java中的Person、Student和GoodStudent類的繼承

package com.itheima;

/**
 * 9、
 * 有這樣三個(gè)類，Person,Student.GoodStudent。其中Student繼承了Person,GoodStudent繼承了Student,
 * 三個(gè)類中只有默認(rèn)的構(gòu)造函數(shù)，用什么樣的方法證明在創(chuàng)建Student類的對(duì)象的時(shí)候是否調(diào)用了Person的構(gòu)造函數(shù)，
 * 在創(chuàng)建GoodStudent類的對(duì)象的時(shí)候是否調(diào)用了Student構(gòu)造函數(shù)？如果在創(chuàng)建Student對(duì)象的時(shí)候沒有調(diào)用Person的構(gòu)造函數(shù)
 * ，那么采用什么樣的手段可以調(diào)用父類的構(gòu)造函數(shù)？
 * 
 * @author 281167413@qq.com
 */

public class Test9 {

	public static void main(String[] args) {
		Student s1 = new Student();
		System.out.println("-------------------------------");
		Student s2 = new Student();
		System.out.println("-------------------------------");
		GoodStudent g1 = new GoodStudent();
		System.out.println("-------------------------------");
	}

}

class Person {

	Person() {
		System.out.println("I'm Person!");
	}

	Person(String arg) {
		System.out.println(arg);
	}

	Person(String arg1, String arg2) {
		System.out.println(arg1 + arg2);
	}
}

class Student extends Person {

	Student() {
		super("have arg!"); //
		System.out.println("I'm Student!");
	}

	Student(String arg) {
		super("have arg!", "in Person");
		System.out.println(arg);
	}
}

class GoodStudent extends Student {

	GoodStudent() {
		super("from GoodStudent!");
		System.out.println("I'm GoodStudent!");
	}

}

have arg!
I'm Student!
-------------------------------
have arg!
I'm Student!
-------------------------------
have arg!in Person
from GoodStudent!
I'm GoodStudent!
-------------------------------