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# Class java.io.DataOutputStream

    java.lang.Object
       |
       +----java.io.OutputStream
               |
               +----java.io.FilterOutputStream
                       |
                       +----java.io.DataOutputStream

public class DataOutputStream
extends FilterOutputStream
implements DataOutput

This class lets you write primitive Java data types to a stream in a portable way. Primitive data types are well understood types with associated operations. For example, an Integer is considered to be a good primitive data type. The data can be converted back using a DataInputStream.

##

written
  The number of bytes written so far.

##

DataOutputStream(OutputStream)
  Creates a new DataOutputStream.

##

flush()
  Flushes the stream.
size()
  Returns the number of bytes written.
write(byte[], int, int)
  Writes a sub array of bytes.
write(int)
  Writes a byte.
writeBoolean(boolean)
  Writes a boolean.
writeByte(int)
  Writes an 8 bit byte.
writeBytes(String)
  Writes a String as a sequence of bytes.
writeChar(int)
  Writes a 16 bit char.
writeChars(String)
  Writes a String as a sequence of chars.
writeDouble(double)
  Writes a 64 bit double.
writeFloat(float)
  Writes a 32 bit float.
writeInt(int)
  Writes a 32 bit int.
writeLong(long)
  Writes a 64 bit long.
writeShort(int)
  Writes a 16 bit short.
writeUTF(String)
  Writes a String in UTF format.

##

written

      protected int written

  The number of bytes written so far.

##

DataOutputStream

      public DataOutputStream(OutputStream out)

  Creates a new DataOutputStream.

  Parameters:
    out - the output stream

##

write

      public synchronized void write(int b) throws IOException

  Writes a byte. Will block until the byte is actually written.

  Parameters:
    b - the byte to be written
  Throws: IOException
    If an I/O error has occurred.
  Overrides:
    write in class FilterOutputStream

write

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

  Writes a sub array of bytes.

  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.
  Overrides:
    write in class FilterOutputStream

flush

      public void flush() throws IOException

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

  Throws: IOException
    If an I/O error has occurred.
  Overrides:
    flush in class FilterOutputStream

writeBoolean

      public final void writeBoolean(boolean v) throws IOException

  Writes a boolean.

  Parameters:
    v - the boolean to be written

writeByte

      public final void writeByte(int v) throws IOException

  Writes an 8 bit byte.

  Parameters:
    v - the byte value to be written

writeShort

      public final void writeShort(int v) throws IOException

  Writes a 16 bit short.

  Parameters:
    v - the short value to be written

writeChar

      public final void writeChar(int v) throws IOException

  Writes a 16 bit char.

  Parameters:
    v - the char value to be written

writeInt

      public final void writeInt(int v) throws IOException

  Writes a 32 bit int.

  Parameters:
    v - the integer value to be written

writeLong

      public final void writeLong(long v) throws IOException

  Writes a 64 bit long.

  Parameters:
    v - the long value to be written

writeFloat

      public final void writeFloat(float v) throws IOException

  Writes a 32 bit float.

  Parameters:
    v - the float value to be written

writeDouble

      public final void writeDouble(double v) throws IOException

  Writes a 64 bit double.

  Parameters:
    v - the double value to be written

writeBytes

      public final void writeBytes(String s) throws IOException

  Writes a String as a sequence of bytes.

  Parameters:
    s - the String of bytes to be written

writeChars

      public final void writeChars(String s) throws IOException

  Writes a String as a sequence of chars.

  Parameters:
    s - the String of chars to be written

writeUTF

      public final void writeUTF(String str) throws IOException

  Writes a String in UTF format.

  Parameters:
    str - the String in UTF format

size

      public final int size()

  Returns the number of bytes written.

  Returns:
    the number of bytes written thus far.

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