package top.qaqaq.java.P291;
/*
 * 建立InstanceTest 类，在类中定义方法method(Person e);
	在method中:
	(1)根据e的类型调用相应类的getInfo()方法。
	(2)根据e的类型执行：
	如果e为Person类的对象，输出：
	“a person”;
	如果e为Student类的对象，输出：
	“a student”
	“a person ” 
	如果e为Graduate类的对象，输出：
	“a graduated student”
	“a student”
	“a person” 
 * 
 * 
 * 
 * 
 * 
 * 
 */
public class InstanceTest {

	public static void main(String[] args) {
		
		//虚拟方法调用
		InstanceTest test = new InstanceTest();
		test.method(new Student());
	}
	
	public void method(Person e) {
		
		String info = e.getInfo();
		System.out.println(info);
		
		//方式一
//		if (e instanceof Graduate) {
//			System.out.println("a graduated student");
//			System.out.println("a student");
//			System.out.println("a person");
//		}else if(e instanceof Student) {
//			System.out.println("a student");
//			System.out.println("a person");
//		}else {
//			System.out.println("a person");
//		}
		
		//方式二
		if (e instanceof Graduate) {
			System.out.println("a graduated student");
		}
		if (e instanceof Student) {
			System.out.println("a student");
		}
		if (e instanceof Person) {
			System.out.println("a person");
		}
	}
}

class Person {

	protected String name = "person";

	protected int age = 50;

	public String getInfo() {

		return "Name: " + name + "\n" + "age: " + age;

	}
}

class Student extends Person {

	protected String school = "pku";

	public String getInfo() {

		return "Name: " + name + "\nage: " + age

				+ "\nschool: " + school;

	}
}

class Graduate extends Student {

	public String major = "IT";

	public String getInfo()

	{

		return "Name: " + name + "\nage: " + age

				+ "\nschool: " + school + "\nmajor:" + major;

	}
}