十一、instanceof和类型转换
public class Demo02 { public static void main(String[] args) { //Object>Person>Student //Object>Person>Teacher //Object>String Object object = new Student(); System.out.println(object instanceof Student); System.out.println(object instanceof Person); System.out.println(object instanceof Object); System.out.println(object instanceof Teacher); System.out.println(object instanceof String); System.out.println(=======================); Person person = new Student(); System.out.println(person instanceof Student); System.out.println(person instanceof Person); System.out.println(person instanceof Object); System.out.println(person instanceof Teacher); //System.out.println(person instanceof String);//编译报错 System.out.println(=======================); Student student = new Student(); System.out.println(student instanceof Student); System.out.println(student instanceof Person); System.out.println(student instanceof Object); //System.out.println(student instanceof Teacher);//编译报错 //System.out.println(person instanceof String);//编译报错 } }