多态(三)

class Fu
{
    int num = 5;
    void method1()
    {
        System.out.println("fu method_1");
    }
    void method2()
    {
        System.out.println("fu method_2");
    }
    static void method4()
    {
        System.out.println("fu method_4");
    }
}


class Zi extends Fu
{
    int num = 8;
    void method1()
    {
        System.out.println("zi method_1");
    }
    void method3()
    {
        System.out.println("zi method_3");
    }

    static void method4()
    {
        System.out.println("zi method_4");
    }
}

Fu f = new Zi();
System.out.println(f.num);//打印5
f.method4();//打印zi method_4