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public class Student implements Cloneable
{
 int age;
 String name;
 Professor p;
 public Student(int age, String name, Professor p) {
  this.age = age;
  this.name = name;
  this.p = p;
 }
 public Object clone() {
  Student o = null;
  try {
   o = (Student) super.clone();//ObjectÖеÄclone()ʶ±ð³öÄãÒª¸´ÖƵÄÊÇÄÄÒ»¸ö¶ÔÏó¡£
  } catch (Exception e) {
   System.out.println(e.toString());
  }
  return o;
 }
 public static void main(String[] args) {
  Professor p = new Professor(40, "poul");
  Student stu1 = new Student(18, "pitt", p);
  Student stu2 = (Student)stu1.clone();
  stu2.p.name = "wang";//ÐÞ¸ÄѧÉú2ºó£¬²»Ó°ÏìѧÉú1µÄÖµ¡£
  stu2.p.age = 12;
  System.out.println("stu1.p.name=" + stu1.p.name
    + ",stu1.p.age=" + stu1.p.a


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