設計模式-模板模式

1.什麼是模板模式

　　在模板模式（Template Pattern）中，一個抽象類公開定義了執行它的方法的方式/模板。它的子類能夠按須要重寫方法實現，但調用將以抽象類中定義的方式進行。這種類型的設計模式屬於行爲型模式

2.方法示例

　　

Game.java
public abstract class Game {
   abstract void initialize();
   abstract void startPlay();
   abstract void endPlay();
 
   //模板
   public final void play(){
 
      //初始化遊戲
      initialize();
 
      //開始遊戲
      startPlay();
 
      //結束遊戲
      endPlay();
   }
}

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!");
   }
}

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!");
   }
}

TemplatePatternDemo.java public class TemplatePatternDemo {
   public static void main(String[] args) {
 
      Game game = new Cricket();
      game.play();
      System.out.println();
      game = new Football();
      game.play();      
   }
}