模板模式

Posted 2020-10-16 K_artorias

描述

通过抽象函数定义一个模板，模板中定义抽象的函数。所有继承实现该类的子类都按照自己的实际需求实现其中的类，这样，就把这个抽象类当做了模板。

实例

//模板类
public abstract class Game {
   abstract void initialize();
   abstract void startPlay();
   abstract void endPlay();

   //模板
   public final void play(){

      //初始化游戏
      initialize();

      //开始游戏
      startPlay();

      //结束游戏
      endPlay();
   }
}

//根据模板类实现实体类
//实体类1
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!");
   }
}

//实体类2
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!");
   }
}

//主函数
public class TemplatePatternDemo {
   public static void main(String[] args) {

      Game game = new Cricket();
      game.play();
      System.out.println();
      game = new Football();
      game.play();        
   }
}

输出结果：
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!

　　

代码来源： 特别感谢 菜鸟教程 java设计模式之模板模式