Creative 7 Ways to Swap Two Numbers in Java with Explanations

7 Creative Ways to Swap Two Numbers in Java

1) Using a Temporary Variable:

package com.thetechnicaltalk; public class SwappingTwoNumbers { public static void main(String[] args) { int a = 10; int b = 20; System.out.println("Before swapping values are..." + a + " " + b); int temp = a; a = b; b = temp; System.out.println("After swapping values are..." + a + " " + b); } }

2) Using Arithmetic Operations:

package com.thetechnicaltalk; public class SwappingTwoNumbers { public static void main(String[] args) { int a = 5; int b = 10; System.out.println("Before swapping values are..." + a + " " + b); a = a + b; b = a - b; a = a - b; System.out.println("After swapping values are..." + a + " " + b); } }

3) Using Bitwise XOR:

package com.thetechnicaltalk; public class SwappingTwoNumbers { public static void main(String[] args) { int a = 5; int b = 10; System.out.println("Before swapping values are..." + a + " " + b); a = a ^ b; b = a ^ b; a = a ^ b; System.out.println("After swapping values are..." + a + " " + b); } }

4) Using Multiplication and Division:

package com.thetechnicaltalk; public class SwappingTwoNumbers { public static void main(String[] args) { int a = 5; int b = 10; System.out.println("Before swapping values are..." + a + " " + b); a = a * b; b = a / b; a = a / b; System.out.println("After swapping values are..." + a + " " + b); } }

5) Using a Single Line:

package com.thetechnicaltalk; public class SwappingTwoNumbers { public static void main(String[] args) { int a = 5; int b = 10; System.out.println("Before swapping values are..." + a + " " + b); b = a + b - (a = b); System.out.println("After swapping values are..." + a + " " + b); } }

6) Using a Custom Swap Function:

package com.thetechnicaltalk; public class SwappingTwoNumbers { public static void main(String[] args) { int a = 5; int b = 10; System.out.println("Before swapping values are..." + a + " " + b); swap(a, b); } public static void swap(int a, int b) { int temp = a; a = b; b = temp; System.out.println("After swapping values inside function are..." + a + " " + b); } }

7) Using Java's Collections.swap() Method:

package com.thetechnicaltalk; import java.util.Arrays; import java.util.Collections; import java.util.List; public class SwappingTwoNumbers { public static void main(String[] args) { Integer[] arr = {5, 10}; List<Integer> list = Arrays.asList(arr); System.out.println("Before swapping values are..." + list.get(0) + " " + list.get(1)); Collections.swap(list, 0, 1); System.out.println("After swapping values are..." + list.get(0) + " " + list.get(1)); } }

Conclusion

Swapping two numbers is a fundamental concept in programming, and Java offers several ways to achieve it. Whether you prefer using simple arithmetic, bitwise operations, or even Java's built-in methods, understanding these different techniques will enhance your problem-solving skills. Experiment with these methods in your projects, and you'll find that swapping numbers is both an interesting and valuable exercise in coding.

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