ObjectOutput:

The ObjectOutput interface extends the DataOutput interface and supports object serialization. It declares the methods shown in Table 17-5.  Remember especially the writeObject ( ) method. This is known as serialize an object. All of these methods will throw an IOException on error conditions.

Methods                                                                    Description

void close ( )                                 Closes the invoking stream. Further write attempts  will generate an IOException.

void flush ( )                                  Finalized the output state so that any buffers are cleared That is, it flushes the output buffers.

void write (byte buffer [ ])              Writes an array of bytes to the invoking stream.

void write (byte buffer[ ],                Writes a subrange of numBytes bytes

int offset, int num Bytes)                 from the array buffer, beginning at buffer [offset].

void write (int b )                            Writes a single byte to the invoking stream. The Byte written is the low-order byte of b.

void writeObject (Object obj)           Writes object obj to the invoking stream.