java:面向对象（继承的练习①）

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public class Test1_Extends {
    public static void main(String[] args) {
        Zi z = new Zi();
        z.show();
    }
}

class Fu{
    public int num = 10;
    public Fu(){
        System.out.println("fu");
    }
}
class Zi extends Fu{
    public int num = 20;
    public Zi(){
        //super();//隐式的调用父类构造方法
        System.out.println("zi");
    }
    public void show(){
        int num = 30;
        System.out.println(num);
        System.out.println(this.num);
        System.out.println(super.num);
    }
}

执行结果：

fu
zi
30
20
10