instanceof关键字和类型转换

package com.study.oop.demo07;

import com.study.oop.demo07.Person;

public class Student extends Person {

    public void run(){
        System.out.println("son run");
    }
}

package com.study.oop.demo07;

public class Person {

    public void go(){
        System.out.println("father go");
    }
}

package com.study.oop;

import com.study.oop.demo07.Person;
import com.study.oop.demo07.Student;
import com.study.oop.demo07.Teacher;


public class Application {

    public static void main(String[] args) {

        Person person = new Student();
        //类型之间的转换：
        //父 转换为 子，高转低，需强制转换
        ((Student)person).run();
        ((Student)person).go();

        //子类 转换为 父类，低转高，会丢失子类的方法
        Student student = new Student();
        Person person1 = student;
        person1.go();
        //person1.run();//方法丢失

        

    }
}