SwapWithoutExtraSpace.java

public class SwapWithoutExtraSpace {
    static void swap(int[] nums, int i, int j) {
        nums[i] = nums[i] ^ nums[j];
        nums[j] = nums[i] ^ nums[j];
        nums[i] = nums[i] ^ nums[j];
    }

    static void printArray(int[] nums) {
        for (int i = 0; i < nums.length; i++) {
            if (i != 0) { System.out.print(" "); }
            System.out.print(nums[i]);
        }
        System.out.println();
    }

    public static void main(String[] args) {
        int[] nums = {1, 2, 3, 4, 5};
        swap(nums, 0, nums.length - 1);
        printArray(nums);
    }
}