public class Student implements Cloneable 
{ 
  String name; 
 int age; 
  Student(String name,int age) 
  { 
  this.name=name; 
  this.age=age; 
  } 
 public Object clone() 
  { 
   Object o=null; 
  try 
   { 
   o=(Student)super.clone();//Object 中的clone()识别出你要复制的是哪一个对象。 
   } 
  catch(CloneNotSupportedException e) 
   { 
    System.out.println(e.toString()); 
   } 
  return o; 
  }  
 
 public static void main(String[] args) 
  { 
  Student s1=new Student("zhangsan",18); 
  Student s2=(Student)s1.clone(); 
  s2.name="lisi"; 
  s2.age=20; 
  //修改学生2后，不影响学生1的值。
  System.out.println("name="+s1.name+","+"age="+s1.age); 
  System.out.println("name="+s2.name+","+"age="+s2.age);
 }
} 

class Professor 
{ 
  String name; 
  int age; 
  Professor(String name,int age) 
  { 
  this.name=name; 
  this.age=age; 
  } 
} 
public class Student implements Cloneable 
{ 
  String name;// 常量对象。 
  int age; 
  Professor p;// 学生1和学生2的引用值都是一样的。 
  Student(String name,int age,Professor p) 
  { 
  this.name=name; 
  this.age=age; 
  this.p=p; 
  } 
 public Object clone() 
  { 
   Student o=null; 
  try 
   { 
    o=(Student)super.clone(); 
   } 
  catch(CloneNotSupportedException e) 
   { 
    System.out.println(e.toString()); 
   } 
   o.p=(Professor)p.clone(); 
  return o; 
  }  
 public static void main(String[] args) 
 { 
  Professor p=new Professor("wangwu",50); 
  Student s1=new Student("zhangsan",18,p); 
  Student s2=(Student)s1.clone(); 
  s2.p.name="lisi"; 
  s2.p.age=30;  
  System.out.println("name="+s1.p.name+","+"age="+s1.p.age);
  System.out.println("name="+s2.p.name+","+"age="+s2.p.age);
  //输出结果学生1和2的教授成为lisi,age为30。
  } 
} 

class Professor implements Cloneable 
{ 
  String name; 
  int age; 
  Professor(String name,int age) 
  { 
  this.name=name; 
  this.age=age; 
  } 
 public Object clone() 
  { 
   Object o=null; 
  try 
   { 
    o=super.clone(); 
   } 
  catch(CloneNotSupportedException e) 
   { 
    System.out.println(e.toString()); 
   } 
  return o; 
  } 
} 
public class Student implements Cloneable 
{ 
  String name; 
  int age; 
  Professor p; 
  Student(String name,int age,Professor p) 
  { 
  this.name=name; 
  this.age=age; 
  this.p=p; 
  } 
 public Object clone() 
  { 
   Student o=null; 
  try 
   { 
    o=(Student)super.clone(); 
   } 
  catch(CloneNotSupportedException e) 
   { 
    System.out.println(e.toString()); 
   } 
   //对引用的对象也进行复制
   o.p=(Professor)p.clone(); 
  return o; 
  }  
 public static void main(String[] args) 
  { 
  Professor p=new Professor("wangwu",50); 
  Student s1=new Student("zhangsan",18,p); 
  Student s2=(Student)s1.clone(); 
  s2.p.name="lisi"; 
  s2.p.age=30; 
  //学生1的教授不 改变。
  System.out.println("name="+s1.p.name+","+"age="+s1.p.age); 
  System.out.println("name="+s2.p.name+","+"age="+s2.p.age); 
 } 
} 

public Object deepClone() 
{ 
 //将对象写到流里 
 ByteArrayOutoutStream bo=new ByteArrayOutputStream(); 
 ObjectOutputStream oo=new ObjectOutputStream(bo); 
 oo.writeObject(this); 
 //从流里读出来 
 ByteArrayInputStream bi=new ByteArrayInputStream(bo.toByteArray()); 
 ObjectInputStream oi=new ObjectInputStream(bi); 
 return(oi.readObject()); 
} 

class Teacher implements Serializable{
  String name;
  int age;
  public void Teacher(String name,int age){
  this.name=name;
  this.age=age;
  }
}
public class Student implements Serializable{
 String name;//常量对象
 int age;
 Teacher t;//学生1和学生2的引用值都是一样的。
 public void Student(String name,int age,Teacher t){
  this.name=name;
  this.age=age;
  this.p=p;
 }
 public Object deepClone() throws IOException,
    OptionalDataException,ClassNotFoundException{//将对象写到流里
  ByteArrayOutoutStream bo=new ByteArrayOutputStream();
  ObjectOutputStream oo=new ObjectOutputStream(bo);
  oo.writeObject(this);//从流里读出来
  ByteArrayInputStream bi=new ByteArrayInputStream(bo.toByteArray());
  ObjectInputStream oi=new ObjectInputStream(bi);
  return(oi.readObject());
 }
 public static void main(String[] args){ 
  Teacher t=new Teacher("tangliang",30);
  Student s1=new Student("zhangsan",18,t);
  Student s2=(Student)s1.deepClone();
  s2.t.name="tony";
  s2.t.age=40;
  //学生1的老师不改变
  System.out.println("name="+s1.t.name+","+"age="+s1.t.age);
 }
}