Example 1: Convert list to array

1. import java.util.ArrayList;
2. import java.util.Arrays;
3. import java.util.List;
5. public class ListArray {
7. public static void main(String[] args) {
9. List<String> list = new ArrayList<String>();
10. list.add("a");
11. list.add("b");
13. String[] array = new String[list.size()];
14. list.toArray(array);
16. System.out.println(Arrays.toString(array));
18. }
19. }

When you run the program, the output will be:

[a, b]

In the above program, we’ve an list of strings list. To convert the list to an array, first we created a string array named array with size equals to list.size().

Then, we simply used list’s toArray() method to convert the list items to array items.

Example 2: Convert Array to list

1. import java.util.Arrays;
2. import java.util.List;
4. public class ArrayToList {
6. public static void main(String[] args) {
8. String[] array = {"a", "b"};
9. List<String> list = Arrays.asList(array);
11. System.out.println(list);
13. }
14. }

When you run the program, the output will be:

[a, b]

In the above program, we’ve an array of strings array. To convert the array to a list, we used Arrays‘s asList() method and stored it in the list, list.