Program to swap number without temporary variable

package javabox;

public class SwapExample {

public static void main(String a[]){
int x = 30;
int y = 40;
System.out.println("Before swap:");
System.out.println("x value: "+x);
System.out.println("y value: "+y);
x = x+y;
y = x-y;
x = x-y;
System.out.println("After swap:");
System.out.println("x value: "+x);
System.out.println("y value: "+y);
}
}

Output -
Before swap:
x value: 30
y value: 40
After swap:
x value: 40
y value: 30