模板方法模式（Template Method Pattern）

    在模板方法模式中，一个抽象类定义模板方法，然后以本身不可覆盖的方法中调用这些模板方法。实现类继承这个抽象类，覆盖原来需要重新定义业务逻辑的模板方法。这个模式属于行为型模式之一，也是比较常用的设计模式之一。

    实例实现，定义一个抽象类Game，分别定义其继承类Cricket和Football。UML类图如下所示：

定义游戏类Game.java

public abstract class Game {
   abstract void initialize();
   abstract void startPlay();
   abstract void endPlay();
 
   //template method
   public final void play(){
 
      //initialize the game
      initialize();
 
      //start game
      startPlay();
 
      //end game
      endPlay();
   }
}

具体实现类Cricket.java

public class Cricket extends Game {
 
   @Override
   void endPlay() {
      System.out.println("Cricket Game Finished!");
   }
 
   @Override
   void initialize() {
      System.out.println("Cricket Game Initialized! Start playing.");
   }
 
   @Override
   void startPlay() {
      System.out.println("Cricket Game Started. Enjoy the game!");
   }
}

具体实现类Football.java

public class Football extends Game {
 
   @Override
   void endPlay() {
      System.out.println("Football Game Finished!");
   }
 
   @Override
   void initialize() {
      System.out.println("Football Game Initialized! Start playing.");
   }
 
   @Override
   void startPlay() {
      System.out.println("Football Game Started. Enjoy the game!");
   }
}

测试类，测试运行结果。

public class TemplatePatternDemo {

   public static void main(String[] args) {

      Game game = new Cricket();

      game.play();

      System.out.println();

      game = new Football();

      game.play();             

   }

}

运行结果：

Cricket Game Initialized! Start playing.
Cricket Game Started. Enjoy the game!
Cricket Game Finished!
 
Football Game Initialized! Start playing.
Football Game Started. Enjoy the game!
Football Game Finished!

    是不是觉得这里例子挺简单的，这个模式确实很简单。

模板方法模式（Template Method Pattern）

原文：http://blog.csdn.net/john_f_lau/article/details/19164883