instanceof

package src.com.qiQi.oop;

import src.com.qiQi.oop.Demo08.Person;
import src.com.qiQi.oop.Demo08.Student;
import src.com.qiQi.oop.Demo08.Teacher;

//测试类
public class Application {
    public static void main(String[] args) {
        Object object = new Student();

        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("=======");

        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);//编译报错
        System.out.println("=======");



    }
}