How Do I Convert a Java List to an Array?

How to Convert a List to an Array in Java

To convert a List to an array in Java, you can use either of the following methods:

Foo[] array = list.toArray(new Foo[0]);

Foo[] array = new Foo[list.size()];
list.toArray(array);

These methods only work for arrays of reference types. For primitive type arrays, you must use the traditional approach:

List<Integer> list = ...;
int[] array = new int[list.size()];
for(int i = 0; i < list.size(); i++) array[i] = list.get(i);

Best Practice

It is recommended to use the first method, list.toArray(new Foo[0]), for converting lists to arrays. This eliminates the need to specify the size of the array in advance and is more efficient in modern Java.

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