Java Programs

Share with a Friend

Introduction to Java

Swap Two Numbers Using Temp Variable - Java Program

public class SwapUsingTemp {
    public static void main(String[] args) {
       
        int a = 10;
        int b = 20;
 
        System.out.println("Before Swapping:");
        System.out.println("a = " + a);
        System.out.println("b = " + b);
 
        // Swapping using temp variable
        int temp = a;
        a = b;       
        b = temp;    
 
        System.out.println("\nAfter Swapping:");
        System.out.println("a = " + a);
        System.out.println("b = " + b);
    }
}
 

 
OUTPUT :
Before Swapping:
a = 10
b = 20

After Swapping:
a = 20
b = 10

Explanation (Step-by-Step)

 Step 1 — Initialize Variables

int a = 10;

int b = 20;

Two variables a and b are assigned values.

 Step 2 — Display Before Swap Values

Prints:

a = 10

b = 20

 Step 3 — Use Temp Variable

int temp = a;

temp stores the value of a.

Now:

• temp = 10
• a = 10
• b = 20

 Step 4 — Assign b to a

a = b;

Now:

• a = 20
• b = 20
• temp = 10

 Step 5 — Assign temp to b

b = temp;

Now:

• a = 20
• b = 10
• temp = 10

The values are successfully swapped.