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## java.io
Interface ObjectOutput

All Superinterfaces:
  DataOutput

All Known Implementing Classes:
  ObjectOutputStream

    public interface ObjectOutput

extends DataOutput

ObjectOutput extends the DataOutput interface to include writing of objects. DataOutput includes methods for output of primitive types, ObjectOutput extends that interface to include objects, arrays, and Strings.

Since:
  JDK1.1
See Also:
  `InputStream`, `ObjectOutputStream`, `ObjectInputStream`

Method Summary
`void` | `close()` Closes the stream.
`void` | `flush()` Flushes the stream.
`void` | `write(byte[] b)` Writes an array of bytes.
`void` | `write(byte[] b, int off, int len)` Writes a sub array of bytes.
`void` | `write(int b)` Writes a byte.
`void` | `writeObject(Object obj)` Write an object to the underlying storage or stream.

Methods inherited from interface java.io.DataOutput
`writeBoolean, writeByte, writeBytes, writeChar, writeChars, writeDouble, writeFloat, writeInt, writeLong, writeShort, writeUTF`

Method Detail

### writeObject

    void writeObject(Object obj)
                     throws IOException

  Write an object to the underlying storage or stream. The class that implements this interface defines how the object is written.

  Parameters:
    `obj` - the object to be written
  Throws:
    `IOException` - Any of the usual Input/Output related exceptions.

### write

    void write(int b)
               throws IOException

  Writes a byte. This method will block until the byte is actually written.

  Specified by:
    `write` in interface `DataOutput`
  Parameters:
    `b` - the byte
  Throws:
    `IOException` - If an I/O error has occurred.

### write

    void write(byte[] b)
               throws IOException

  Writes an array of bytes. This method will block until the bytes are actually written.

  Specified by:
    `write` in interface `DataOutput`
  Parameters:
    `b` - the data to be written
  Throws:
    `IOException` - If an I/O error has occurred.

### write

    void write(byte[] b,
               int off,
               int len)
               throws IOException

  Writes a sub array of bytes.

  Specified by:
    `write` in interface `DataOutput`
  Parameters:
    `b` - the data to be written
    `off` - the start offset in the data
    `len` - the number of bytes that are written
  Throws:
    `IOException` - If an I/O error has occurred.

### flush

    void flush()
               throws IOException

  Flushes the stream. This will write any buffered output bytes.

  Throws:
    `IOException` - If an I/O error has occurred.

### close

    void close()
               throws IOException

  Closes the stream. This method must be called to release any resources associated with the stream.

  Throws:
    `IOException` - If an I/O error has occurred.

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For further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

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