Sharing variables among frames

Question

I have a single package that has 4 separate class files:
* a base class (happens to be an applet)
* 3 frame classes
Can I create and instantiate a class variable in the base class and access it from any of the frame classes? How?
Currently I'm redundantly using separate objects in each frame class, which is obviously wasteful and slower performing.
Thanks.

Answer 1

I agree with jmccon: the simpliest (and most efficient) way to do this should be to create an interface, and use this interface to communicate. Create a custom constructor for your frames, and pass a reference to the interface of the main class as a parameter to the frame.
I.e:        public class MainClass implements CustomInterface {
          frame1 = new CustomFrame(this, ...);
          frame2 = new CustomFrame(this, ...);
          //... and so on...
          public void sharedMethod() {
             //Here is your shared code: of course, you can implement
             //getters/setters methods to access the MainClass members
             //or put members in the interface for a direct access.
       public class CustomFrame extends JFrame {
          private CustomInterface parent;
          public CustomFrame(CustomInterface parent) {
             this.parent = parent;
          //When you want to use the parent's interface
          parent.sharedMember = new Object();  // for example...
          parent.sharedMethod();               // for example...
       public interface CustomInterface {
          //You can put shared members...
          public Object sharedMember;
          //...and shared methods here!
          public void sharedMethod();
       }Hope this helped,
regards.