类型转换

package src.com.qiQi.oop;


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

//测试类
public class Application {
    public static void main(String[] args) {
        Person student = new Student();
        ((Student)student).guAi();
    }
}

/*
    子类
public void guAi(){
        System.out.println("怪!");
    }
    
    父类
    public void run(){
        System.out.println("run");
    }
 */