/*** @Description instanceof 和类型转换*/
package com.oop;import com.oop.demo06.Person;
import com.oop.demo06.Student;
import com.oop.demo06.Teacher;public class Application {public static void main(String[] args) {//Object > String//Object > Person > Teacher//Object > Person > StudentObject object = new Student();//System.out.println(X instanceof Y);//能不能编译通过！System.out.println(object instanceof Student);  //trueSystem.out.println(object instanceof Person);   //trueSystem.out.println(object instanceof Object);   //trueSystem.out.println(object instanceof Teacher);   //FalseSystem.out.println(object instanceof String);   //FalseSystem.out.println("=========================");Person person = new Student();System.out.println(person instanceof Student);  //trueSystem.out.println(person instanceof Person);   //trueSystem.out.println(person instanceof Object);   //trueSystem.out.println(person instanceof Teacher);   //False//System.out.println(person instanceof String);   //编译报错System.out.println("=========================");Student student = new Student();System.out.println(student instanceof Student);  //trueSystem.out.println(student instanceof Person);   //trueSystem.out.println(student instanceof Object);   //true//System.out.println(student instanceof Teacher);   //编译报错//System.out.println(student instanceof String);   //编译报错//类型之间的转化：  父   子//高                    低Person obj = new Student();//student将这个对象转换为Student类型，我们就可以使用Student类型的方法了/***      Student student1 = (Student) obj;*      student1.go();*/((Student) obj).go();//子类转换为父类，可能丢失自己的本来的一些方法！Student student2 = new Student();student2.go();//低                   高Person person1 = student2;}}/*选中下一个相同内容的快捷键是：Alt + J选中所有相同内容的快捷键是：Ctrl + Shift + Alt + J*//*1.父类引用指向子类的对象2.把子类转换为父类，向上转型;3.把父类转换为子类，向上转型; 强制转换4.方便方法的调用，减少重复的代码！简介封装、继承、多态！   抽象类，接口*/

/*** @Description instanceof和类型转换*/
package com.oop.demo06;public class Person {public void run(){System.out.println("run");}}

/*** @Description instanceof和类型转换*/
package com.oop.demo06;public class Teacher extends Person{}

/*** @Description instanceof和类型转换*/
package com.oop.demo06;public class Student extends Person{public void go(){System.out.println("go");}}