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Java int array to Integer ArrayList

Integer arraylist to int array

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

7

Convert arraylist of integers to array primitive

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

0

Java int array to Integer ArrayList

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

-1

Source: stackoverflow.com

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