java 子类 父类 求代码

Question

Answer 1

 package demo0;

public abstract class DongWu {

    int age;

    abstract void info();

}

 package demo0;

public class Bird extends DongWu{

    String color;

    public Bird(String color,int age){
        this.color = color;
        super.age = age;
    }
    @Override
    void info() {
        System.out.println("我是一只"+this.color+"的鸟!");
        System.out.println("今年"+super.age+"岁了!");
    }
}

 package demo0;

public class Fish extends DongWu{

    int weight;

    public Fish(int weight,int age){
        this.weight = weight;
        super.age = age;
    }
    @Override
    void info() {
        System.out.println("我是一只"+this.weight+"斤重的鱼!");
        System.out.println("今年"+super.age+"岁了!");
    }

}

 package demo0;

public class Test {

    public static void main(String[] args) {
        DongWu bird = new Bird("黄色",4);
        bird.info();
        DongWu fish = new Fish(5,2);
        fish.info();
    }
}