package com.oop;

import com.oop.demo04.Person;
import com.oop.demo04.Student;
import com.oop.demo04.Teacher;

/**
 * <p>
 *
 * </p>
 *
 * @author: wfs
 * @date: 2021/6/21
 */
public class Application {
    public static void main(String[] args) {
        //Object > String
        //Object >Person>Teacher
        
 
//Object > Person>Student
       Object object = new Student();
        //System.out.println("X instanceof Y");編譯能不能過,取決於存不存在父子關係
        //結果取決於X所指向的實際型別是否為Y的子型別
        System.out.println(object instanceof  Student);//true
        System.out.println(object instanceof Person);//true
        System.out.println(object instanceof
 
  Object);//true
        System.out.println(object instanceof Teacher);//false
        System.out.println(object instanceof  String);//false
        System.out.println("=====================");

        Student student = new Student();
        System.out.println(student instanceof  Student);//true
        System.out.println(student instanceof
 
 Person);//true
        System.out.println(student instanceof  Object);//true
        //System.out.println(student instanceof Teacher);//編譯錯誤
       // System.out.println(student instanceof  String);//編譯錯誤
        System.out.println("=====================");

        Person person = new Student();
        System.out.println(person instanceof  Student);//true
        System.out.println(person instanceof Person);//true
        System.out.println(person instanceof  Object);//true
        System.out.println(person instanceof Teacher);//false
       // System.out.println(person instanceof  String);//編譯錯誤
        System.out.println("=====================");
    }
}