多态练习

package com.hspedu.encap;
//测试类
public class test {
    public static void main(String[] args) {
        Sub s = new Sub();
        System.out.println(s.count);

        s.display();

        Base b = s;
        System.out.println(b == s);
        System.out.println(b.count);
        b.display();

    }
}

class Base { //父类
    int count = 10;
    public void display() {
        System.out.println(this.count);
    }
}

class Sub extends Base{
    int count = 20;
    public void display() {
        System.out.println(this.count);
    }
}