Java program to swap two numbers.

Question:

How can you swap two numbers in java?

Answer:

Swapping using temporary or third variable.

Code:

import java.util.Scanner;
 
public class Swap {
   public static void main(String[] args) {
 
      Scanner sc = new Scanner(System.in);
 
      System.out.print("Enter first int: ");
      int i1 = sc.nextInt();
 
      System.out.print("Enter first int: ");
      int i2 = sc.nextInt();
 
      System.out.println("Value #1 " + i1);
      System.out.println("Value #2 " + i2);
 
      System.out.println("Swapping...");
 
      int temp = i1;
      i1 = i2;
      i2 = temp;
 
      System.out.println("Value #1 " + i1);
      System.out.println("Value #2 " + i2);
 
   }
}

Output:

$ java Swap
Enter first int: 1
Enter first int: 4
Value #1 1
Value #2 4
Swapping...
Value #1 4
Value #2 1