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Display Classes

Introduction

The puzzle
Overview
The Goal
Playing

The algorithm
Simple
Best solution
Search
Heuristic

Program Design
Search Classes
Extensions
Display

Run

Finally, there are classes that display the problem state and allow the user to attempt a solution:

	FifteenPanel: A class that displays the state of the 15-puzzle as a 4 x 4 grid. It also allows the blocks to be clicked by the user, in order to move the puzzle "manually".
	Puzzle: This is the "main" class that holds everything together. It can be run either as an applet or as a stand-alone program (i.e. using main()). It creates a screen, and uses a FifteenPanel as one component on that screen.
	ValidUserMoveEvent: An event that is raised by the FifteenPanel to inform its container that a user has made a valid "manual" move in the panel.
	ValidUserMoveListener: Listens for a ValidUserMoveEvent. In this version, it is implemented by the Puzzle class. In this way, the Puzzle object can react to valid moves made and reflected by the FifteenPanel object.