<Integer> list2 = new ArrayList<>();
Collections.addAll(list2, array);
System.out.println(list2);
List<Integer> list3 = Arrays.stream(array).collect(Collectors.toList());
System.out.println(list3);
}
}Output
This will produce the following result −
[1, 2, 3, 4, 5, 6] [1, 2, 3, 4, 5, 6] [1, 2, 3, 4, 5, 6] [1, 2, 3, 4, 5, 6]
Updated on: 10-May-2022
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