Java: How to Swap Two Members Without using Temp Variable

If you search for Java Interview Questions on Google then you will find this question most from top questions. In Java what are the best way to Swap Two Members Without using Temp Variable?

In this tutorial we will solve this problem by two different ways:

1. Using addition and subtraction method
2. Using multiplication and divide method

Here is a complete code:

package com.crunchify.tutorials;

/**
 * @author Crunchify.com
 */

public class CrunchifySwapVariables {

	public static void main(String[] args) {
		int a = 20;
		int b = 30;
		int c = 3;
		int d = 4;

		CrunchifySwapVariables.SwapVairablesMethod1(a, b);
		CrunchifySwapVariables.SwapVairablesMethod2(c, d);

	}

	public static void SwapVairablesMethod1(int a, int b){
		System.out.println("value of a and b before swapping, a: " + a +" b: " + b);

		//swapping value of two numbers without using temp variable
		a = a + b; //now a is 50 and b is 20
		b = a - b; //now a is 50 but b is 20 (original value of a)
		a = a - b; //now a is 30 and b is 20, numbers are swapped

		System.out.println("Result Method1 => a: " + a +" b: " + b);

	}

	public static void SwapVairablesMethod2(int c, int d){
		System.out.println("\nvalue of c and d before swapping, c: " + c +" d: " + d);

		//swapping value of two numbers without using temp variable using multiplication and division
		c = c*d; 
		d = c/d; 
		c = c/d; 

		System.out.println("Result Method2 => c: " + c +" d: " + d);

	}
}

Output:

value of a and b before swapping, a: 20 b: 30
Result Method1 => a: 30 b: 20

value of c and d before swapping, c: 3 d: 4
Result Method2 => c: 4 d: 3

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