java之instanceof操作符

a intanceof A：判断a是否是类A的的一个实例，返回值为boolean

public class Person extends Object{}

public class Student extends Person{}

public class Graduate extends Person{}

public class Main {

    public static void main(String[] args) {

        Person p = new Person();

        Student s = new Student();

        Graduate g = new Graduate();

        System.out.println(p instanceof Person);

        System.out.println(s instanceof Person);

        System.out.println(g instanceof Person);

    }

}

输出：

true

巴特西

java之instanceof操作符

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