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 list of integer to array in java
List<Integer> al = new ArrayList<Integer>();
Integer[] arr = new Integer[al.size()];
arr = al.toArray(arr);
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