A class whose clone method uses serialization : Serialization « File Input Output « Java

A class whose clone method uses serialization

   This program is a part of the companion code for Core Java 8th ed.

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.

   @version 1.20 17 Aug 1998
   @author Cay Horstmann

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.Date;
import java.util.GregorianCalendar;

public class SerialCloneTest
   public static void main(String[] args)
      Employee harry = new Employee("Harry Hacker", 35000, 1989, 10, 1);
      // clone harry
      Employee harry2 = (Employee) harry.clone();

      // mutate harry

      // now harry and the clone are different

   A class whose clone method uses serialization.
class SerialCloneable implements Cloneable, Serializable
   public Object clone()
         // save the object to a byte array
         ByteArrayOutputStream bout = new ByteArrayOutputStream();
         ObjectOutputStream out = new ObjectOutputStream(bout);

         // read a clone of the object from the byte array
         ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
         ObjectInputStream in = new ObjectInputStream(bin);
         Object ret = in.readObject();

         return ret;
      catch (Exception e)
         return null;

   The familiar Employee class, redefined to extend the
   SerialCloneable class. 
class Employee extends SerialCloneable
   public Employee(String n, double s, int year, int month, int day)
      name = n;
      salary = s;
      GregorianCalendar calendar = new GregorianCalendar(year, month - 1, day);
      hireDay = calendar.getTime();

   public String getName()
      return name;

   public double getSalary()
      return salary;

   public Date getHireDay()
      return hireDay;

   public void raiseSalary(double byPercent)
      double raise = salary * byPercent / 100;
      salary += raise;

   public String toString()
      return getClass().getName()
         + "[name=" + name
         + ",salary=" + salary
         + ",hireDay=" + hireDay
         + "]";

   private String name;
   private double salary;
   private Date hireDay;


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