Swap two numbers without using third variable

Example:
Before Swap
number1=45 number2=33

After Swap
number1=33 number2=45



class Swap {
public static void main(String[] args) {
int number1=45,number2=33;
number1 = number1 + number2;
number2 = number1 - number2;
number1 = number1 - number2;
System.out.println("After swapping, number1= " + number1 + " and number2= "
+ number2);
}
}