java继承

• Animal.java

package com.nanjing;public class Animal {    protected  int id;    protected String name;    public Animal(int id,String name){        this.id = id;        this.name = name;    }    public void show(){        System.out.println("父类:" + this.id + this.name);    }    public final void hello(){        System.out.println("不允许重写了~");    }}

• Dog.java

package com.nanjing;public class Dog extends Animal{    private String gender;    public Dog(int id,String name,String gender){        super(id, name);        this.gender = gender;    }    public void show(){        System.out.println("子类:" + this.id + this.name + this.gender);        super.show();        super.hello();    }    public static void main(String[] args){        Dog d = new Dog(1,"狗","F");        d.show();    }}