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Contents
   10.1 Type-Safe Enumeration Type
         10.1.1 A Simple Maze Game
         10.1.2 Enumeration Types
         10.1.3 Unordered Type-Safe Enumeration Idiom
         10.1.4 Ordered Type-Safe Enumeration Idiom
   10.2 Creational Design Patterns
         10.2.1 A Simple Design of the Maze Game
         10.2.2 Design Pattern: Abstract Factory
         10.2.3 Design Pattern: Factory Method
         10.2.4 Design Pattern: Prototype
         10.2.5 Design Pattern: Builder
   10.3 Behavioral Patterns
         10.3.1 Design Pattern: Command
         10.3.2 Supporting Undo
   10.4 Structural Patterns
         10.4.1 Design Pattern: Adapter
         10.4.2 Design Pattern: Composite

• Direction.java - an enumeration type of directions: NORHT, EAST, SOUTH, and WEST
• Orientation.java - an enumeration type of orientations: HORIZONTAL and VERTICAL

• The Maze game
• Design

• Implementation
• MapSite.java - an interface for map sites in a maze game
• Room.java - a room in a maze game, implements MapSite
• Door.java - a door in a maze game, implements MapSite
• Wall.java - a wall in a maze game, implements MapSite
• Maze.java  - a maze game
• SimpleMazeGame.java - a simple implementation of the maze game that does not use creational patterns
• Run the program as follows:

java maze.SimpleMazeGame
           - create a small two-room Maze game [screen shot]
java maze.SimpleMazeGame Large
           - create a large nine-room Maze game [screen shot]
• Use the arrow keys to move the palyer.
• A design and implementation of the Maze game using Abstract Factory pattern
• Desgin


• Separate views of the diagram for using each factory
• Using HarryPotterMazeFactory
• Using SnowWhiteMazeFactory
• Using default MazeFactory
• Implementation
• Abstract factories
• MazeFactory.java - a factory that creates default style rooms, doors, and walls for the Maze game
• HarryPotterMazeFactory.java  -  a factory that creates "Harry Potter" style rooms, doors, and walls for the Maze game, extends MazeFactory
• SnowWhiteMazeFactory.java  -  a factory that creates "Snow White" style rooms, doors, and walls for the Maze game, extends MazeFactory
• Concrete products
• HarryPotterRoom.java - a "HarryPotter" style room in the maze game, extends Room
• HarryPotterDoor.java  - a "HarryPotter" style door in the maze game, extends Door
• HarryPotterWall.java - a "HarryPotter" style wall in the maze game, extends Wall
• SnowWhiteRoom.java - a "SnowWhite" style room in the maze game, extends Room
• SnowWhiteDoor.java - a "SnowWhite" style door in the maze game, extends Door
• SnowWhiteWall.java - a "SnowWhite" style wall in the maze game, extends Wall
• MazeGameAbstractFactory.java -  an implementation of the maze game that uses the Abstract Factory pattern
• Run the program as follows:

java maze.MazeGameAbstractFactory Harry
           - create a "Harry Potter" style Maze game  using the HarryPotterMazeFactory [screen shot]
java maze.MazeGameAbstractFactory Snow
           - create a "Snow White" style Maze game  using the SnowWhiteMazeFactory [screen shot]
java maze.MazeGameAbstractFactory
           - create a default  style Maze game  using the default MazeFactory [screen shot]

• Design


• Implementation
• The maze creators
• MazeGameCreator.java
• HarryPotterMazeGameCreator.java
• SnowWhiteMazeGameCreator.java
• Run the program as follows:

java maze.MazeGameCreator Harry
           - create a "Harry Potter" style Maze game  using the HarryPotterMazeGameCreator [screen shot]
java maze.MazeGameCreator Snow
           - create a "Snow White" style Maze game  using the SnowWhiteMazeGameCreator [screen shot]
java maze.MazeGameCreator
          - create a default  style Maze game  using the default MazeGameCreator [screen shot]

• Design


• Implementation
• MazePrototypeFactory.java  - An abstract factory for building maze game using Prototype design pattern
• Run the program as follows:

java maze.MazePrototypeFactory Harry
 - create a "Harry Potter" style Maze game  using instances of HarryPotterDoor, HarryPotterRoom, and HarryPotterWall as prototypes [screen shot]
java maze.MazePrototypeFactory Snow
 - create a "Snow White" style Maze game  using instances of SnowWhiteDoor, SnowWhiteRoom, and SnowWhiteWall as prototypes [screen shot]
java maze.MazePrototypeFactory
 - create a default  style Maze game  using instances of Door, Room, and Wall as prototypes [screen shot]
• A universal factory that uses Abstract Factory, Prototype and Singleton design patterns.
• UniversalMazeFactory.java
• It uses the following system properties to determine which factory will be used.
• maze.prototype
• "true "or "false": whether to use prototype based factory or not
• maze.theme
• "Harry", "Snow", or "Default": the theme used
• Run the program as follows:

java -Dmaze.prototype=proto -Dmaze.theme=theme maze.MazeUniversalFactory
Note: the -D options must come before the class name.

• Design


• Implementation
• The maze builders
• MazeBuilder.java - the interface
• SimpleMazeBuilder.java - a simple maze builder
• FactoryMazeBuilder.java - a maze builder using an abstract factory to create doors, rooms, and walls.
• The driver class
• MazeGameBuilder.java
• Run the program as follows:

java maze.MazeGameBuilder Harry
- create a "Harry Potter" style Maze game  using the FactoryMazeBuilder with HarryPotterMazeFactory [screen shot]
java maze.MazeGameBuilder Snow
- create a "Snow White" style Maze game  using the FactoryMazeBuilder with SnowWhiteMazeFactory [screen shot]
java maze.MazeGameBuilder Default
- create a default style Maze game  using the FactoryMazeBuilder with the default MazeFactory [screen shot]
java maze.MazeGameBuilder
- create a default  style Maze game  using the SimpleMazeBuilder [screen shot]

• Design


• Implementation
• The commands
• Command.java - the command interface
• UndoableCommand.java - the interface for undoable command
• MazeMoveCommand.java - the command class for make moves in the maze game
• The driver class
• UndoableMazeGame.java
• Run the program as follows:

java maze.UndoableMazeGame Harry
- create a "Harry Potter" style undoable maze game  using the FactoryMazeBuilder with HarryPotterMazeFactory [screen shot]
java maze.UndoableMazeGame Snow
- create a "Snow White" style undoable maze game  using the FactoryMazeBuilder with SnowWhiteMazeFactory [screen shot]
java maze.UndoableMazeGame Default
- create a default style undoable maze game  using the FactoryMazeBuilder with the default MazeFactory [screen shot]
java maze.UndoableMazeGame
- create a default style undoable maze game  using the SimpleMazeBuilder [screen shot]

• Design


 

Adapter using inheritance



Adapter using deligation


 

• Implementation
• Table.java - a generic table
• TableEntry.java - an interface for the entries to be displayed in the table, target of the adapter pattern
• Student.java - the adaptee class
• StudentEntry.java - an adapter using inheritance
• StudentEntry2.java - an adapter using deligation
• Main.java - the driver class
• Run the program as follows: [screen shot]

java adapter.Main
- show a student table using an inheritance-based adapter, StudentEntry
java adapter.Main Deligation
- show a student table using a deligation-based adapter, StudentEntry2

• Design


 
• Implementation
• MailboxItem.java - the abstract component
• MailFolder.java - a composite component
• Mail.java - a leaf component
• Two enumeration classes
• MailPriority.java
• MailStatus.java
• Main.java - the driver class
• Run the program as follows: [screen shot]

java mail.Main
• A GUI adaptation, using the Adapter pattern
• Design


• Implementation
• gui/MailEntry.java -- an adapter, with the Mail class as the adaptee and the TableEntry class as the target
• gui/Main.java - the driver class
• Run the program as follows: [screen shot]

java mail.gui.Main