Solution : Move zeroes to last without maintaining relative order.

MoveZeroesWithOutOrder.java

public class MoveZeroesWithOutOrder {

    public static void main(String[] args) {
        int[] arr = {0, 1, 0, 3, 12};
        moveZeroes(arr);
        for (int num : arr) {
            System.out.print(num + " ");
        }
        System.out.println();
    }

    public static void moveZeroes(int[] nums) {
        int left = 0;
        int right = nums.length - 1;
        while (left < right) {
            if (nums[left] == 0 && nums[right] != 0) {
                swap(nums, left, right);
                left++;
                right--;
            } else {
                if (nums[left] != 0) {
                    left++;
                }
                if (nums[right] == 0) {
                    right--;
                }
            }
        }
    }
    
    public static void swap(int[] nums, int left, int right) {
        nums[left] = nums[left] + nums[right];
        nums[right] = nums[left] - nums[right];
        nums[left] = nums[left] - nums[right];
    }

}