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Java Compilation error and how to continue from this
3 Answer(s)      4 years and 8 months ago
Posted in : Java Beginners


Camford Cars Rental Pte Ltd requires a software system to manage its daily operations like renting and returning of vehicles,booking and cancelling bookings,checking the availability of its vehicle,etc.

For this project i am required to write the application only for renting its vehicles.
The completed application should produce the following outputs:
1.When a rental is successful.Eg
-first the system asks the user to "Enter model to rent:"
-if model is available it then displays,"Model(model name) is available"
-it then asks the user to "Enter the no. of days required:"
-after the user enter the duration,it displays the "Details" on the "Deposit:" and "Daily rate:" and "Duration:" and the "Total cost:" and asks wether the user want to "Proceed to rent:? (y/n):"
-if the user enters y,it then displays"Enter name of customer:"
-after entering name of customer,it askd to "Enter IC No:"
-Then next it prints receipt by displaying"Printing receipt"showing in each line"Customer name:" "Ic No:" "Car:" "Reg No:" "Duration: and in lastly "Total cost:"
-lastly after all these it displays "Serving next customer" and the prcoess goes on.
2.if the rental is unsucessful,when asked for "Proceed to rent?(y/n):" the user enters n and is just displays "Serving next customer"
3.If car model is not found,after entering car model it displays"No such model" and displays "Serving next customer"
The following cars are available for rental.Use the following data
Make: Model: Registration No Deposit Rate
Toyota Altis SJC2456X 100 60
Toyota Vios SJG 9523B 100 50
Nissan Latio SJB 7412B 100 50
Nissan Murano SJC8761M 300 150
Honda Jazz SJB4875N 100 60
Honda Civic SJD73269C 120 70
Honda Stream SJL5169J 120 70
Honda Odyssey SJB3468E 200 150
Subaru WRX SJB8234L 300 200
Subaru Imprezza SJE8234K 150 80

The classes that make up the system are 1.Customer-name:String -icNo:String 2.Payment-customer:Customer +makePayment(rent:Rental):void 3.Rental-customer:Customer -car:Car -noOfDays:int 4.IssueCarUI -request model:String -customer:Customer -payment:Payment -rental:Rental -databae:Database -noOfDays:int +showCarDetails(request model:String):void +calculateCost(noOfDays:int):int +makePayment():void 5.Car -regNo:String -make:String -model:String -deposit:int -rate:int +calculateCost(noOfDays:int):int 5.Database -carList:Car[] +findCarByModel(): +showDetails():void +calculateCost(noOfDays:int):int


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January 24, 2010 at 4:01 PM


public class CamfordCarsRental {
public static void main (String args[]) {
IssueCarUI abc = new IssueCar();
}
}


public class Car {

//declare variables
private String regNo;
private String make;
private String model;
private int deposit;
private int rate;

//constructor
public Car(String newRegNo, String newMake, String newModel, int newDeposit, int newRate) {
regNo = newRegNo;
make = newMake;
model = newModel;
deposit = newDeposit;
rate = newRate;
}

//operations
public void setRegNo(String newRegNo) {
regNo = newRegNo;
}

public void setMake(String newMake) {
make = newMake;
}

public void setModel(String newModel) {
model = newModel;
}

public void setDeposit(int newDeposit) {
deposit = newDeposit;
}

public void setRate(int newRate) {
rate = newRate;
}

public String getRegNo() {
return regNo;
}

public String getMake() {
return make;
}

public String getModel() {
return model;
}

public int getDeposit() {
return deposit;
}

public int getRate() {
return rate;
}

public int calculateCost(int noOfDays) {
return (noOfDays * rate) + deposit;
}


}//end class


public class Customer {

//declare variables
private String name;
private String icNo;

//constructor
public Customer(String newName, String newIcNo) {
name = newName;
icNo = newIcNo;
}

//operations
public void setName(String newName){
name = newName;
}

public void setIcNo(String newIcNo){
icNo = newIcNo;
}

public String getName(){
return name;
}

public String getIcNo(){
return icNo;
}


}//end class

public class Database {

//declare variables
private Car[] carList;

//constructor
public Database() {

carList = new Car[10];

carList[0] = new Car("SJC2456X", "Toyota", "Altis", 100, 60);
carList[1] = new Car("SJG9523B", "Toyota", "Vios", 100, 50);
carList[2] = new Car("SJB7412B", "Nissan", "Latio", 100, 50);
carList[3] = new Car("SJC8761M", "Nissan", "Murano", 300, 150);
carList[4] = new Car("SJB4875N", "Honda", "Jazz", 100, 60);
carList[5] = new Car("SJD73269C", "Honda", "Civic", 120, 70);
carList[6] = new Car("SJL5169J", "Honda", "Stream", 120, 70);
carList[7] = new Car("SJB3468E", "Honda", "Odyssey", 200, 150);
carList[8] = new Car("SJB8234L", "Subaru", "WRX", 300, 200);
carList[9] = new Car("SJE8234K", "Subaru", "Imprezza", 150, 80);
}

//operations
public void setCarList( Car[] newCarList) {
carList = newCarList;
}

public Car[] getCarList() {
return carList;
}

public Car findCarByModel(String Model) {

for(int r=0; r<carList.length; r++) {

if(carList[r].getModel().equalsIgnoreCase(Model)) {

String availMessage = "Model " + Model + " is available";

String outputMessage = availMessage;

System.out.print(outputMessage);
return carList[r];
}
}


String notAvailMessage = "No such model\n";

String outputMessageTwo = notAvailMessage;

System.out.print(outputMessageTwo);

return null;
}

public void showDetails() {


}

public int calculateCost(int noOfDays) {
return noOfDays;

}

}//end class


import java.util.Scanner;
public class IssueCarUI {

//declare variables
private String requestModel;
private Customer customer;
private Payment payment;
private Rental rental;
private Database database;
private int noOfDays;

Scanner input = new Scanner(System.in);

//constructor
public IssueCarUI(String newRequestModel, Customer newCustomer, Payment newPayment, Rental newRental, Database newDatabase, int newNoOfDays) {
requestModel = newRequestModel;
customer = newCustomer;
payment = newPayment;
rental = newRental;
database = newDatabase;
noOfDays = newNoOfDays;

}

//operations
public void setRequestModel(String newRequestModel) {
requestModel = newRequestModel;
}

public void setCustomer(Customer newCustomer) {
customer = newCustomer;
}

public void setPayment(Payment newPayment) {
payment = newPayment;
}

public void setRental(Rental newRental) {
rental = newRental;
}

public void setDatabase(Database newDatabase) {
database = newDatabase;
}

public void setNoOfDays(Rental newRental) {
rental = newRental;


}//end class
}



public class Payment {

//declare variables
private Customer customer;

//constructor
public Payment(Customer newCustomer) {
customer = newCustomer;
}

//operations
public void setCustomer(Customer newCustomer) {
customer = newCustomer;
}

public Customer getCustomer() {
return customer;
}

public void makePayment(Rental rent){

}

}//end class





ublic class Rental {

//declare variables
private Customer customer;
private Car car;
private int noOfDays;

//constructor
public Rental(Customer newCustomer, Car newCar, int newNoOfDays) {
customer = newCustomer;
car = newCar;
noOfDays = newNoOfDays;
}

//operations
public void setCustomer(Customer newCustomer) {
customer = newCustomer;
}

public void setCar(Car newCar) {
car = newCar;
}

public void setNoOfDays(int newNoOfDays) {
noOfDays = newNoOfDays;
}

public Customer getCustomer() {
return customer;
}

public Car getCar() {
return car;
}

public int getNoOfDays() {
return noOfDays;
}

}//end class



//use this file to start your project by executing this file.
//DO NOT add, take away or change anything in this file

public class TestProject {
public static void main (String args[]) {
IssueCarUI abc = new IssueCarUI();
}// end main
}//end class






This is what i have done so far for my project however when i compile some of the classes there is error and now i need to know how to add operations to the IssueCarUI class so that the application will run well and when it is started it asks "Enter model to rent:" and after enetring the model it displays"Model is available" and asks "Enter the no. of days required:" this process goes on just like in the example given in the question. Hope some one will help me in this..i will really appreciate it



January 25, 2010 at 11:12 AM


The error is with the incorrect constructor used for IssueCarUI() class. There is no default constructor defined. Also the user input not initialized with the IssueCarUI class constructor arguments. input object of Scanner class not reading the console input. Try to read this input in default constructor of IssueCarUI class and initialize the arguments of it with that input. If needed, I will send the updated classes of working example in email.


January 27, 2010 at 11:11 AM


Hi Friend,

Try the following code:

import java.util.*;
class Car{
private String make;
private String model;
private String regNo;
private int deposit;
private int rate;

public Car(String newMake, String newModel,String newRegNo, int newDeposit, int newRate) {
make = newMake;
model = newModel;
regNo = newRegNo;
deposit = newDeposit;
rate = newRate;
}
public String getMake() {
return make;
}
public String getModel() {
return model;
}
public String getRegNo() {
return regNo;
}
public int getDeposit() {
return deposit;
}
public int getRate() {
return rate;
}
}
public class TestProject {
public static void main (String args[]) {
List<Car> carlist=new ArrayList<Car>();
carlist.add(new Car("Toyota", "Altis","SJC2456X", 100, 60));
carlist.add(new Car("Toyota", "Vios","SJG9523B", 100, 50));
carlist.add( new Car("Nissan", "Latio","SJB7412B", 100, 50));
carlist.add(new Car("Murano","SJC8761M", "Nissan", 300, 150));
carlist.add(new Car("Honda", "Jazz","SJB4875N", 100, 60));
carlist.add(new Car("Honda", "Civic","SJD73269C",120, 70));
carlist.add(new Car("Honda", "Stream","SJL5169J", 120, 70));
carlist.add(new Car( "Honda", "Odyssey","SJB3468E", 200, 150));
carlist.add(new Car( "Subaru", "WRX", "SJB8234L",300, 200));
carlist.add(new Car("Subaru", "Imprezza","SJE8234K", 150, 80));
Scanner input=new Scanner(System.in);
System.out.print("Enter model to rent: ");
String model=input.nextLine();
for (Car s : carlist){
if(model.equals(s.getModel())){
System.out.println("Model "+model+" is available");
System.out.print("Enter number of days: ");
int days=input.nextInt();
System.out.println("***************Details*****************");
int cost=(days*s.getRate())+s.getDeposit();
System.out.println("Deposit DailyRate Duration TotalCost");
System.out.println(s.getDeposit()+" "+s.getRate()+" "+days+" "+cost);
System.out.print("Proceed to rent?( y/n ): ");
String dec=input.next();
if(dec.equals("y")){
System.out.println("Enter Customer Name: ");
String name=input.next();
System.out.println("Enter IC Number: ");
int num=input.nextInt();
System.out.println("************Receipt*************");
System.out.println("Name IC No Car Reg No Duration Total Cost");
System.out.println(name+" "+num+" "+s.getMake()+" "+model+" "+s.getRegNo()+" "+days+" "+cost);
System.out.println("Serving Next Customer ");
}
else if(dec.equals("n")){
System.out.println("Serving Next Customer: ");
}
}
}
}
}


Thanks


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