java program swap of 2 variables without using third code example

Example 1: swap three variables in java without using temporary variable

// swap three variables in java without using temporary variable
public class SwapThreeNumbersWithoutTemp
{
   static int num1, num2, num3;
   public static void main(String[] args) 
   {
      num1 = 30; num2 = 60; num3 = 90; 
      System.out.println("Before swapping three numbers: num1 = " + num1 + ", num2 = " + num2 + ", num3 = " + num3);
      swapWithoutTemporary();
      System.out.println("After swapping three numbers: num1 = " + num1 + ", num2 = " + num2 + ", num3 = " + num3);
   }
   static void swapWithoutTemporary() 
   { 
      num1 = num1 + num2 + num3; 
      num2 = num1 - (num2 + num3); 
      num3 = num1 - (num2 + num3); 
      num1 = num1 - (num2 + num3);  
   }
}

Example 2: swapping with two variables in java

public class Exercise15 {
  public static void main(String[] args) {
     // int, double, float
   int a, b;
   a = 15;
   b = 27;
   System.out.println("Before swapping : a, b = "+a+", "+ + b);
   a = a + b;
   b = a - b;
   a = a - b;
   System.out.println("After swapping : a, b = "+a+", "+ + b);
 }
 
}