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Java > Java SE, EE, ME > java > io > ObjectOutputStream

java.io
Class ObjectOutputStream

java.lang.Object
  extended by java.io.OutputStream
      extended by java.io.ObjectOutputStream
All Implemented Interfaces:
Closeable, DataOutput, Flushable, ObjectOutput, ObjectStreamConstants
See Also:
Top Examples, Source Code, ObjectInputStream, Serializable, Externalizable 
protected void annotateClass(Class<?> cl)
                      throws IOException
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[969]ObjectInputStream and ObjectOutputStream
By Anonymous on 2005/03/04 08:35:12  Rate
ObjectInputStream and ObjectOutputStream. 
  
  
 If you try to execute the following code with a input and output stream that are somehow coupled:  
     localin = new ObjectInputStream ( input_stream ) ; 
     localout= new ObjectOutputStream ( output_stream ) ; 
  
  
 you get some kind of deadlock. The following will work:  
     localout= new ObjectOutputStream ( output_stream ) ; 
     localin = new ObjectInputStream ( input_stream ) ; 
  
  
 

[1827]Deadlock on InputObjectStream
By tim on 2006/09/27 11:52:58  Rate
It deadlock's because the InputObjectStream blocks until it connects to an ObjectOutputStream. 
  
  
 So if both sides wait for a response from the other before proceeding then they'll wait forever. Hence ObjectOutputStream first works. 
  
  
 
protected void annotateProxyClass(Class<?> cl)
                           throws IOException
See Also:
ObjectInputStream.resolveProxyClass(String[])
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public void close()
           throws IOException
See Also:
OutputStream, ObjectOutput, Closeable
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public void defaultWriteObject()
                        throws IOException
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protected void drain()
              throws IOException
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protected boolean enableReplaceObject(boolean enable)
                               throws SecurityException
See Also:
SerializablePermission, SecurityManager.checkPermission(java.security.Permission)
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public void flush()
           throws IOException
See Also:
OutputStream, ObjectOutput, Flushable
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protected ObjectOutputStream()
                      throws IOException,
                             SecurityException
See Also:
SerializablePermission, SecurityManager.checkPermission(java.security.Permission)
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public ObjectOutputStream(OutputStream out)
                   throws IOException
See Also:
ObjectInputStream.ObjectInputStream(InputStream), putFields(), ObjectOutputStream(), NullPointerException, SecurityException
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public ObjectOutputStream.PutField putFields()
                                      throws IOException
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protected Object replaceObject(Object obj)
                        throws IOException
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public void reset()
           throws IOException
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[970]Internal cache and memory leak of Object streams
By Anonymous on 2004/10/01 14:46:22  Rate
Object streams maintain an internal cache of the objects they have already read/written. This means that any object that has been transferred once does not have to be transferred a second time. However, it does not keep track of changes during the lifetime of an object. This means that, if you send an object, make a change in it, and send it again, the other end gets the old object. To ensure correct behaviour, you should use immutable objects or take care that you do not accidentally change the objects.  
 Unfortunately, the object stream does not flush any of its cache, which means that it just keeps growing and growing when you send more objects over it, even if they are never referred to again on the sender's side. This is in fact a kind of memory leak. This means that you have to call the reset (  )  method periodically to ensure that you do not run out of memory. Unfortunately, reset (  )  is too slow to call every time you send an object.  
 
public void useProtocolVersion(int version)
                        throws IOException
See Also:
ObjectStreamConstants.PROTOCOL_VERSION_2, ObjectStreamConstants.PROTOCOL_VERSION_1, IllegalArgumentException, IllegalStateException
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public void write(byte[] buf)
           throws IOException
See Also:
OutputStream.write(byte[], int, int), ObjectOutput, DataOutput
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public void write(byte[] buf,
                  int off,
                  int len)
           throws IOException
See Also:
OutputStream, ObjectOutput, DataOutput
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public void write(int val)
           throws IOException
See Also:
OutputStream, ObjectOutput, DataOutput
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public void writeBoolean(boolean val)
                  throws IOException
See Also:
DataOutput
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public void writeByte(int val)
               throws IOException
See Also:
DataOutput
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public void writeBytes(String str)
                throws IOException
See Also:
DataOutput
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public void writeChar(int val)
               throws IOException
See Also:
DataOutput
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public void writeChars(String str)
                throws IOException
See Also:
DataOutput
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protected void writeClassDescriptor(ObjectStreamClass desc)
                             throws IOException
See Also:
ObjectStreamConstants.PROTOCOL_VERSION_1, useProtocolVersion(int), ObjectInputStream.readClassDescriptor()
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public void writeDouble(double val)
                 throws IOException
See Also:
DataOutput
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public void writeFields()
                 throws IOException
See Also:
NotActiveException
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public void writeFloat(float val)
                throws IOException
See Also:
DataOutput
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public void writeInt(int val)
              throws IOException
See Also:
DataOutput
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public void writeLong(long val)
               throws IOException
See Also:
DataOutput
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public final void writeObject(Object obj)
                       throws IOException
See Also:
NotSerializableException, InvalidClassException, ObjectOutput
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[630]Save object to disc
By B { dot } Carmon Colvin on 2004/02/03 03:06:01  Rate
 
 public void saveObjectToDisc ( Object theObject )   {  
     try 
      {  
       // open the file stream 
       FileOutputStream foStream = new FileOutputStream ( "FileName.obj" ) ; 
       // open the object stream 
       ObjectOutputStream ooStream = new ObjectOutputStream ( foStream ) ; 
       // write object to object stream 
       ooStream.writeObject ( theObject ) ; 
       // flush the object stream 
       ooStream.flush (  ) ; 
       // close the file stream 
       foStream.close (  ) ; 
      }  catch  ( IOException ex )  
      {  
      // handle exceptions here 
      }  
  }  
 
protected void writeObjectOverride(Object obj)
                            throws IOException
See Also:
writeObject(Object), ObjectOutputStream()
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public void writeShort(int val)
                throws IOException
See Also:
DataOutput
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protected void writeStreamHeader()
                          throws IOException
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public void writeUnshared(Object obj)
                   throws IOException
See Also:
InvalidClassException, NotSerializableException
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[1832]ObjectOutputStream Memory Leak
By Anonymous on 2006/10/13 09:04:17  Rate
After writeUnshared, you need to do call reset (  ) ; Otherwise, objects that you've written still have references to them floating around in a table of mappings of handles to the stuff, so garbage collection doesn't kick in.
public void writeUTF(String str)
              throws IOException
See Also:
DataOutput
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