integer arraylist to int array
//only works in java 8 or later
list.stream().mapToInt(i -> i).toArray();
integer arraylist to int array
//only works in java 8 or later
list.stream().mapToInt(i -> i).toArray();
list to int array in java 8
int[] array = list.stream().mapToInt(i->i).toArray();
convert int array to integer list java
int[] arr = {1,2,3};
IntStream.of(arr).boxed().collect(Collectors.toList());
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);
}
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