Java 面向对象之继承篇详解原理与特点

public class Cat extends Animal{}//猫继承动物类

public class fu{
  public void  play(){
   System.out.println("fu喜欢打羽毛球");
  }
}

public class  zi extends fu{
    public void play(){//对父类的方法重写
   System.out.println("zi喜欢打篮球");
    }
} 

public class fu{
   void eat(){
   System.out.println("fu中eat方法");
  }
}

 
public class Zi extends Fu {
    @Override//检测方法重写的正确性
   public void eat() {
        System.out.println("zi中的eat方法");
    }
}

 
public class Zi extends Fu {
   // @Override写不写不会影响，这个只是起到辅助作用
   void eat() {
        System.out.println("zi中的eat方法");
    }
}

 
public class Zi extends Fu {
    @Override
  protected  void eat() {
        System.out.println("zi中的eat方法");
    }
}

 
public class fu{
  public int age=40; 
public fu(){}//无参构造
public fu(int age){//带参构造
  this.age=age;}
  public void eat(){
   System.out.println("fu中eat方法");
  }
}
 
public class Zi extends Fu {
  public  int age=18;
public Zi(){}
public Zi(int age){
  this.age=age;}
    public void eat() {
      super.eat();
        System.out.println("zi中的eat方法");
    }
public void show(){
  int age=1;
  System.out.println(age);//1局部变量的值
  System.out.println(this.age);//18子类成员中的值
  System.out.println(super.age);//40父类中的值
}
 
public class Demo{
  public static void main(String[] args){
    zi z=new zi();
     z.eat();
     z.show();
  }
 
}