Java Code Examples for java.io.ObjectOutputStream

private static void testSerialization(File testFile) {
    String path = testFile.getPath();
    try {
        // serialize test file
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(baos);
        oos.writeObject(testFile);
        oos.close();
        // deserialize test file
        byte[] bytes = baos.toByteArray();
        ByteArrayInputStream is = new ByteArrayInputStream(bytes);
        ObjectInputStream ois = new ObjectInputStream(is);
        File newFile = (File) ois.readObject();
        // test
        String newPath = newFile.getPath();
        if (!path.equals(newPath)) {
            throw new RuntimeException(
                    "Serialization should not change file path");
        }
        test(newFile, false);
    } catch (IOException | ClassNotFoundException ex) {
        System.err.println("Exception happens in testSerialization");
        System.err.println(ex.getMessage());
    }
}
 

/**
 * Serializes a {@link ModelMBeanConstructorInfo} to an {@link ObjectOutputStream}.
 */
private void writeObject(ObjectOutputStream out)
        throws IOException {
  if (compat)
  {
    // Serializes this instance in the old serial form
    //
    ObjectOutputStream.PutField fields = out.putFields();
    fields.put("consDescriptor", consDescriptor);
    fields.put("currClass", currClass);
    out.writeFields();
  }
  else
  {
    // Serializes this instance in the new serial form
    //
    out.defaultWriteObject();
  }
}
 

/**
 * 将对象储存到sharepreference
 *
 * @param key
 * @param device
 * @param <T>
 */
public static <T> boolean saveDeviceData(Context context, String key, T device) {
    if (mSharedPreferences == null) {
        mSharedPreferences = context.getSharedPreferences(SP_NAME, Context.MODE_PRIVATE);
    }
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    try {   //Device为自定义类
        // 创建对象输出流，并封装字节流
        ObjectOutputStream oos = new ObjectOutputStream(baos);
        // 将对象写入字节流
        oos.writeObject(device);
        // 将字节流编码成base64的字符串
        String oAuth_Base64 = new String(Base64.encode(baos
                .toByteArray(), Base64.DEFAULT));
        mSharedPreferences.edit().putString(key, oAuth_Base64).commit();
        return true;
    } catch (Exception e) {
        e.printStackTrace();
        return false;
    }
}
 

/**
 * Write and read long arrays to/from a stream.  The benchmark is run in
 * batches, with each batch consisting of a fixed number of read/write
 * cycles.  The ObjectOutputStream is reset after each batch of cycles has
 * completed.
 * Arguments: <array size> <# batches> <# cycles per batch>
 */
public long run(String[] args) throws Exception {
    int size = Integer.parseInt(args[0]);
    int nbatches = Integer.parseInt(args[1]);
    int ncycles = Integer.parseInt(args[2]);
    long[][] arrays = new long[ncycles][size];
    StreamBuffer sbuf = new StreamBuffer();
    ObjectOutputStream oout =
        new ObjectOutputStream(sbuf.getOutputStream());
    ObjectInputStream oin =
        new ObjectInputStream(sbuf.getInputStream());

    doReps(oout, oin, sbuf, arrays, 1);     // warmup

    long start = System.currentTimeMillis();
    doReps(oout, oin, sbuf, arrays, nbatches);
    return System.currentTimeMillis() - start;
}
 

public void run() {
    try {
        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
        final ObjectOutputStream oos = new ObjectOutputStream(baos);

        oos.writeObject(vector);
        oos.close();
    } catch (final IOException ioe) {
        addException(ioe);
    } finally {
        try {
            testEnd.await();
        } catch (Exception e) {
            addException(e);
        }
    }
}
 

/**
 * Serialize this {@code CertificateRevokedException} instance.
 *
 * @serialData the size of the extensions map (int), followed by all of
 * the extensions in the map, in no particular order. For each extension,
 * the following data is emitted: the OID String (Object), the criticality
 * flag (boolean), the length of the encoded extension value byte array
 * (int), and the encoded extension value bytes.
 */
private void writeObject(ObjectOutputStream oos) throws IOException {
    // Write out the non-transient fields
    // (revocationDate, reason, authority)
    oos.defaultWriteObject();

    // Write out the size (number of mappings) of the extensions map
    oos.writeInt(extensions.size());

    // For each extension in the map, the following are emitted (in order):
    // the OID String (Object), the criticality flag (boolean), the length
    // of the encoded extension value byte array (int), and the encoded
    // extension value byte array. The extensions themselves are emitted
    // in no particular order.
    for (Map.Entry<String, Extension> entry : extensions.entrySet()) {
        Extension ext = entry.getValue();
        oos.writeObject(ext.getId());
        oos.writeBoolean(ext.isCritical());
        byte[] extVal = ext.getValue();
        oos.writeInt(extVal.length);
        oos.write(extVal);
    }
}
 

/**
 * Serializes the given collection.
 * <p>
 * First writes a <code>int</code> indicating the number of all 
 * serializable elements (implements <code>Serializable</code>, then
 * objects are writtern one by one.</p>
 * 
 * @param oos           the stream where the collection is writtern to
 * @param collection    the collection to serialize
 * @throws IOException if I/O exception occurs
 */
protected final void serialize(ObjectOutputStream oos, Collection collection)
        throws IOException {
    Object array[] = collection.toArray();
    int serCount = 0;
    for (int i = 0; i < array.length; i++) {
        if (array[i] instanceof Serializable) {
            serCount++;
        }
    }

    oos.writeInt(serCount);
    for (int i = 0; i < array.length; i++) {
        if (array[i] instanceof Serializable) {
            oos.writeObject(array[i]);
        }
    }
}
 

public void setParameter(PreparedStatement ps, int i, Object parameter, JdbcType jdbcType) throws SQLException
{
    if (parameter == null)
    {
        ps.setNull(i, SerializableTypeHandler.serializableType);
    }
    else
    {
        try
        {
            ByteArrayOutputStream baos = new ByteArrayOutputStream(1024);
            ObjectOutputStream oos = new ObjectOutputStream(baos);
            oos.writeObject(parameter);
            byte[] bytes = baos.toByteArray();
            ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
            ps.setBinaryStream(i, bais, bytes.length);
        }
        catch (Throwable e)
        {
            throw new SerializationException(e);
        }
    }
}
 

private void writeObject(ObjectOutputStream s) throws IOException {
    Vector<Object> values = new Vector<Object>();

    s.defaultWriteObject();
    // Save the invoker, if its Serializable.
    if(invoker != null && invoker instanceof Serializable) {
        values.addElement("invoker");
        values.addElement(invoker);
    }
    // Save the popup, if its Serializable.
    if(popup != null && popup instanceof Serializable) {
        values.addElement("popup");
        values.addElement(popup);
    }
    s.writeObject(values);

    if (getUIClassID().equals(uiClassID)) {
        byte count = JComponent.getWriteObjCounter(this);
        JComponent.setWriteObjCounter(this, --count);
        if (count == 0 && ui != null) {
            ui.installUI(this);
        }
    }
}
 

/**
 * 将对象储存到sharepreference
 *
 * @param key
 * @param device
 * @param <T>
 */
public static <T> boolean saveDeviceData(Context context, String key, T device) {
    if (mSharedPreferences == null) {
        mSharedPreferences = context.getSharedPreferences(SP_NAME, Context.MODE_PRIVATE);
    }
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    try {   //Device为自定义类
        // 创建对象输出流，并封装字节流
        ObjectOutputStream oos = new ObjectOutputStream(baos);
        // 将对象写入字节流
        oos.writeObject(device);
        // 将字节流编码成base64的字符串
        String oAuth_Base64 = new String(Base64.encode(baos
                .toByteArray(), Base64.DEFAULT));
        mSharedPreferences.edit().putString(key, oAuth_Base64).commit();
        return true;
    } catch (Exception e) {
        e.printStackTrace();
        return false;
    }
}
 

/**
 * Serializes a {@link ModelMBeanAttributeInfo} to an {@link ObjectOutputStream}.
 */
private void writeObject(ObjectOutputStream out)
        throws IOException {
  if (compat)
  {
    // Serializes this instance in the old serial form
    //
    ObjectOutputStream.PutField fields = out.putFields();
    fields.put("attrDescriptor", attrDescriptor);
    fields.put("currClass", currClass);
    out.writeFields();
  }
  else
  {
    // Serializes this instance in the new serial form
    //
    out.defaultWriteObject();
  }
}
 

@Test
public void testNullUpValueStaticSerialization() throws LdapException, IOException, ClassNotFoundException
{
    Ava atav = new Ava( schemaManager, "DC", ( String ) null );

    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    ObjectOutputStream out = new ObjectOutputStream( baos );

    try
    {
        atav.writeExternal( out );
        fail();
    }
    catch ( IOException ioe )
    {
        String message = ioe.getMessage();
        assertEquals( "Cannot serialize a wrong ATAV, the value should not be null", message );
    }
}
 

/**
 * Test serialization of a simple ATAV
 */
@Test
public void testNullAtavSerialization() throws LdapException, IOException, ClassNotFoundException
{
    Ava atav = new Ava();

    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    ObjectOutputStream out = new ObjectOutputStream( baos );

    try
    {
        atav.writeExternal( out );
        fail();
    }
    catch ( IOException ioe )
    {
        assertTrue( true );
    }
}
 

private final void testSerializationAndCloning(Tree node) throws Exception {

		// Serialize
		ByteArrayOutputStream baos = new ByteArrayOutputStream(1024);
		ObjectOutputStream oos = new ObjectOutputStream(baos);
		oos.writeObject(node);
		oos.flush();
		byte[] bytes = baos.toByteArray();
		// System.out.println(new String(bytes));

		// Deserialize
		ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
		ObjectInputStream ois = new ObjectInputStream(bais);
		Tree copy = (Tree) ois.readObject();

		String txtOriginal = node.toString("debug");
		String txtCopy = copy.toString("debug");

		assertEquals(txtOriginal, txtCopy);

		// Cloning
		txtCopy = node.clone().toString("debug");
		assertEquals(txtOriginal, txtCopy);
	}
 

/**
 * Serialize an instance, restore it, and check for equality.
 */
public void testSerialization() {
    // test a default instance
    DialValueIndicator i1 = new DialValueIndicator(0, "Label");
    DialValueIndicator i2 = null;

    try {
        ByteArrayOutputStream buffer = new ByteArrayOutputStream();
        ObjectOutput out = new ObjectOutputStream(buffer);
        out.writeObject(i1);
        out.close();

        ObjectInput in = new ObjectInputStream(
                new ByteArrayInputStream(buffer.toByteArray()));
        i2 = (DialValueIndicator) in.readObject();
        in.close();
    }
    catch (Exception e) {
        e.printStackTrace();
    }
    assertEquals(i1, i2);
    
    // test a custom instance
}
 

public XViewBody deepClone() {


        try {
            ByteArrayOutputStream bo = new ByteArrayOutputStream();
            ObjectOutputStream oo = new ObjectOutputStream(bo);
            oo.writeObject(this);
            ByteArrayInputStream bi = new ByteArrayInputStream(bo.toByteArray());
            ObjectInputStream oi = new ObjectInputStream(bi);
            Object o = oi.readObject();
            oi.close();
            bi.close();
            return (XViewBody) o;
        } catch (Exception e) {
            e.printStackTrace();
        }

        return null;

    }
 

/**
 * Serializes an object and writes it to the disk.
 * <p>The file written will match the pattern "KEYNAME_CLASSNAME.ser"</p>
 * 
 * @param theKey the key name associated with the object
 * @param theObject the object to serialize
 * @return true if the operation completed successfully
 */
public static final <E extends Serializable> boolean serializeToDisk(final String theKey, final E theObject) {
	boolean succeeded;
	try {
		final File file = new File(theKey + "_" + theObject.getClass().getSimpleName() + ".ser");
		if (!file.exists()) {
			file.createNewFile();
		}
		ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(file));
		oos.writeObject(theObject);
		oos.close();
		succeeded = true;
	} catch (final Exception theException) {
		//System.err.println(theException.getMessage());
		succeeded = false;
	}
	return succeeded;
}
 

/**
     * Save the {@code BigInteger} instance to a stream.
     * The magnitude of a BigInteger is serialized as a byte array for
     * historical reasons.
     *
     * @serialData two necessary fields are written as well as obsolete
     *             fields for compatibility with older versions.
     */
    private void writeObject(ObjectOutputStream s) throws IOException {
        // set the values of the Serializable fields
        ObjectOutputStream.PutField fields = s.putFields();
        fields.put("signum", signum);
        fields.put("magnitude", magSerializedForm());
        // The values written for cached fields are compatible with older
        // versions, but are ignored in readObject so don't otherwise matter.
        fields.put("bitCount", -1);
        fields.put("bitLength", -1);
        fields.put("lowestSetBit", -2);
        fields.put("firstNonzeroByteNum", -2);

        // save them
        s.writeFields();
}
 

/**
 * Used by writeObject to serialize a Collection.
 * @param oos the {@code ObjectOutputStream}
 * to use during serialization
 * @param coll the {@code Collection} to serialize
 * @throws IOException if serialization failed
 */
protected final void serialize(ObjectOutputStream oos, Collection<?> coll) throws IOException {
    int      count   = 0;
    Object[] objects = coll.toArray();

    for (int i = 0; i < objects.length; i++) {
        if (objects[i] instanceof Serializable)
            count++;
        else
            objects[i] = null;
    }

    oos.writeInt(count); // number of subsequent objects

    for (int i = 0; count > 0; i++) {
        Object o = objects[i];

        if (o != null) {
            oos.writeObject(o);
            count--;
        }
    }
}
 

/**
 * Write and read int arrays to/from a stream.  The benchmark is run in
 * batches, with each batch consisting of a fixed number of read/write
 * cycles.  The ObjectOutputStream is reset after each batch of cycles has
 * completed.
 * Arguments: <array size> <# batches> <# cycles per batch>
 */
public long run(String[] args) throws Exception {
    int size = Integer.parseInt(args[0]);
    int nbatches = Integer.parseInt(args[1]);
    int ncycles = Integer.parseInt(args[2]);
    int[][] arrays = new int[ncycles][size];
    StreamBuffer sbuf = new StreamBuffer();
    ObjectOutputStream oout =
        new ObjectOutputStream(sbuf.getOutputStream());
    ObjectInputStream oin =
        new ObjectInputStream(sbuf.getInputStream());

    doReps(oout, oin, sbuf, arrays, 1);     // warmup

    long start = System.currentTimeMillis();
    doReps(oout, oin, sbuf, arrays, nbatches);
    return System.currentTimeMillis() - start;
}
 

/**
 * @serialData "permissions" field (a Vector containing the SocketPermissions).
 */
/*
 * Writes the contents of the perms field out as a Vector for
 * serialization compatibility with earlier releases.
 */
private void writeObject(ObjectOutputStream out) throws IOException {
    // Don't call out.defaultWriteObject()

    // Write out Vector
    Vector<SocketPermission> permissions = new Vector<>(perms.size());

    synchronized (this) {
        permissions.addAll(perms);
    }

    ObjectOutputStream.PutField pfields = out.putFields();
    pfields.put("permissions", permissions);
    out.writeFields();
}
 

protected byte[] objectToByte(Object obj){
    byte[] bytes; 
    if (obj instanceof String){
        bytes = ((String)obj).getBytes();
    } else if (obj instanceof byte[]){
        bytes = (byte[]) obj;
    } else {
        try { 
            //object to bytearray 
            ByteArrayOutputStream bo = new ByteArrayOutputStream(); 
            ObjectOutputStream oo = new ObjectOutputStream(bo); 
            oo.writeObject(obj); 
            bytes = bo.toByteArray(); 
            bo.close(); 
            oo.close();     
        } 
        catch(Exception e){ 
            throw new RuntimeException(e);
        } 
    }
    return(bytes); 
}
 

/**
 * Serializes a {@link RoleUnresolved} to an {@link ObjectOutputStream}.
 */
private void writeObject(ObjectOutputStream out)
        throws IOException {
  if (compat)
  {
    // Serializes this instance in the old serial form
    //
    ObjectOutputStream.PutField fields = out.putFields();
    fields.put("myRoleName", roleName);
    fields.put("myRoleValue", roleValue);
    fields.put("myPbType", problemType);
    out.writeFields();
  }
  else
  {
    // Serializes this instance in the new serial form
    //
    out.defaultWriteObject();
  }
}
 

/**
 * Serializes a {@link RoleInfo} to an {@link ObjectOutputStream}.
 */
private void writeObject(ObjectOutputStream out)
        throws IOException {
  if (compat)
  {
    // Serializes this instance in the old serial form
    //
    ObjectOutputStream.PutField fields = out.putFields();
    fields.put("myName", name);
    fields.put("myIsReadableFlg", isReadable);
    fields.put("myIsWritableFlg", isWritable);
    fields.put("myDescription", description);
    fields.put("myMinDegree", minDegree);
    fields.put("myMaxDegree", maxDegree);
    fields.put("myRefMBeanClassName", referencedMBeanClassName);
    out.writeFields();
  }
  else
  {
    // Serializes this instance in the new serial form
    //
    out.defaultWriteObject();
  }
}
 

/**
 * Encodes Object into String encoded in HEX format
 * @param value Object, which will be encoded
 * @return  serialized Object in String encoded in HEX format
 * @throws IOException
 */
static String encodeValue(Object value) throws IOException {
    ByteArrayOutputStream bos = new ByteArrayOutputStream();

    try {
        ObjectOutputStream oos = new ObjectOutputStream(bos);
        oos.writeObject(value);
        oos.close();
    } catch (Exception e) {
        throw (IOException) ExternalUtil.copyAnnotation(new IOException(), e);
    }

    byte[] bArray = bos.toByteArray();
    StringBuffer strBuff = new StringBuffer(bArray.length * 2);

    for (int i = 0; i < bArray.length; i++) {
        if ((bArray[i] < 16) && (bArray[i] >= 0)) {
            strBuff.append("0"); // NOI18N
        }

        strBuff.append(Integer.toHexString((bArray[i] < 0) ? (bArray[i] + 256) : bArray[i]));
    }

    return strBuff.toString();
}
 

private void writeObject(ObjectOutputStream s) throws IOException {
    s.defaultWriteObject();
    
    // Save serializable event listeners
    int priority = listenersArray.length - 1; // max priority
    s.writeInt(priority); // write max priority
    for (; priority >= 0; priority--) {
        T[] listeners = listenersArray[priority];
        // Write in opposite order of adding 
        for (int i = 0; i < listeners.length; i++) {
            T listener = listeners[i];
            // Save only the serializable listeners
            if (listener instanceof Serializable) {
                s.writeObject(listener);
            }
        }
        s.writeObject(null);
    }
}
 

public static byte[] serialize(Serializable obj)
{
    try
    {
        try(ByteArrayOutputStream out = new ByteArrayOutputStream();
            ObjectOutputStream objStream = new ObjectOutputStream(out);)
        {
            objStream.writeObject(obj);
            return out.toByteArray();
        }
    }
    catch(Exception ex)
    {
        throw new RuntimeException("Failed to serialize Object of type "
                                   + (obj == null ? "null" : obj.getClass().getName()), ex);
    }
}
 

public WireIO createWireIOClient(Socket clientSocket) {
    try {
        clientSocket.setSoTimeout(0);
        clientSocket.setTcpNoDelay(true); // Necessary at least on Solaris to avoid delays in e.g. readInt() etc.

        ObjectOutputStream socketOut = new ObjectOutputStream(clientSocket.getOutputStream());
        ObjectInputStream socketIn = new ObjectInputStream(clientSocket.getInputStream());
        WireIO wireIO = new WireIO(socketOut, socketIn);

        return wireIO;
    } catch (IOException ex) {
        ex.printStackTrace();
    }

    return null;
}
 

/**
 * @serialData the expected values per key, the number of distinct keys,
 * the number of entries, and the entries in order
 */
@GwtIncompatible("java.io.ObjectOutputStream")
private void writeObject(ObjectOutputStream stream) throws IOException {
  stream.defaultWriteObject();
  stream.writeInt(valueSetCapacity);
  stream.writeInt(keySet().size());
  for (K key : keySet()) {
    stream.writeObject(key);
  }
  stream.writeInt(size());
  for (Map.Entry<K, V> entry : entries()) {
    stream.writeObject(entry.getKey());
    stream.writeObject(entry.getValue());
  }
}
 

private byte[] writeObject(Object object) throws IOException {
	ByteArrayOutputStream baos = new ByteArrayOutputStream();
       ObjectOutput out = new ObjectOutputStream(baos);
	out.writeObject(object);
       out.close();
	return baos.toByteArray();
}
 

/**
 * Serializes a message into cluster data
 * 
 * @param msg
 *            ClusterMessage
 * @return serialized content as byte[] array
 * @throws IOException
 */
public static byte[] serialize(Serializable msg) throws IOException {
	ByteArrayOutputStream outs = new ByteArrayOutputStream();
	ObjectOutputStream out = new ObjectOutputStream(outs);
	out.writeObject(msg);
	out.flush();
	byte[] data = outs.toByteArray();
	return data;
}
 

/**
 * Writes a serialized representation of an arbitrary Java object to 
 * a file. Make sure the serialized object is composed of standard Java types 
 * only to avoid class loader problems.
 *  
 * @param any The object to be serialized.
 * @param fileName The file to write to.
 * @return The full path of the written file.
 */
public static String writeObject(Object any, String fileName) {
	File file = new File(fileName);
	String path = file.getAbsolutePath();
	try (FileOutputStream strm = new FileOutputStream(file);
		 OutputStream buffer = new BufferedOutputStream(strm);
		 ObjectOutput output = new ObjectOutputStream(buffer);) 
	{
		output.writeObject(any);
	} catch (IOException e) {
		System.err.println("Output error.");
		return null;
	}
	return path;
}
 

private void writeObject(
    ObjectOutputStream  out)
    throws IOException
{
    out.writeObject(this.getY());
    out.writeObject(elSpec.getP());
    out.writeObject(elSpec.getG());
}
 

@SuppressWarnings("unchecked")
protected <T> T serializeDeserializeObject(T o)
        throws IOException, ClassNotFoundException {
    T o1;
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    try (ObjectOutputStream oos = new ObjectOutputStream(baos)) {
        oos.writeObject(o);
    }
    try (ObjectInputStream ois
            = new ObjectInputStream(new ByteArrayInputStream(baos.toByteArray()))) {
        o1 = (T) ois.readObject();
    }
    return o1;
}
 

static byte [] pickleXPE(XPathException xpe) throws IOException {
    ByteArrayOutputStream bos =  new ByteArrayOutputStream();
    ObjectOutputStream xpeos = new ObjectOutputStream(bos);
    xpeos.writeObject(xpe);
    xpeos.close();
    return bos.toByteArray();
}
 

static ByteString writeObject2ByteString(Object obj) {
  final ByteString.Output byteOut = ByteString.newOutput();
  try(final ObjectOutputStream objOut = new ObjectOutputStream(byteOut)) {
    objOut.writeObject(obj);
  } catch (IOException e) {
    throw new IllegalStateException(
        "Unexpected IOException when writing an object to a ByteString.", e);
  }
  return byteOut.toByteString();
}
 

private void sendResponse(ObjectOutputStream out, Object response)
		throws IOException {
	out.writeObject(response);
	out.flush();
	System.out.println("sending response to client-app...");
	System.out.println(response);
}
 

private void writeObject(ObjectOutputStream out) throws IOException {
    out.writeObject(cookie.name());
    out.writeObject(cookie.value());
    out.writeLong(cookie.persistent() ? cookie.expiresAt() : NON_VALID_EXPIRES_AT);
    out.writeObject(cookie.domain());
    out.writeObject(cookie.path());
    out.writeBoolean(cookie.secure());
    out.writeBoolean(cookie.httpOnly());
    out.writeBoolean(cookie.hostOnly());
}
 

/**
 * See <code>readObject</code> and <code>writeObject</code> in
 * <code>JComponent</code> for more
 * information about serialization in Swing.
 */
private void writeObject(ObjectOutputStream s) throws IOException {
    s.defaultWriteObject();
    if (getUIClassID().equals(uiClassID)) {
        byte count = JComponent.getWriteObjCounter(this);
        JComponent.setWriteObjCounter(this, --count);
        if (count == 0 && ui != null) {
            ui.installUI(this);
        }
    }
}
 

/**
 * Provides serialization support.
 *
 * @param stream  the output stream.
 *
 * @throws IOException  if there is an I/O error.
 */
private void writeObject(ObjectOutputStream stream) throws IOException {
    stream.defaultWriteObject();
    SerialUtilities.writeShape(this.upArrow, stream);
    SerialUtilities.writeShape(this.downArrow, stream);
    SerialUtilities.writeShape(this.leftArrow, stream);
    SerialUtilities.writeShape(this.rightArrow, stream);
}