设计模式

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CanPlayDD.java：

package com.zking.entity;

public class CanPlayDD implements PlayDD{

   public void palyDD() {
       System.out.println("会打豆豆");
   }
}

JingJing.java

package com.zking.entity;

public class JingJing extends Student{

   private PlayDD playDD;

   public JingJing(){
       playDD=new CanPlayDD();
   }

   @Override
   public void playDD() {
       playDD.palyDD();
   }

}

LeiLei.java：

package com.zking.entity;

public class LeiLei extends Student{

   private PlayDD playDD;

   public LeiLei(){
       playDD=new CanPlayDD();
   }

   @Override
   public void playDD() {
       playDD.palyDD();
   }

}

MingMing.java：

package com.zking.entity;

public class MingMing extends Student{
   private PlayDD playDD;

   public MingMing(){
       playDD=new NoCanPlayDD();
   }

   @Override
   public void playDD() {
       playDD.palyDD();
   }
}

NoCanPlayDD.java：

package com.zking.entity;

public class NoCanPlayDD implements PlayDD{
   public void palyDD() {
       System.out.println("不会打豆豆");
   }
}

Person.java：

package com.zking.entity;

public class Person {
   private static Person person;
   private Person(){

   }

   public static Person newInstance(){
       if(person==null){
           person=new Person();
       }
       return person;
   }

}

PlayDD.java：

package com.zking.entity;

public interface PlayDD {
public void palyDD();
}

Student.java：

package com.zking.entity;

public abstract class Student {
   public void eat() {
       System.out.println("吃饭");
   }
   public void sleep() {
       System.out.println("睡觉");
   }
   public abstract void playDD();

}

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