java arraylist to array int code example

Example 1: integer arraylist to int array

//only works in java 8 or later
list.stream().mapToInt(i -> i).toArray();

Example 2: java arraylist to array

List<String> list = new ArrayList<>();
list.add("a");
list.add("ab");
list.add("abc");
list.add("abcd");
// convert
String[] array = list.toArray();

Example 3: convert array of int to arraylist java

int[] ints = {1, 2, 3};
List<Integer> intList = new ArrayList<Integer>(ints.length);
for (int i : ints)
{
    intList.add(i);
}

Example 4: convert Integer arraylist to array java

Your_ArrayList_Name.stream().mapToInt(k->k).toArray();

Example 5: convert arraylist of integers to array primitive

list.stream().mapToInt(i -> i).toArray();