1. Description
2. Method Summary
3. Method Details
   1. writeObject(Object)
   2. write(int)
   3. write(byte[])
   4. write(byte[], int, int)
   5. flush()
   6. close()

All Superinterfaces:

AutoCloseable, DataOutput

All Known Implementing Classes:

ObjectOutputStream

• Method Summary

  All MethodsInstance MethodsAbstract Methods

  Modifier and Type

  Method

  Description

  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 declared in interface java.io.DataOutput

  writeBoolean, writeByte, writeBytes, writeChar, writeChars, writeDouble, writeFloat, writeInt, writeLong, writeShort, writeUTF

• Method Details

  • 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.

    IndexOutOfBoundsException - If off is negative, len is negative, or len is greater than b.length - off

  • 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.

    Specified by:

    close in interface AutoCloseable

    Throws:

    IOException - If an I/O error has occurred.

Report a bug or suggest an enhancement
For further API reference and developer documentation see the Java SE Documentation, which contains more detailed, developer-targeted descriptions with conceptual overviews, definitions of terms, workarounds, and working code examples. Other versions.
Java is a trademark or registered trademark of Oracle and/or its affiliates in the US and other countries.
Copyright © 1993, 2025, Oracle and/or its affiliates, 500 Oracle Parkway, Redwood Shores, CA 94065 USA.
All rights reserved. Use is subject to license terms and the documentation redistribution policy.