public variables

[Juhan Voolaid]

hello

I'm having hard times with variables between the classes. I give you an example:

  
 
public class docMaker{
public static String filename;

public static void main(String[] args){

docMakerFrame d=new docMakerFrame();
}
}
 
public class docMakerFrame{
   docMakerFrame{
     filename="test";
     htmlMaker h=new htmlMaker();
   }
}
 
public class htmlMaker{

htmlMaker(){

System.out.println(filename);
}
}

So the "cannot resolve symbol" error comes in docMakerFrame class on this row:
filename="test";

and in htmlMaker constructor.


I don't understand why String filename is not accessable. Seems to me i give all the access rights.

[Darin Niard]

Classes don't share members with each other unless there is an inner/outer relationship, and of course in the case of inheritance.

All classes DO have access to your "filename" variable, ie, docMaker.filename is available for use.
[ August 03, 2004: Message edited by: Darin Niard ]

[Vijayendra V Rao]

Your code should be as follows:

  
 
public class docMaker
{
  public static String filename = "" ;

  public static void main(String[] args)
  {
    docMakerFrame d=new docMakerFrame();
  }
}
 
public class docMakerFrame
{
   docMakerFrame
   {
     docMaker.filename="test";
     htmlMaker h=new htmlMaker();
   }
}
 
public class htmlMaker
{
   htmlMaker()
   {
     System.out.println(docMaker.filename);
   }
}

[Vijayendra V Rao]

The concept is, you access static members of a class using the class name. Now the variable filename is a static member and therefore, it will have to be accessed in other classes by using the name of the class in which it is declared. Hence the syntax:

docMaker.filename;

Got it?

[Juhan Voolaid]

thank you .. now it's very clear. It's been a while since i used java and oo. language now i remember.

[Marilyn de Queiroz]

Making attributes non-private always rubs me the wrong way. I use getters and setters when I need to access private variables.