Deep clone Object : Clone « Class Definition « Java Tutorial






/*
 * Copyright (C) 2001-2003 Colin Bell
 * colbell@users.sourceforge.net
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

import java.io.*;
import java.text.NumberFormat;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * General purpose utilities functions.
 *
 * @author <A HREF="mailto:colbell@users.sourceforge.net">Colin Bell</A>
 */
public class Utilities
{
  
  /**
   * Creates a clone of any serializable object. Collections and arrays
   * may be cloned if the entries are serializable.
   *
   * Caution super class members are not cloned if a super class is not serializable.
   */
  public static Object cloneObject(Object toClone, final ClassLoader classLoader)
  {
     if(null == toClone)
     {
        return null;
     }
     else
     {
        try
        {
           ByteArrayOutputStream bOut = new ByteArrayOutputStream();
           ObjectOutputStream oOut = new ObjectOutputStream(bOut);
           oOut.writeObject(toClone);
           oOut.close();
           ByteArrayInputStream bIn = new ByteArrayInputStream(bOut.toByteArray());
           bOut.close();
           ObjectInputStream oIn = new ObjectInputStream(bIn)
           {
              protected Class<?> resolveClass(ObjectStreamClass desc) throws IOException, ClassNotFoundException
              {
                return Class.forName(desc.getName(), false, classLoader);
              }
           };
           bIn.close();
           Object copy = oIn.readObject();
           oIn.close();

           return copy;
        }
        catch (Exception e)
        {
           throw new RuntimeException(e);
        }

     }
  }
}








5.18.Clone
5.18.1.Demonstrate the clone() method.
5.18.2.Override the clone() method.
5.18.3.Copying Objects implements Cloneable
5.18.4.Construct clone of an object
5.18.5.construct clone of an object and call constructor in the super class
5.18.6.public Object clone() throws CloneNotSupportedException
5.18.7.Cast after cloning
5.18.8.Shallow copy then deep copy
5.18.9.Uses serialization to perform deep copy cloning.
5.18.10.Deep clone Object
5.18.11.Deep clone serializing/de-serializng Clone
5.18.12.Serializable Clone
5.18.13.Manipulate properties after clone operation
5.18.14.Clone an object with clone method from parent
5.18.15.Arrays are automatically cloneable
5.18.16.A collection of utilities to workaround limitations of Java clone framework
5.18.17.Copy an serializable object deeply
5.18.18.Clone an array