Question

Exercise #1:

Create an abstract class called GameTester. The GameTester class includes a name for the game tester and a boolean value representing the status (full-time, part-time).

Include an abstract method to determine the salary, with full-time game testers getting a base salary of $3000 and part-time game testers getting $20 per hour.

Create two subclasses called FullTimeGameTester, PartTimeGameTester. Create a console application that demonstrates how to create objects of both subclasses. Allow the user to choose game tester type and enter the number of hours for the part-time testers.

                                                                                                                                   

Exercise #2:

CityToronto bank provides mortgages for individuals and businesses up to $300,000. Write a Java application that keeps track of mortgages and computes the total amount owed at any time (mortgage amount + interest).

Design the following classes to implement your application:

Mortgage – an abstract class that implements the MortgageConstants interface. A Mortgage includes a mortgage number, customer name, amount of mortgage, interest rate, and term.

Don’t allow mortgage amounts over $300,000. Force any mortgage term that is not defined in the MortgageConstants interface to a short-term, one year loan. Create a getMortgageInfo method to display all the mortgage data.

MortgageConstants – includes constant values for short-term (one year), medium-term (three years) and long-term (5 years) mortgages. It also contains constants for bank name and the maximum mortgage amount.

BusinessMortgage – extends Mortgage. Its constructor sets the interest rate to 1% over the current prime rate.

PersonalMortgage - extends Mortgage. Its constructor sets the interest rate to 2% over the current prime rate.

ProcessMortgage – a main class that create an array of 3 mortgages. Prompt the user for the current interest rate. Then in a loop prompts the user for a mortgage type and all relevant information for that mortgage. Store the created Mortgage objects in the array. When data entry is complete, display all mortgages.

Answer 1

1.

// GameTester.java

abstract public class GameTester
{
   private String name; // name of the tester
   private boolean fullTime; // value representing the status (full-time, part-time)
  
   // constructor to set the name and status of the tester
   public GameTester(String name, boolean fullTime)
   {
       this.name = name;
       this.fullTime = fullTime;
   }
  
   // abstract method to return the salary
   public abstract int salary();
}

//end of GameTester.java

// FullTimeGameTester.java

public class FullTimeGameTester extends GameTester
{
   // constructor to set name and status
   public FullTimeGameTester(String name)
   {
       super(name, true); // call GameTester's constructor with name and status as true for fullTime
   }
  
   // method to return the salary for full time tester
   public int salary()
   {
       return 3000 ;
   }
}

// end of FullTimeGameTester.java

// PartTimeGameTester.java

public class PartTimeGameTester extends GameTester
{
   // field for part time tester
   private int hours;
  
   // constructor to set the name, status and hours
   public PartTimeGameTester(String name, int hours)
   {
       super(name, false); // call GameTester's constructor with name and status as false for fullTime
       this.hours = hours; // set hours worked
   }
  
   // method to return the salary for part time tester
   public int salary()
   {
       return hours*20; // part time tester are getting $20 per hour
   }
}

// end of PartTimeGameTester.java

// GameTesterDriver.java

import java.util.Scanner;

public class GameTesterDriver {

   public static void main(String[] args) {

       int choice;
       int hours;
       String name;
       GameTester tester;
      
       Scanner keyboard = new Scanner(System.in);
       // input name of the tester
       System.out.print("Enter name: ");
       name = keyboard.nextLine();
       // input the type of tester
       System.out.println("1. FullTimeGameTester\n2. PartTimeGameTester: ");
       System.out.print("Enter your choice(1/2): ");
       choice = keyboard.nextInt();
      
       // part time tester, input number of hours
       if(choice == 2)
       {
           System.out.print("Enter number of hours: ");
           hours = keyboard.nextInt();
           tester = new PartTimeGameTester(name, hours); // create a part time tester
       }else
           tester = new FullTimeGameTester(name); // create a full time tester
       System.out.println("Salary: $"+tester.salary()); // display salary
   }

}

// end of GameTesterDriver.java

Output: