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();
java int to int array
int number = 110101;
String temp = Integer.toString(number);
int[] numbers = new int[temp.length()];
for (int i = 0; i < temp.length(); i++) {
numbers[i] = temp.charAt(i) - '0';
}
convert int array to integer list java
int[] arr = {1,2,3};
IntStream.of(arr).boxed().collect(Collectors.toList());
convert list of integer to array in java
List<Integer> al = new ArrayList<Integer>();
Integer[] arr = new Integer[al.size()];
arr = al.toArray(arr);
List of Integer to int array
int [] ints = list.stream().mapToInt(Integer::intValue).toArray();
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