package demo;

public class xf3 {
    public static void main(String[] args) {
        // 创建Student类的对象
        Student stu = new Student();
        stu.population();
        stu.tell();

        // 创建Person类的对象
        Person per = new Person();
        per.population();
    }
}

// 父类 Person
class Person {
    float popu = 13.7F;
    static double accPopu = 1370536875;

    public void population() {
        System.out.println("全国人口为" + accPopu + "人,大约为" + popu + "亿");
    }

    public void tell() {
        System.out.println("全国人口为" + accPopu + "人,大约为" + popu + "亿");
    }
}

// 子类 Student 继承 Person
class Student extends Person {
    // 隐藏父类的popu变量
    float popu = 1.08F;
    // 隐藏父类的accPopu变量
    static double accPopu = 108640700;

    // 重写父类的population()方法
    public void population() {
        System.out.println("全国学生人数为" + accPopu + "人,大约为" + popu + "亿");
    }
}