Package becker.xtras.comboLock

The comboLock package provides a graphical user interface (GUI) for a combination lock that uses an instance of a student-written class implementing the IComboLock interface.

See:
Description

Interface Summary

IComboLock

An interface for a combination lock object.

Class Summary

ComboLockGUI	A graphical user interface (GUI) for a combination lock.
SampleComboLock	A sample class implementing IComboLock interface.

Package becker.xtras.comboLock Description

The comboLock package provides a graphical user interface (GUI) for a combination lock that uses an instance of a student-written class implementing the IComboLock interface. The GUI appears like this:

A typical main method to run this program would be

import becker.xtras.comboLock.*;

public class Main
{
   public static void main(String[] args) 
   {  // create a new combination lock with a "combination" of 10, 20, 30
      IComboLock lock = new ComboLock(10, 20, 30);
      ComboLockGUI gui = new ComboLockGUI(lock);
   }    
}

where ComboLock is written by the student and implements the IComboLock interface. Substituting SampleComboLock for ComboLock in the above code will yield a working demonstration program.

This program uses the Model-View-Controller pattern. The class implementing IComboLock is the model. It must arrange to update the views each time the model's state (that is, one of its instance variables) changes. This can be done easily with code such as the following:

import becker.util.IView;
import becker.util.ViewList;

public class ComboLock implements IComboLock
{
   private ViewList views = new ViewList();

   ...
   
   public void stateChangingMethod()
   {  ...
      this.views.updateViews();
   }
   
   public void addView(IView aView)
   {  this.views.addView(aView);
   }
}