Swap two numbers without using third variable

1. Java Interview Program to Swap two numbers without using third variable in java

1. package com.instaceofjava;
2.  
3. public class SwapTwoNumbers {
4.  
5. public static void main(String[] args) {
6.  
7. int number1=20;
8. int number2=30;
9.  
10. System.out.println("Before Swapping");
11. System.out.println("Value of number1 is :" + number1);
12. System.out.println("Value of number2 is :" +number2); 
13.  
14. number1=number1+number2;
15. number2=number1-number2;
16. number1=number1-number2;
17.  
18. System.out.println("After Swapping");
19. System.out.println("Value of number1 is :" + number1);
20. System.out.println("Value of number2 is :" +number2);
21.  
22. }
23. }

Output:

1. Before Swapping
2. Value of number1 is :20
3. Value of number2 is :30
4. After Swapping
5. Value of number1 is :30
6. Value of number2 is :20

2. Java Program to Swap two numbers by using division and multiplication.

1. package com.instaceofjava;
2.  
3. public class SwapTwoNumbers {
4.  
5. public static void main(String[] args) {
6.  
7. int number1=20;
8. int number2=30;
9.  
10. System.out.println("Before Swapping");
11. System.out.println("Value of number1 is :" + number1);
12. System.out.println("Value of number2 is :" +number2); 
13.  
14. number1=number1*number2;
15. number2=number1/number2;
16. number1=number1/number2;
17.  
18. System.out.println("After Swapping");
19. System.out.println("Value of number1 is :" + number1);
20. System.out.println("Value of number2 is :" +number2);
21.  
22. }
23. }

Output:

1. Before Swapping
2. Value of number1 is :20
3. Value of number2 is :30
4. After Swapping
5. Value of number1 is :30
6. Value of number2 is :20

3. Java Program to Swap two integers by using bit wise operators

1. package com.instaceofjava;
2.  
3. public class SwapTwoNumbers {
4.  
5. public static void main(String[] args) {
6.  
7. int number1=2;
8. int number2=4;
9.  
10. System.out.println("Before Swapping");
11. System.out.println("Value of number1 is :" + number1);
12. System.out.println("Value of number2 is :" +number2); 
13.  
14. number1=number1^number2;
15. number2=number1^number2;
16. number1=number1^number2;
17.  
18. System.out.println("After Swapping");
19. System.out.println("Value of number1 is :" + number1);
20. System.out.println("Value of number2 is :" +number2);
21.  
22. }
23. }

Output:

1. Before Swapping
2. Value of number1 is :2
3. Value of number2 is :4
4. After Swapping
5. Value of number1 is :4
6. Value of number2 is :2