can someone help i need to add a subclass

Question

cltc72 0 Newbie Poster

20 Years Ago

i need to a sub class for the boat rental but i am not sure how to do it i will give the code and it needs to inherit to the parent class can somw help out

java

AutoRental.java (3.57 KB)

/*****************************************************************
 *Steven M Johnston
 *AutoRental Class
 *Prof Ganson
 *Project 3
 *
 ******************************************************************/

public class AutoRental extends VehicleRental
{
/*************************************************************
 *
 *declare start and end mileage variables 
 *
 *************************************************************/
	private int start_mileage;
	private int end_mileage;
	
/**************************************************************
 *
 *Default Constructor
 *
 *Description: initializes all of the private data members of the
 *auto rental class to zero
 *
 *Input:No inputs
 *
 *Ouput:No outputs or returned values
 *
 **************************************************************/
	
	public AutoRental()
	{
		super();
		this.start_mileage=0;
		this. end_mileage=0;
	}
	
/***************************************************************
 *
 * Overloaded Constructor
 *
 *Description: The overloaded constructor have parameters that are
 *used to set the values of the private data members to the values
 *passed to the method.
 *
 *Input: The customer id number of the renter  
 *and the manufacture of the vechile
 *
 *Output: no output or returned values in this method
 *
 ***************************************************************/
	public AutoRental(String manufacture, int IdNum)
	{
		super(IdNum,manufacture);
		this.start_mileage=0;
		this.end_mileage=0;
		
	}
	
/***************************************************************
 *
 *compute fee method
 *
 *Description: compute the fee for rented car/auto
 *
 *Input: NONE
 *
 *Output: computed fee is returned to the call method as a double
 *
 ***************************************************************/
	public double computeFee()
	{
	double cost,fee;
	int excess_mileage;
	int mileage = end_mileage - start_mileage;
	if(mileage > 1000)
	{
		 excess_mileage = mileage-1000;
		 cost = excess_mileage * .15;
		 fee = 300.00 + cost;
		return fee;
	}
	else 
	{
		fee = 300.00;
		return fee;
	}
	}
/***************************************************************
 *
 *Return Vehicle method
 *
 *Description: Sets the rentout to false and sets the end mileage
 *
 *Input: The end mileage
 *
 *Output: None 
 *
 ***************************************************************/		
	public void returnVehicle(int end_mileage)
	{
		
	this. end_mileage= end_mileage;
	rentOut=false;
	
	}
/***************************************************************
 *
 *rent vehicle method
 *
 *Description: sets start mileage to teh end mileage and end mileage to 0
 *
 *Input: The  ID Number
 *
 *Output: None
 *
 ***************************************************************/	
	public void rentVehicle(int IdNum)
	{

	setIdNum(IdNum);
	start_mileage = end_mileage;
	end_mileage=0;
	rentOut=true;
	}
/***************************************************************
 *
 *to String method
 *
 *Description: Print Information
 *
 *Input: NONE
 *
 *Output: NONE
 *
 ***************************************************************/	
	public String toString()
	{
	String s,t;
	double u;
	
	if(rentOut==true)
	{
		t="out";
		s="Manufacture: "+getManufacture()+"\n"+ "Rented to Customer #:"+ 
		getIdNum() +"\n"+ "Status:"+ t +"\n\n";
	}
		
				
	else
{
		t="in";
		u=computeFee();
		
		s="Manufacture: "+getManufacture()+"\n"+ "Last rented to Customer #"+ 
		getIdNum() +"\n"+ "Status:"+ t +"\n"+"Cost:"+u+"\n\n";
}
	return s;
	}
}

TestRental.java (1.52 KB)

public class TestRental
{
	public static void main(String [] args)
	{
	//create array that will hold any rentable object
	VehicleRental[] vr=new VehicleRental[3];
	
	//create 3 rented objects of Auto and Boat

	VehicleRental fordRental= new AutoRental("Ford", 1001);
	VehicleRental chevyRental= new AutoRental("Chevy", 1234);
	VehicleRental sailRental= new BoatRental("Pearson", 5678);
		
	//assign objects to arrey elements
	//This can be done because of the casting when objects were created

	vr[0]= fordRental;
	vr[1]= chevyRental;
	vr[2]= sailRental;
	
	//Print elements of arrey
	for (int i=0; i<vr.length; i++)
	System.out.println(vr[i]);
		
	System.out.println("**************");
	
	//Customers return some of their rented vehicles
	//note taht teh chevyrental(vr[1]) has not been returned, see sample run
	vr[0].returnVehicle(1200);
	vr[2].returnVehicle(5);
	
	//Print elements of Arrey
	for (int i=0; i<vr.length; i++)
	System.out.println(vr[i]);
	
	System.out.println("**************");
	// allow new customers to rent vehicles
	// supply method with new customerID
	vr[0]. rentVehicle(9999);
	
	for (int i=0; i<vr.length; i++)
	System.out.println(vr[i]);
	
	System.out.println("**************");
	//Customers return more of their rented vehicles
	// These are auto rentals,so must supply method with amount of miles on auto
	vr[0].returnVehicle(3500);
	vr[1].returnVehicle(850);
	
	for (int i=0; i<vr.length; i++)
	System.out.println(vr[i]);
	
	System.out.println("**************");
}
}

VehicleRental.java (1.15 KB)

/*****************************************************************
 *Project: Rental Agency
 *Date Due: 
 *Prof: J. Ganson
 ******************************************************************/

public abstract class VehicleRental
{
	// declare variables
	private String manufacture;
	private int IdNum;
	public boolean rentOut;
	
	// Method that inisalize the variables
	public VehicleRental()
	{
		this.manufacture="none";
		this.IdNum=0;
		this.rentOut= true;
	}
	
	// Method with Default Constructors
	public VehicleRental(int IdNum, String manufacture)
	{
		this.manufacture=manufacture;
		this.IdNum=IdNum;
		this.rentOut= true;
	}
	//Method to get Manufature
	public String getManufacture()
	{
		
		return manufacture;
	}
	//Method to get ID Number
	public int getIdNum()
	{
		return IdNum;
	}
	// Method too set RentOut
	public void setRentOut(boolean ans)
	{
		rentOut=ans;
	}
	//Method to set ID Number
	public void setIdNum(int CusId)
	{
		this.IdNum=CusId;
	}
	
	// 
	public abstract double computeFee();
	
	public abstract void returnVehicle(int chargeable);
	
	public abstract void rentVehicle(int IdNum);
		
}

2 Contributors
3 Replies
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12 Hours Discussion Span
Latest Post 20 Years Ago Latest Post by Narue

Narue 5,707 Bad Cop

20 Years Ago

I don't download attachments. If your code is relatively short, post it. Anyway, what are you having problems with? Do you know how to derive from a base class? You're not really giving us much to work with here.

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cltc72 0 Newbie Poster · Answer 1 · 2004-11-15T03:20:56+00:00

i am not to sure how to write a sub class to inherit it from the main class there are no viruses in the code i check it and recheck it if someone can look at it. thanks

Narue 5,707 Bad Cop Team Colleague · Answer 2 · 2004-11-15T03:27:46+00:00

>i am not to sure how to write a sub class to inherit it from the main class

class base {
  // Stuff
}

class derived extends base {
  // Stuff
}

It's really very simple, but I'm sure your book (you do have one, right?) will explain the details far better than I could in a short post.

>there are no viruses in the code i check it and recheck it
I'm not as worried about that as I am lazy. Why should I work harder to help you? I have no vested interest in your success, so you should at least put some effort into helping me help you.