DataOutputStream (Java Card API, Connected Edition)
Date: 2009-12-11

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## java.io
Class DataOutputStream

    java.lang.Object
      java.io.OutputStream
          java.io.DataOutputStream

All Implemented Interfaces:
  DataOutput

    @TransactionType(value=NOT_SUPPORTED)
    public class DataOutputStream

extends OutputStream
implements DataOutput

A data output stream lets an application write primitive Java data types to an output stream in a portable way. An application can then use a data input stream to read the data back in.

Since:
  JDK1.0, CLDC 1.0, Java Card 3.0
See Also:
  `DataInputStream`

Field Summary
`protected OutputStream` | `out` The output stream.

Constructor Summary
`DataOutputStream(OutputStream out)` Creates a new data output stream to write data to the specified underlying output stream.

Method Summary
`void` | `close()` Closes this output stream and releases any system resources associated with the stream.
`void` | `flush()` Flushes this data output stream.
`void` | `write(byte[] b, int off, int len)` Writes `len` bytes from the specified byte array starting at offset `off` to the underlying output stream.
`void` | `write(int b)` Writes the specified byte (the low eight bits of the argument `b`) to the underlying output stream.
`void` | `writeBoolean(boolean v)` Writes a `boolean` to the underlying output stream as a 1-byte value.
`void` | `writeByte(int v)` Writes out a `byte` to the underlying output stream as a 1-byte value.
`void` | `writeChar(int v)` Writes a `char` to the underlying output stream as a 2-byte value, high byte first.
`void` | `writeChars(String s)` Writes a string to the underlying output stream as a sequence of characters.
`void` | `writeInt(int v)` Writes an `int` to the underlying output stream as four bytes, high byte first.
`void` | `writeLong(long v)` Writes a `long` to the underlying output stream as eight bytes, high byte first.
`void` | `writeShort(int v)` Writes a `short` to the underlying output stream as two bytes, high byte first.
`void` | `writeUTF(String str)` Writes a string to the underlying output stream using UTF-8 encoding in a machine-independent manner.

Methods inherited from class java.io.OutputStream
`write`

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Methods inherited from interface java.io.DataOutput
`write`

Field Detail

### out

    protected OutputStream out

  The output stream.

Constructor Detail

### DataOutputStream

    public DataOutputStream(OutputStream out)

  Creates a new data output stream to write data to the specified underlying output stream.

  Parameters:
    `out` - the underlying output stream, to be saved for later use.

Method Detail

### write

    public void write(int b)
               throws IOException

  Writes the specified byte (the low eight bits of the argument `b`) to the underlying output stream.

  Implements the `write` method of `OutputStream`.

  Specified by:
    `write` in interface `DataOutput`
  Specified by:
    `write` in class `OutputStream`
  Parameters:
    `b` - the `byte` to be written.
  Throws:
    `IOException` - if an I/O error occurs.

### write

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

  Writes `len` bytes from the specified byte array starting at offset `off` to the underlying output stream.

  Specified by:
    `write` in interface `DataOutput`
  Overrides:
    `write` in class `OutputStream`
  Parameters:
    `b` - the data.
    `off` - the start offset in the data.
    `len` - the number of bytes to write.
  Throws:
    `IOException` - if an I/O error occurs.

### flush

    public void flush()
               throws IOException

  Flushes this data output stream. This forces any buffered output bytes to be written out to the stream.

  The `flush` method of `DataOutputStream` calls the `flush` method of its underlying output stream.

  Overrides:
    `flush` in class `OutputStream`
  Throws:
    `IOException` - if an I/O error occurs.

### close

    public void close()
               throws IOException

  Closes this output stream and releases any system resources associated with the stream.

  The `close` method calls its `flush` method, and then calls the `close` method of its underlying output stream.

  Overrides:
    `close` in class `OutputStream`
  Throws:
    `IOException` - if an I/O error occurs.

### writeBoolean

    public final void writeBoolean(boolean v)
                            throws IOException

  Writes a `boolean` to the underlying output stream as a 1-byte value. The value `true` is written out as the value `(byte)1`; the value `false` is written out as the value `(byte)0`.

  Specified by:
    `writeBoolean` in interface `DataOutput`
  Parameters:
    `v` - a `boolean` value to be written.
  Throws:
    `IOException` - if an I/O error occurs.

### writeByte

    public final void writeByte(int v)
                         throws IOException

  Writes out a `byte` to the underlying output stream as a 1-byte value.

  Specified by:
    `writeByte` in interface `DataOutput`
  Parameters:
    `v` - a `byte` value to be written.
  Throws:
    `IOException` - if an I/O error occurs.

### writeShort

    public final void writeShort(int v)
                          throws IOException

  Writes a `short` to the underlying output stream as two bytes, high byte first.

  Specified by:
    `writeShort` in interface `DataOutput`
  Parameters:
    `v` - a `short` to be written.
  Throws:
    `IOException` - if an I/O error occurs.

### writeChar

    public final void writeChar(int v)
                         throws IOException

  Writes a `char` to the underlying output stream as a 2-byte value, high byte first.

  Specified by:
    `writeChar` in interface `DataOutput`
  Parameters:
    `v` - a `char` value to be written.
  Throws:
    `IOException` - if an I/O error occurs.

### writeInt

    public final void writeInt(int v)
                        throws IOException

  Writes an `int` to the underlying output stream as four bytes, high byte first.

  Specified by:
    `writeInt` in interface `DataOutput`
  Parameters:
    `v` - an `int` to be written.
  Throws:
    `IOException` - if an I/O error occurs.

### writeLong

    public final void writeLong(long v)
                         throws IOException

  Writes a `long` to the underlying output stream as eight bytes, high byte first.

  Specified by:
    `writeLong` in interface `DataOutput`
  Parameters:
    `v` - a `long` to be written.
  Throws:
    `IOException` - if an I/O error occurs.

### writeChars

    public final void writeChars(String s)
                          throws IOException

  Writes a string to the underlying output stream as a sequence of characters. Each character is written to the data output stream as if by the `writeChar` method.

  Specified by:
    `writeChars` in interface `DataOutput`
  Parameters:
    `s` - a `String` value to be written.
  Throws:
    `IOException` - if an I/O error occurs.
  See Also:
    `writeChar(int)`

### writeUTF

    public final void writeUTF(String str)
                        throws IOException

  Writes a string to the underlying output stream using UTF-8 encoding in a machine-independent manner.

  First, two bytes are written to the output stream as if by the `writeShort` method giving the number of bytes to follow. This value is the number of bytes actually written out, not the length of the string. Following the length, each character of the string is output, in sequence, using the UTF-8 encoding for the character.

  Specified by:
    `writeUTF` in interface `DataOutput`
  Parameters:
    `str` - a string to be written.
  Throws:
    `IOException` - if an I/O error occurs.

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Copyright (c) 2009 Sun Microsystems, Inc. All rights reserved.