Creating an Inheritance program in Java

Problem:

Create a class called Client that has the ID (int), First Name, Last Name (Strings), and amount(double) variables, and the AddMoney(), SubMoney() methods that are responsible respectively to add or subtract money to/from the amount.

Create a class called GoldenClient that inherits from the Client class, but have one more attribute which is char GoldenLevel that can be either ‘H’, ‘M’ or ‘L’. The GoldenLevel is set in method setGoldenLevel() method according to: ‘H’ if amount > 10000, ‘M’ if 5000 < amount < 10000, and ‘L’ if amount < 1000.

Create a class called PlatinumClient that inherits from the Client class, but have two more attributes: int numberOfTrips and double TravelOffersRate. It also has a method called addTrips(int n) that adds n trips to numberOfTrips. TravelOffersRate is calculated according to the formula: numberOfTrips*0.01. Make sure to update the value of TravelOffersRate when addTrips(int n) method adds trips to numberOfTrips.

Make sure to declare all Client’s variables as protected to allow inheritance.

Make sure to include the set, get and toString() methods in all classes. A toString() method will print the variable names and their corresponding values.

At the end, create the main class that contains the main method, create a new user and do some transactions.

Output:

Not needed.

Solution:

/**----------------------------Client.java--------------------*/
public class Client {
 
 protected int id;
 protected String firstName;
 protected String lastName;
 protected double amount;
 
 public Client(int id, String firstName, String lastName, 
                                                double amount) {
  this.id = id;
  this.firstName = firstName;
  this.lastName = lastName;
  this.amount = amount;
 }

 public int getId() {
  return id;
 }

 public void setId(int id) {
  this.id = id;
 }

 public String getFirstName() {
  return firstName;
 }

 public void setFirstName(String firstName) {
  this.firstName = firstName;
 }

 public String getLastName() {
  return lastName;
 }

 public void setLastName(String lastName) {
  this.lastName = lastName;
 }

 public double getAmount() {
  return amount;
 }

 public void setAmount(double amount) {
  this.amount = amount;
 }
 
 public void addMoney(int toAdd) {
  amount += toAdd;
 }
 
 public void subMoney(int toSub) {
  amount -= toSub;
 }
 
 public String toString() {
  return "ID: "+id+"\nName: "+firstName+" "+
                          lastName+"\nAmount: "+amount+"\n";
 }
}
/**-----------------------ClientTest.java-----------------*/
public class ClientTest {
 
 public static void main(String args[]) {
  Client client = new Client(1, "Jon", "Snow", 10);
  GoldenClient goldenClient = new GoldenClient(2,
                                   "Jaime", "Lannister", 20000);
  PlatinumClient platClient = new PlatinumClient(5,
                                    "Arya", "Stark", 10000, 50);
  
  System.out.println(client);
  System.out.println(goldenClient);
  System.out.println(platClient);
  
  client.addMoney(1000000);
  client.subMoney(50000);
  
  goldenClient.subMoney(13000);
  goldenClient.setGoldenLevel();
  
  platClient.addTrips(10);
  
  System.out.println(client);
  System.out.println(goldenClient);
  System.out.println(platClient);
 }
}
/**-------------------GoldenClient.java-----------------*/
public class GoldenClient extends Client {

 private char goldenLevel;
 
 public GoldenClient(int id, String firstName, 
                          String lastName, double amount) {
  super(id, firstName, lastName, amount);
  setGoldenLevel();
 }
 
 public void setGoldenLevel() {
  if (amount > 10000)
   goldenLevel = 'H';
  else if (amount < 10000 && amount > 5000)
   goldenLevel = 'M';
  else if (amount < 1000)
   goldenLevel = 'L';
 }
 
 public char getGoldenLevel() {
  return goldenLevel;
 }
 
 public String toString() {
  return super.toString() + "Golden Level: "+
                                        goldenLevel+"\n";
 }
}
/**------------------PlatinumClient.java--------------*/
public class PlatinumClient extends Client {

 private int numberOfTrips;
 private double travelOffersRate;
 
 public PlatinumClient(int id, String firstName, 
     String lastName, double amount, int numberOfTrips) {
  super(id, firstName, lastName, amount);
  setNumberOfTrips(numberOfTrips);
 }

 public int getNumberOfTrips() {
  return numberOfTrips;
 }

 public void setNumberOfTrips(int numberOfTrips) {
  this.numberOfTrips = numberOfTrips;
  setTravelOffersRate(numberOfTrips*0.01);
 }

 public double getTravelOffersRate() {
  return travelOffersRate;
 }

 public void setTravelOffersRate(double travelOffersRate) {
  this.travelOffersRate = travelOffersRate;
 }

 public void addTrips(int n) {
  numberOfTrips += n;
  travelOffersRate = numberOfTrips*0.01;
 }
 
 public String toString() {
  return super.toString() + "Number of Trips: "+
         numberOfTrips+"\nTravel Offers Rate: "+travelOffersRate+"\n";
 }
}