Question

Please use Java

Question 3:

Person and Customer classes:

Design a class named Person with properties for holding a person's name, address, and telephone number. Next, design a class named Customer, which is derived from the Person class. The Customer class should have a property for a customer number and a Boolean property indicating whether wishes to be on a mailing list. Demonstrate an object of customer class in a simple GUI application.

• Write the code include appropriate input validation, error and exception handling code.

A retail store has a preferred customer plan where customers can earn discounts on all their purchases. The amount of discount depends on customer's cumulative purchases in the store and the business rules for discounts is as follows:

• When a preferred customer spends $500, he or she gets a 5 % discount on all future purchases.

• When a preferred customer spends $1000, he or she gets a 6 % discount on all future purchases.

• When a preferred customer spends $1500, he or she gets a 7 % discount on all future purchases.

• When a preferred customer spends $2000, he or she gets a 10 % discount on all future purchases.

Design a class called PreferredCustomer, which is derived from the Customer class you created in No 3.

The PreferredCustomer class should have properties for the amount of the customer's purchases and the customer's discount level. Demonstrate the class in a simple GUI application.

• Write the code include appropriate input validation, error and exception handling code.

Answer 1

//////////////////////////

public class Person {
private String name;// store name
private String address;// store address
private long telephoneNo; // store telephone number
  
// constructor
public Person(){
  
// initialize
this.name="";
this.address="";
this.telephoneNo=0;
}
  
// setter , if error on catting return false , otherwise true
public boolean setName(String a){
try{
this.name=a;
return(true);
}
catch(Exception e){
return(false);
}
}
public boolean setAddress(String a){
try{
this.address=a;
return(true);
}
catch(Exception e){
return(false);
}
}
  
  
public boolean setTelephoneNo(String a){
try{
this.telephoneNo=Long.parseLong(a);
return(true);
}
catch(Exception e){
return(false);
}
  
}
  
// getter
public String getName(){return(this.name);}
public String getAddress(){return(this.address);}
public long getTelephoneNo(){return(this.telephoneNo);}
  
  
// to string method
public String toString(){
String ret="";
ret+="\nName : "+this.name;
ret+="\nAddress : "+this.address;
ret+="\nTelephone Number : "+this.telephoneNo;
return(ret);
}
}

/////////////////////////////

public class Customer extends Person{
private String custNo;// store customer id
private boolean toBeMailLst;// to be list in mail
  
  
// constructor
public Customer(){
  
// call base class
super();
  
// initialize
this.custNo="";
this.toBeMailLst=false;
}
  
// setter , if error on catting return false , otherwise true
public boolean setCustNo(String a){
try{
this.custNo=a;
return(true);
}
catch(Exception e){
return(false);
}
}
  
public boolean setToBeMailLst(String a){
if(a.toUpperCase().equals("TRUE")){
this.toBeMailLst=true;
return(true);
}
else{
if(a.toUpperCase().equals("FALSE")){
this.toBeMailLst=false;
return(true);
}
else{
return(false);
}
}
}
  
public String getCustNo(){return(this.custNo);}
public Boolean sgetToBeMailLst(){return(this.toBeMailLst);}
  
  
// to string method
public String toString(){
String ret="";
ret+="\nCustomer Number : "+this.custNo;
ret+="\nTo be on a mailing list : ";
  
if(this.toBeMailLst==true){
ret+="Yes";
}
else{
ret+="No";
}
ret+=super.toString();
return(ret);
}
  
}

////////////////////////////////

public class PreferredCustomer extends Customer{
private double amount;// store amount
private double discountLvl;// store discount
  
// constructor
public PreferredCustomer(){
  
// call base class
super();
  
// initialize
this.amount=0;
this.discountLvl=0;
}
  
// setter , if error on catting return false , otherwise true
public boolean setAmount(String d){
try{
this.amount=Double.parseDouble(d);
  
// set discount amount
if(this.amount>=500.0){
this.discountLvl=5;
}
if(this.amount>=1000.0){
this.discountLvl=5;
}
if(this.amount>=1500.0){
this.discountLvl=7;
}
if(this.amount>=2000.0){
this.discountLvl=10;
}
  
return(true);
}
catch(Exception e){
return(false);
}
  
}

// getter
public double getAmount(){
return(this.amount);
}
public double getDiscount(){
return(this.discountLvl);
}
  
// to string method
public String toString(){
String ret="";
ret+="\nAmount $"+this.amount;
ret+="\nDiscount "+this.discountLvl+"%";
ret+=super.toString();
return(ret);
}
}

///////////////////////////////////////////////

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class Custgui extends Application {
  
@Override
public void start(Stage primaryStage) {
  

Label lbl1 = new Label("\tName");
Label lbl2 = new Label("\tAddress");
Label lbl3 = new Label("\tTelephone Number");
Label lbl4 = new Label("\tCustomer Number");
Label lbl5 = new Label("\tTo be add in mail list");
  
TextField text1 = new TextField();
TextField text2 = new TextField();
TextField text3 = new TextField();
TextField text4 = new TextField();
TextField text5 = new TextField();
  
Button btn = new Button();
btn.setText("Check Class");
btn.setOnAction(new EventHandler<ActionEvent>() {
private Object MessageBox;
private Object Dialogs;
  
@Override
public void handle(ActionEvent event) {
PreferredCustomer pc=new PreferredCustomer();
boolean b1=pc.setName(text1.getText());
boolean b2=pc.setAddress(text2.getText());
boolean b3=pc.setTelephoneNo(text3.getText());
boolean b4=pc.setCustNo(text4.getText());
boolean b5=pc.setToBeMailLst(text5.getText());
Alert al=new Alert(Alert.AlertType.INFORMATION);
  
if(b1 && b2 && b3 && b4 && b5){
  
al.setTitle("Object Data");
al.setContentText(pc.toString());
al.show();
}
else{
String s="";
if(b1==false){
s+="\nError in Name";
}
if(b2==false){
s+="\nError in Address";
}
if(b3==false){
s+="\nError in Telephone Number";
}
if(b4==false){
s+="\nError in Customer Number";
}
if(b5==false){
s+="\nError , Write [ true or false ] ";
}

al.setTitle("Error On Data");
al.setContentText(s);
al.show();
}
  
}
});
  
GridPane gridPane = new GridPane();

gridPane.setHgap(10);
gridPane.setVgap(10);
  
  
gridPane.add(lbl1, 0, 0, 1, 1);
gridPane.add(lbl2, 0, 1, 1, 1);
gridPane.add(lbl3, 0, 2, 1, 1);
gridPane.add(lbl4, 0, 3, 1, 1);
gridPane.add(lbl5, 0, 4, 1, 1);
  
  
  
gridPane.add(text1, 1, 0, 1, 1);
gridPane.add(text2, 1, 1, 1, 1);
gridPane.add(text3, 1, 2, 1, 1);
gridPane.add(text4, 1, 3, 1, 1);
gridPane.add(text5, 1, 4, 1, 1);
gridPane.add(btn, 1, 6, 1, 1);
  
StackPane root = new StackPane();

  
  
root.getChildren().add(gridPane);
Scene scene = new Scene(root, 300, 250);
  
primaryStage.setTitle("Check Object Customer");
primaryStage.setScene(scene);
primaryStage.show();
}

  
public static void main(String[] args) {
launch(args);
}
  
}

//////////////////////////////////////////////////

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class Custgui extends Application {
  
@Override
public void start(Stage primaryStage) {
  

Label lbl1 = new Label("\tName");
Label lbl2 = new Label("\tAddress");
Label lbl3 = new Label("\tTelephone Number");
Label lbl4 = new Label("\tCustomer Number");
Label lbl5 = new Label("\tTo be add in mail list");
Label lbl6 = new Label("\tCustomer Spent");
  
TextField text1 = new TextField();
TextField text2 = new TextField();
TextField text3 = new TextField();
TextField text4 = new TextField();
TextField text5 = new TextField();
TextField text6 = new TextField();
  
Button btn = new Button();
btn.setText("Check Class");
btn.setOnAction(new EventHandler<ActionEvent>() {
private Object MessageBox;
private Object Dialogs;
  
@Override
public void handle(ActionEvent event) {
PreferredCustomer pc=new PreferredCustomer();
boolean b1=pc.setName(text1.getText());
boolean b2=pc.setAddress(text2.getText());
boolean b3=pc.setTelephoneNo(text3.getText());
boolean b4=pc.setCustNo(text4.getText());
boolean b5=pc.setToBeMailLst(text5.getText());
boolean b6=pc.setAmount(text6.getText());
Alert al=new Alert(Alert.AlertType.INFORMATION);
  
if(b1 && b2 && b3 && b4 && b5 && b6){
  
al.setTitle("Object Data");
al.setContentText(pc.toString());
al.show();
}
else{
String s="";
if(b1==false){
s+="\nError in Name";
}
if(b2==false){
s+="\nError in Address";
}
if(b3==false){
s+="\nError in Telephone Number";
}
if(b4==false){
s+="\nError in Customer Number";
}
if(b5==false){
s+="\nError , Write [ true or false ] ";
}
if(b6==false){
s+="\nError in Amount";
}
  
al.setTitle("Error On Data");
al.setContentText(s);
al.show();
}
  
}
});
  
GridPane gridPane = new GridPane();

gridPane.setHgap(10);
gridPane.setVgap(10);
  
  
gridPane.add(lbl1, 0, 0, 1, 1);
gridPane.add(lbl2, 0, 1, 1, 1);
gridPane.add(lbl3, 0, 2, 1, 1);
gridPane.add(lbl4, 0, 3, 1, 1);
gridPane.add(lbl5, 0, 4, 1, 1);
gridPane.add(lbl6, 0, 5, 1, 1);
  
  
  
gridPane.add(text1, 1, 0, 1, 1);
gridPane.add(text2, 1, 1, 1, 1);
gridPane.add(text3, 1, 2, 1, 1);
gridPane.add(text4, 1, 3, 1, 1);
gridPane.add(text5, 1, 4, 1, 1);
gridPane.add(text6, 1, 5, 1, 1);
gridPane.add(btn, 1, 6, 1, 1);
  
StackPane root = new StackPane();

  
  
root.getChildren().add(gridPane);
Scene scene = new Scene(root, 300, 250);
  
primaryStage.setTitle("Check Object PreferredCustomer");
primaryStage.setScene(scene);
primaryStage.show();
}

  
public static void main(String[] args) {
launch(args);
}
  
}