asked on

Obtain fixed array from different class

Hi,
I'd like to know how to access a fixed array from different class.
I'm trying to create a visit method in the CoffeeCart class that checking if the office in that array exist than the CoffeeCart will visit that office and automatically will increase the amount of the cup which will be given to the employees in that particular office.

Below here is the code that I've done so far but it always says cannot resolve symbol numOffice which is the name of the array in the company class.

public class CoffeeCart
{
private Company visitOffice;
private Office emp;
private int cups=0;

public void visit(Office myOffice)
{
Company theVisit = visitOffice.addOffice(numOffice[office]);
int index =0;
while(index < theVisit.length)
{
if(theVisit[index] == null)
{
theVisit[index] = myOffice;
cups += emp.getNumEmployees();
break;
}
index++;
}
}

public class Company
{
    // instance variables
    private CoffeeCart theCoffeeCart;
    private Office[] numOffice = new Office[4];
 
  public void addOffice(Office newOffice)
    {   
       int index = 0;
       while (index<numOffice.length)
       {
           if(numOffice[index] ==null)
           {
               numOffice[index] = newOffice;
               index = numOffice.length;
           }
           index++;
        }
        
    }
 
_______________________________________________________
public class Office
{
     private int numEmployees;
 
    public int getNumEmployees()
    {
        return numEmployees;
    }
 
   
   public void setNumEmployees(int newEmployees)
    {
        numEmployees = newEmployees;
    }

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hazgoduk

In your Company object you need a getArray() function that returns the array

avdej

Look at the code snipped I've prepared for you. It should explain you the issue.

1. Store class A into file A.java
2. Store class B into file B.java
3. Compile and run:
javac B.java
java B

You can access any PUBLIC field (no matter which type it has, e.g. Office[]) of some another class in the same way.

Avdej

public class A
{
    static public int i = 11;   // i belongs to class A
    public int j;               // j belongs to an INSTANCE of class A
    
    // CONSTRUCTOR
    public A(int j)
    {
        this.j = j;
    }
}
 
 
public class B
{
    static public void main(String[] args)
    {
        A a = new A(22);
        
        System.out.println("Accessing static field A.i --> " + A.i);    // --> 11
        System.out.println("Accessing dynamic field A.j --> " + a.j);   // --> 22
    }
}

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VanJava

ASKER

The thing is I can't change my field status into public, it would make my life easier if i can do that

hazgoduk

You don't change the field to public, you create a public get function to it.

Change your Company class to include the getNumOffice function as below, then you can call theVisit.getNumOffice[i]

public class Company
{
    // instance variables
    private CoffeeCart theCoffeeCart;
    private Office[] numOffice = new Office[4];
 
    public void addOffice(Office newOffice)
    {   
       int index = 0;
       while (index<numOffice.length)
       {
          if(numOffice[index] ==null)
          {
             numOffice[index] = newOffice;
             index = numOffice.length;
          }
          index++;
       }
   }
 
   public Office[] getNumOffice()
   {
      return numOffice();
   }
}

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avdej

Hi, VanJava,

Unfortunately it seems that besides of that particular issue your program has a lot of another design inconsistencies and bugs.

For example the following lines have no healthy meaning and will never work:
Company theVisit = visitOffice.addOffice(numOffice[office]);
int index =0;
while(index < theVisit.length)
...
1. visitOffice.addOffice(...) returns 'void' -> whereas you try to get Company from it.
2. numOffice belongs to Company -> you try to access it locally
3. Company has no field named 'length' -> you try to use it in ' theVisit.length'
etc.

I suggest you post all the code you have written so far. I'll bring it into runnable state. Then you can study it and modify it to meet your particular needs.

Avdej

ASKER CERTIFIED SOLUTION

VanJava

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