Java的深拷贝和浅拷贝(2)

上一篇文章讲述了浅拷贝和深拷贝的含义，并且给出了浅拷贝的一个例子
这篇文章在那个例子的实现上作出修改，实现深拷贝,代码如下：
package com.test;
public class CloneTest
{
public static void main(String[] args)
{
Student s1 = new Student();
s1.setAge(20);
s1.setName("wudi");
School school = new School();
school.setName("Peiyang University");
school.setBornYear(1895);
s1.setSchool(school);
System.out
.println("s1:" + s1.getName() + " " + s1.getAge() + " "
+ s1.getSchool().getName() + " "
+ s1.getSchool().getBornYear());

try
{
//拷贝一个学生
Student s2 = (Student)s1.clone();
s2.setAge(21);
s2.setName("WUDI");
System.out
.println("s2:" + s2.getName() + " " + s2.getAge() + " "
+ s2.getSchool().getName() + " "
+ s2.getSchool().getBornYear());

System.out.println("after s2 changing some property:");
//通过学生s2改变了他所在学校的名称和成立时间
s2.getSchool().setName("Tianjin University");
s2.getSchool().setBornYear(1951);


System.out
.println("s1:" + s1.getName() + " " + s1.getAge() + " "
+ s1.getSchool().getName() + " "
+ s1.getSchool().getBornYear());
System.out
.println("s2:" + s2.getName() + " " + s2.getAge() + " "
+ s2.getSchool().getName() + " "
+ s2.getSchool().getBornYear());




}
catch (CloneNotSupportedException e)
{
e.printStackTrace();
}
}
}
class School implements Cloneable
{
private String name;
private int bornYear;
public String getName()
{
return name;
}
public void setName(String name)
{
this.name = name;
}
public int getBornYear()
{
return bornYear;
}
public void setBornYear(int bornYear)
{
this.bornYear = bornYear;
}

@Override
protected Object clone() throws CloneNotSupportedException
{
return super.clone();
}
}
class Student implements Cloneable
{
private int age;
private String name;
private S