设计模式-模板方法模式

一个抽象类公开定义了执行它的方法的方式/模板。它的子类可以按需要重写方法实现，但调用将以抽象类中定义的方式进行
定义一个操作中的算法的骨架，而将一些步骤延迟到子类中
把不变的部分移至父类, 去除子类重复代码

示例

public abstract class Game 
{
   public abstract void initialize();
   public abstract void startPlay();
   public abstract void endPlay();
 
   //模板
   public void play(){
 
      //初始化游戏
      initialize();
 
      //开始游戏
      startPlay();
 
      //结束游戏
      endPlay();
   }
}
public class Cricket : Game 
{
 
   public override void endPlay() {
      Console.WriteLine("Cricket Game Finished!");
   }
 
   public override void initialize() {
      Console.WriteLine("Cricket Game Initialized! Start playing.");
   }
 
   public override void startPlay() {
      Console.WriteLine("Cricket Game Started. Enjoy the game!");
   }
}
public class Football : Game 
{
 
   public override void endPlay() {
      Console.WriteLine("Football Game Finished!");
   }
 
   public override void initialize() {
      Console.WriteLine("Football Game Initialized! Start playing.");
   }
 
   public override void startPlay() {
      Console.WriteLine("Football Game Started. Enjoy the game!");
   }
}
Game game = new Cricket();
game.play();
System.out.println();
game = new Football();
game.play();