Question

3. Java: Write a Java method to swap two integers. Attach your code as well as a test run screenshot.

Answer 1

• Getting the values from the user and then do the swapping of values (Dynamically):

======================= Swap.java ====================================

CODE:

 import java.util.Scanner;  // Import the Scanner class

public class Swap
{
    static int First_Number;    //for store the first integer value from the user
    static int Second_Number;    //for store the  second integer value from the user
 
    public static void main(String args[])
    {

          Scanner myObj = new Scanner(System.in);  // Create a Scanner object
        
        System.out.print("Enter First Integer value:-");
        First_Number = myObj.nextInt();  // Read user input
        
        System.out.print("Enter Second Integer value:-");
        Second_Number = myObj.nextInt();  // Read user input

        System.out.println("\n Before swap");
        System.out.println("First Integer Value is: " + First_Number);
        System.out.println("Second Integer Value is: " + Second_Number);

        //Function call
        swap(First_Number,Second_Number);
    }  


    //Function Declaration
    public static void swap(int first,int second)
    {
        //Changing the variable Values
        First_Number = second;
        Second_Number = first;

        //Printing the value
        System.out.println("\n After swap");
        System.out.println("First Integer Value is: " + First_Number);
        System.out.println("Second Integer Value is: " + Second_Number);
    }
}

OUTPUT:

Activities Terminal Mar 12 1:09 PM jignesh@Jignesh: -/Desktop jignesh@Jignesh:-/Desktop$ java Swap.java Enter First Integer value:-10 Enter Second Integer value: -30 Before swap First Integer Value is: 10 Second Integer Value is: 30 After swap First Integer Value is: 30 Second Integer Value is: 10 jignesh@Jignesh:-/Desktops java Swap.java Enter First Integer value: -88 Enter Second Integer value: -35 Before swap First Integer Value is: 88 Second Integer Value is: 35 After swap First Integer Value is: 35 Second Integer Value is: 88_ jignesh@Jignesh:-/Desktops |||

• Swapping static values:

============================Main.java ===============================

CODE:

 public class Main
{
    static int First_Number;    
    static int Second_Number;    
    
    public static void main(String args[])
    {
        First_Number = 10;
        Second_Number = 20;

        System.out.println("\n Before swap");
        System.out.println("First Integer Value is: " + First_Number);
        System.out.println("Second Integer Value is: " + Second_Number);

        swap(First_Number,Second_Number);


        First_Number = 15;
        Second_Number = 25;

        System.out.println("\n Before swap");
        System.out.println("First Integer Value is: " + First_Number);
        System.out.println("Second Integer Value is: " + Second_Number);

        swap(First_Number,Second_Number);
    }  

    public static void swap(int first,int second)
    {
        First_Number = second;
        Second_Number = first;

        System.out.println(" \n After swap");
        System.out.println("First Integer Value is: " + First_Number);
        System.out.println("Second Integer Value is: " + Second_Number);
    }
}

OUTPUT:

Activities Terminal Mar 12 1:15 PM jignesh@Jignesh: -/Desktop jignesh@Jignesh:-/Desktop$ java Main.java Before swap First Integer Value is: 10 Second Integer Value is: 20 After swap First Integer Value is: 20 Second Integer Value is: 10 Before swap First Integer Value is: 15 Second Integer Value is: 25 After swap First Integer Value is: 25 Second Integer Value is: 15_ jignesh@Jignesh:-/Desktops U

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