A. Create an application named NumbersDemo whose main() method holds two integer variables. Assign values to the variables. In turn, pass each value to methods named displayTwiceTheNumber(), displayNumberPlusFive(), and displayNumberSquared(). Create each method to perform the task its name implies. Save the application as NumbersDemo. java. b. Modify the NumbersDemo class to accept the values of the two integers from a user at the keyboard. Save the file as NumbersDem02.java.

PART ONE:

public class NumbersDemo {

   public static void main(String[] args) {

   int num1= 1;

   int num2= 2;

   //Calling method displayTwiceTheNumber()

   displayTwiceTheNumber(num1);

   displayTwiceTheNumber(num2);

   //Calling method displayNumberPlusFive()

   displayNumberPlusFive(num1);

   displayNumberPlusFive(num2);

   //Calling method displayNumberSquared()

   displayNumberSquared(num1);

   displayNumberSquared(num2);

   }

   public static void displayTwiceTheNumber(int num1){

       System.out.println(num1*2);

   }

   public static void displayNumberPlusFive(int num1){

       System.out.println(num1+5);

   }

   public static void displayNumberSquared(int num1){

       System.out.println(num1*num1);

   }

}

PART TWO

import java.util.Scanner;

public class NumbersDem02 {

   public static void main(String[] args) {

       Scanner in = new Scanner(System.in);

       System.out.println("Enter Values for num1 and num2");

   int num1= in.nextInt();

   int num2= in.nextInt();

   //Calling method displayTwiceTheNumber()

   displayTwiceTheNumber(num1);

   displayTwiceTheNumber(num2);

   //Calling method displayNumberPlusFive()

   displayNumberPlusFive(num1);

   displayNumberPlusFive(num2);

   //Calling method displayNumberSquared()

   displayNumberSquared(num1);

   displayNumberSquared(num2);

   }

   public static void displayTwiceTheNumber(int num1){

       System.out.println(num1*2);

   }

   public static void displayNumberPlusFive(int num1){

       System.out.println(num1+5);

   }

   public static void displayNumberSquared(int num1){

       System.out.println(num1*num1);

   }

}

Explanation:

Three methods are created to do exactly as required by the question

In part two, the scanner class is used to receive the values from the user