Java Swap of two data with out third variable Code

To swap two variables in Java without using a third variable, you can use arithmetic operations or bitwise XOR. Here’s how you can do it:

Using Arithmetic Operations

java

public class SwapWithoutThirdVariable {

public static void main(String[] args) {

int a = 30;

int b = 40;

System.out.println("Before Swap: a = " + a + ", b = " + b);

// Swap using arithmetic operations

a = a + b; // a now holds the sum of a and b

b = a - b; // b now holds the original value of a

a = a - b; // a now holds the original value of b

System.out.println("After Swap: a = " + a + ", b = " + b);

}

Using Bitwise XOR

java

public class SwapWithoutThirdVariable {

public static void main(String[] args) {

int a = 30;

int b = 40;

System.out.println("Before Swap: a = " + a + ", b = " + b);

// Swap using bitwise XOR

a = a ^ b; // a now holds the result of a XOR b

b = a ^ b; // b now holds the original value of a

a = a ^ b; // a now holds the original value of b

System.out.println("After Swap: a = " + a + ", b = " + b);

}

Explanation

Arithmetic Operations:

a = a + b: Adds the values of a and b and stores the result in a.
b = a - b: Subtracts b from the new value of a (which is a + b), giving the original value of a.
a = a - b: Subtracts the new value of b (which is the original value of a) from a (which is a + b), giving the original value of b.

Bitwise XOR:

a = a ^ b: Computes the XOR of a and b and stores it in a.
b = a ^ b: XORs the new value of a (which is a ^ b) with b, yielding the original value of a.
a = a ^ b: XORs the new value of a (which is a ^ b) with the new value of b (which is the original value of a), yielding the original value of b.

Ex-plain:

A B A^B (A XOR B)

0 0 0 (zero because operands are same)

0 1 1

1 0 1 (one because operands are different)

1 1 0

Both methods achieve the swap without using a temporary variable. The XOR method is more elegant and avoids potential issues with integer overflow, but the arithmetic method is often easier to understand.