convert 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: convert int array to integer list java

int[] arr = {1,2,3};
IntStream.of(arr).boxed().collect(Collectors.toList());

Example 3: convert arraylist to array int

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