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public static Object copy(Object oldObj) {   
    Object obj = null;   
    try {   
        // Write the object out to a byte array   
        ByteArrayOutputStream bos = new ByteArrayOutputStream();   
        ObjectOutputStream out = new ObjectOutputStream(bos);   
        out.writeObject(oldObj);   
        out.flush();   
        out.close();   
  
        // Retrieve an input stream from the byte array and read   
        // a copy of the object back in.   
        ByteArrayInputStream bis = new ByteArrayInputStream(bos.toByteArray());    
        ObjectInputStream in = new ObjectInputStream(bis);   
        obj = in.readObject();   
    } catch (IOException e) {   
        e.printStackTrace();   
    } catch (ClassNotFoundException cnfe) {   
        cnfe.printStackTrace();   
    }   
    return obj;   
}