java swap variables

1public static void swap(int[] a, int i, int j){
2	int temp = a[i];
3  	a[i] = a[j];
4  	a[j] = temp;
5}

1public class Exercise15 {
2  public static void main(String[] args) {
3     // int, double, float
4   int a, b;
5   a = 15;
6   b = 27;
7   System.out.println("Before swapping : a, b = "+a+", "+ + b);
8   a = a + b;
9   b = a - b;
10   a = a - b;
11   System.out.println("After swapping : a, b = "+a+", "+ + b);
12 }
13 
14}
15
16

1// a, b can be a numeric value
2a += b; // a = a + b
3b = a - b; // b = (a + b) - b = a  ---> b=a
4a -= b; // a = (a + b) - (a) = b  ---> a=b