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Java Program To Swap Two Numbers | 5 Ways To Swap The Numbers

Swap 2 Numbers | 5 Ways To Swap Two Numbers In Java

Way -1
==========

public class swap2Numbers
{
     public static void main(String[] args) {
        int a = 10, b =20;
        System.out.println("Before Swapping:" + a + "..." + b);

        // using third variable approach
        int temp =a;
        a=b;
        b=temp;
        System.out.println("After swapping:" + a +"..." + b);

     }

}

Way -2
============

public class swap2Numbers2 {

    // without using third variable approach

    public static void main(String[] args) {
        int a = 10, b = 20;
        System.out.println("Before Swapping:" + a + "..." + b);
        a = a + b;
        b = a - b;
        a = a - b;

        System.out.println("After Swapping:" + a + "..." + b);

    }

}

Way -3
============

public class swap2Numbers3 {

    // using multiplication and division operator approach
    public static void main(String[] args) {

        int a = 10, b = 20;

        System.out.println("Before Swapping:" + a + "..." + b);
        a = a * b;
        b = a / b;
        a = a / b;

        System.out.println("After Swapping:" + a + "..." + b);

    }

}

Way -4
================

public class swap2Numbers4 {

    public static void main(String[] args) {

        // using Bit-wise X-OR operator
        int a = 10 // Binary Representation 1010, b = 20 // Binary Representation 10100;
        /*
         *  a^b
         *    01010
         *   ^10100
         * =============
         *    11110
         * Like this way,
         *
         */
        System.out.println("Before Swapping:" + a + "..." + b);
        a = a ^ b;
        b = a ^ b;
        a = a ^ b;

        System.out.println("After Swapping:" + a + "..." + b);

    }

}

Way -5
==============

public class swap2Numbers5 {

    public static void main(String[] args) {
        int a = 10, b = 20;
        // with single statement approach
        System.out.println("Before Swapping:" + a + "..." + b);
        b = a + b - (a = b);
        // This expression execution starts from Right to left
        System.out.println("After swapping:" + a + "..." + b);

    }

}

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