a. Program code: NumbersDemo.java //define the method NumbersDemo public class NumbersDemo { //define the main() method public static void main(String args[]) { //create two integer variable int n1 = 10; int n2 = 7; //call the static methods displayTwiceTheNumber(n1); displayNumberPlusFive(n1); displayNumberSquared(n1); //print new line System.out.println(); //call the static methods displayTwiceTheNumber(n2); displayNumberPlusFive(n2); displayNumberSquared(n2); } //define the method displayTwiceTheNumber() public static void displayTwiceTheNumber(int n) { //multiply n by 2 and print it System.out.println(2 * n); } //define the method displayNumberPlusFive() public static void displayNumberPlusFive(int n) { //add 5 to n and dispaly it System...

Question

Create an application named SalesTransactiobDemo that declares several SalesTransaction objects and displays their values and their sum. Name - The salesperson name (as a string) sales Amount- The sales amount (as a double) commission- The commission (as a double) RATE- A readonly field that stores the commission rate (as a double). Define a getRate() avcessor method that returns the RATE Include 3 constructors for the class. One constructor accepts values for the name, sales amount, and rate, and when the sales value is set, the constructor computes the commission as sales value times commission rate. The second constructor accepts a name and sales amount, but sets the commission rate to 0 The third constructor accepts a name and sets all the other fields to 0

Answer 1

Expert Solution & Answer

Chapter 3, Problem 4PE

Explanation of Solution

a.

Program code:

NumbersDemo.java

//define the method NumbersDemo

public class NumbersDemo

{

    //define the main() method

    public static void main(String args[])

    {

        //create two integer variable

        int n1 = 10;

        int n2 = 7;

//call the static methods

displayTwiceTheNumber(n1);

displayNumberPlusFive(n1);

displayNumberSquared(n1);

        //print new line

        System.out.println();

//call the static methods

displayTwiceTheNumber(n2);

displayNumberPlusFive(n2);

displayNumberSquared(n2);

    }

//define the method displayTwiceTheNumber()

public static void displayTwiceTheNumber(int n)

{

    //multiply n by 2 and print it

    System.out.println(2 * n);

}

//define the method displayNumberPlusFive()

public static void displayNumberPlusFive(int n)

{

    //add 5 to n and dispaly it

    System...

Explanation of Solution

b.

Program code:

NumbersDemo2.java

//import the package

import java.util.Scanner;

//define the method NumbersDemo

public class NumbersDemo2

{

    //define the main() method

    public static void main(String args[])

    {

        //create the object of scanner

        Scanner in = new Scanner(System.in);

        //prompt the user to enter two numbers

        System.out.println("Enter the numbers");

        //scan for the values

        int n1 = in.nextInt();

        int n2 = in.nextInt();

        //print new line

        System.out.println();

//call the static methods

displayTwiceTheNumber(n1);

displayNumberPlusFive(n1);

displayNumberSquared(n1);

        //print new line

        System.out.println();

//call the static methods

displayTwiceTheNumber(n2);

displayNumberPlusFive(n2);

displayNumberSquared(n2);

    }

//define the method displayTwiceTheNumber()

public static void displayTwiceTheNumber(int n)

{

    //multiply n by 2 and print it

    System...

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