继承—Monkey

 public class Monkey {
     public void Monkey(String s){

     }
     public void speak(){
         System.out.println("吱……吱……");
     }

 }

 public class People extends Monkey {

     public void speak(){
         System.out.println("小样儿，不错嘛，会说话了");
     }

     public void think(){
         System.out.println("别说话！认真思考！");
     }

 }

 public class TextMP {

     public static void main(String[] args) {

         Monkey m=new Monkey();
         m.speak();

         People p=new People();
         p.speak();
         p.think();

     }

 }

结果：