Having problems with an arrays assignment

[Shananne DuFrame]

Heres my testing program:

 
public class TestListStudent
{
public static void main (String [] args)
{
String[] names = {"jeans", "shirt", "boots"};
double[] costs = {39.99, 24.75, 105.00};
int[] stores = {16, 29, 3};
MallList listOne = new MallList(names, costs, stores);
}
}
   

Heres my list class, which is the one I'm having problems coding...I'm not sure how to set this one up.

 import java.io.*;
 
public class MallList
{
 
private MallItem[] names;
private MallItem[] costs;
private MallItem[] stores;
private int length;
 
private MallItem[] list;;
 
public MallList()
{

list = new MallItem [5];
 
for(int i = 0; i < 500; i++)
list[i] = null;
 

length = 0;
}
 
public void print()
{
for(int i = 0; i < length; i++)
list[i].printInfo();
}
}   

other classes include:

public class MallItem extends Item
{
 
private Item names;
private Item costs;
private int mallStoreNumber;
 
public MallItem(String names, double costs, int stores)
{
super(names, costs);
mallStoreNumber = stores;
}
 
public MallItem()
{
super("", 0.00);
mallStoreNumber = 0;

}
 
public void printMallItem()
{
System.out.println(super.toString());
System.out.println();
System.out.println(mallStoreNumber);
}
 
public void printInfo()
{
System.out.println(super.toString());
System.out.println(mallStoreNumber);
}
 
public void setInfo(String names, double costs,
int stores)
{
super.setItem(names,costs);
mallStoreNumber = stores;
}
 
public int getStoreNumber()
{
return mallStoreNumber;
}

public void setMallStoreNumber(int stores)
   {
  mallStoreNumber = stores;
    
   }
 

}
    

and the base class is:

 
 public class Item
{
   private String description;//variable to store the name
   private double dCost;//variable to store the price
   
//Default constructor
//Data members description and dCost are set to the default values
//Postcondition: description = null; dCost = 0.00; 
   public Item()
   {
  description = "";
  dCost = 0.00;
  
   }
//Constructor to set the item
//Data members description and dCost are set according to the parameters
//Postcondition: description = name; dCost = price;
   public Item(String names, double costs)
   {
  description = names;
  dCost = costs;
 
   } 
//Method to return the name
 //Postcondition: The value of description is returned
   public String getName()
   {
   return description;
   }
//Method to return the price
//Postcondition: The value of dCost is returned
   public double getPrice()
   {
   return dCost;
   }
//Method to set the item
//Data members description and dCost are set according to the parameters
//Postcondition: description = name; dCost = price;
   public void setItem(String names, double costs)
   {
  description = names;
  dCost = costs;
  
   }
//Method to print the name of the item
   public String printName()
   {
 return (description);
   }
//Method to print the price of the item
   public double printPrice()
   {
 return (dCost);
   }
 
}  

Any help would be appreciated!!

[Justin Fox]

ok in the MallList class you have too many ';', and MallList doesn't
have a constructor with three arrays as parameters..

you have the following code, but no constructor for it.

MallList list = new MallList(String[],double[],int[]);

now MallItem does, but they are not arrays.

you need to pass a String[] name, double[] price, int[] store.

so in other words, change MallItem's argument constructor to

public MallItem(String[] name, double[] price, int[] store)
{
// etc.
}

and then instead of instantiating a object of type MallList, make one
of type MallItem.

Justin Fox
[ March 01, 2007: Message edited by: Justin Fox ]

[Justin Fox]

and for you problem with the MallList class, you need to pass
a MallItem as a parameter to the constructor of MallList.

like:

    
 
public MallList(MallItem A)
{
}
 
//*****************
// and then in the main you would do
//*****************
 
MallItem listOne = new MallItem(names,costs,stores);
MallList listTwo = new MallList(listOne);
 

now, for the MallList class, it's purpose is not really
all that neccesary..

unless MallList just has a collection or arraylist of
MallItems.

but anyways, hope that helps a little

Justin Fox

[Shananne DuFrame]

Ok... I tried to make changes of what I understood. I also added a few more thngs that I will need. Right now I am just trying to accomplish getting the list to print and the program to work. I will be adding methods after to print in reverse, addItems, removeItems and such. Right now I am just concerned with getting a working program that prints what is in the list.

Right now all classes compile... but my output is like this:

----jGRASP exec: java TestListStudent

Is the list full? false
MallList@45a877

----jGRASP: operation complete.

At least its compiling, its farther than I was before.
Heres my code again


Test Class

import java.io.*; 
 
public class TestListStudent
{
public static void main (String [] args)
{
String[] names = {"jeans", "shirt", "boots"};
double[] costs = {39.99, 24.75, 105.00};
int[] stores = {16, 29, 3};
MallList listOne = new MallList(names, costs, stores);
 

System.out.println("Is the list full? " + listOne.isFull());//check to see if list is full 
listOne.print();
System.out.println(listOne); 
} 
}
    

Base class Item:

public class Item
{
   private String description;//variable to store the name
   private double dCost;//variable to store the price
   
 
//Constructor to set the item
//Data members description and dCost are set according to the parameters
//Postcondition: description = name; dCost = price;
   public Item(String names, double costs)
   {
  description = names;
  dCost = costs;
 
   } 
//Method to return the name
 //Postcondition: The value of description is returned
   public String getName()
   {
   return description;
   }
//Method to return the price
//Postcondition: The value of dCost is returned
   public double getPrice()
   {
   return dCost;
   }
//Method to set the item
//Data members description and dCost are set according to the parameters
//Postcondition: description = name; dCost = price;
   public void setItem(String names, double costs)
   {
  description = names;
  dCost = costs;
  
   }
//Method to print the name of the item
   public String printName()
   {
 return (description);
   }
//Method to print the price of the item
   public double printPrice()
   {
 return (dCost);
   }
 
} 
    

Derived class:

 
public class MallItem extends Item
{
 
private Item names;
private Item costs;
private int mallStoreNumber;
 
public MallItem(String names, double costs, int stores)
{
super(names, costs);
mallStoreNumber = stores;
}
 
public MallItem()
{
super("", 0.00);
mallStoreNumber = 0;
}
 
public void printMallItem()
{
System.out.println(super.toString());
System.out.println();
System.out.println(mallStoreNumber);
}
 
public void printInfo()
{
System.out.println(super.toString());
System.out.println(mallStoreNumber);
}
 
public void setInfo(String names, double costs, int stores)
{
super.setItem(names,costs);
mallStoreNumber = stores;
}
 
public int getStoreNumber()
{
return mallStoreNumber;
}
 
public void setMallStoreNumber(int stores)
{
mallStoreNumber = stores;
}
 
}
 
   

MallList Class:

 
  import java.io.*;
 
public class MallList
{
private MallItem[] names;
private MallItem[] costs;
private MallItem[] stores; 
private int length;
int maxSize = 5;
private MallItem[] list;;
 
public MallList(String []names, double [] costs, int [] stores)
{
list = new MallItem [maxSize];
 
for(int i = 0; i < 5; i++)
list[i] = null;
 
length = 0;
}
 
public void print()
{
for(int i = 0; i < length; i++)
list[i].printInfo();
}
 
public boolean isFull()  
{ 
return (length == maxSize); 
} 
 
public void insert(MallItem eP)
{
list[length] = eP;
length++;
}
 

}  

[Justin Fox]

MallItem itemOne = new MallItem("jeans",40.00,16);

that is the format for MallItem

what you need to do is like the following

    
 
MallList list = new MallList();
list.add(itemOne);
 
//to print
 
public void print()
{
for(int i < list.length;i++)
{
System.out.print("item "+i+": "+list[i].getName()+","+list[i].getPrice());
}
}// thats not all you need to print, but maybe this will give you 
// a better idea of what to do
 

Justin

[Shananne DuFrame]

I got it working...Thanks for your help.

[Justin Fox]

no problem, sorry for "beating around the bush" but I wanted to help you learn how to identify the exact problem and find a solution for that problem, one problem at a time.


Justin

[Shananne DuFrame]

Not a problem....learn more that way. Sometimes from trial and error also. I had to try a few things a few times but I got it. Thanks!