Thread: Arrays being initialized from another class

Hey, my program is supposed to display stores, their unique identification number, and their income. I realize that my code doesn't accurately demonstrate the program intended.

My test code says that the error is in bold saying that "the variable storeID might not have been initialized."

import javax.swing.JOptionPane;
import java.text.DecimalFormat;
import java.text.NumberFormat;
 
public class store
{
    public static void main(String[] args)
    {  
        payroll storeID[];
 
        DecimalFormat df = new DecimalFormat("#,##0.00");
        NumberFormat nf = NumberFormat.getCurrencyInstance();
 
        double income;
        byte currentStore;
 
        currentStore = 0;
 
        //Used to store the data in the arrays in the future.
        while(currentStore <= 7)
        {
            JOptionPane.showMessageDialog(null,
                [B]storeID[currentStore],[/B]
                "Store " + storeID[currentStore],
                JOptionPane.PLAIN_MESSAGE);
 
            currentStore += 1;
        }
    }
}

public class storeSource
{
    //Number of stores
    public final int num_stores = 7;
 
    //Creates an array to hold the store's identification number.
    private int[] storeID = {5658845, 4520125, 7895122, 8777541, 8451277, 1302850, 7580489};
 
    //Creates an array to hold the total income that each store earns.
    private double[] wages = new double[num_stores];
}

Can I gain some insight with this?

local variables are different from data members(or Global variables), a local variable should be initialized before you use it else where inside methods, so the compiler will have the idea what are their default values.

storeID[] - this is an array not just an ordinary variable or identifier, the compiler can not understand its size or its contents when you use it somewhere(i.e inside your while loop)

The code you've provided is not sufficient to draw any conclusion, what's wrong. Post the SSCCE

To your current code: What is payroll?
And you can assign values to an array but not the object that expects array to be created but not yet created.

To your current code: What is payroll?

oh i didnt notice that very carefully, -_-, i just assume that he got an initializing problem.

Do you have two variables named: storeID?
That can be confusing

Originally Posted by Norm

Do you have two variables named: storeID?
That can be confusing

No I am trying to get my store.class to retrieve the data from the storeSource.class and when I take out "storeSource storeID;" the variable can't be found.

What are each of the two arrays used for? Are they related in any way or are they completely independent of each other?

Originally Posted by Norm

What are each of the two arrays used for? Are they related in any way or are they completely independent of each other?

The store.class file is supposed to refer to the storeSource.class file in order to later store data under other arrays. The storeID array below is to be referred to when creating arrays (to keep consistency).

public class storeSource
{
    //Number of stores
 
    //Creates an array to hold the store's identification number.
    [B]private int[] storeID = {1, 2, 3, 4, 5, 6, 7};[/B]
 
    //More code
}

If there is no confusion with having the same name, then leave it.

Originally Posted by Norm

If there is no confusion with having the same name, then leave it.

There isn't confusion the code won't let me access the data from the array on the storeSource.class on the store.class.

the code won't let me

Please post the code and the error messages.

access the data from the array on the storeSource.class on the store.class

For methods in the Store class to access data in the StoreSource class, you can add some methods to the StoreSource class that the Store class methods can call to get the data from the storeID array.

Where is the variable: employeeID used in the code you just posted???

Sorry Norm employeeID is on another part of my outlined program my latter post has been changed.

Where does the program assign a value to the storeID variable? The compiler thinks there is a way for it to not have a value.

My problem is solved I only used one array and finally import the other class correctly. I will share my findings soon.