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public class

DataOutputStream

extends FilterOutputStream
implements DataOutput
java.lang.Object
   ↳ java.io.OutputStream
     ↳ java.io.FilterOutputStream
       ↳ java.io.DataOutputStream

Class Overview

DataOutputStream is a filter class which can write typed data to a Stream. Typically, this stream can be read in by a DataInputStream. Types that can be written include byte, 16-bit short, 32-bit int, 32-bit float, 64-bit long, 64-bit double, byte strings, and UTF Strings.

See Also

Summary

Fields
protected int written The number of bytes written out so far
[Expand]
Inherited Fields
From class java.io.FilterOutputStream
Public Constructors
DataOutputStream(OutputStream out)
Constructs a new DataOutputStream on the OutputStream out.
Public Methods
void flush()
Flush this DataOutputStream to ensure all pending data is sent out to the target OutputStream.
final int size()
Returns the total number of bytes written to this stream thus far.
void write(int oneByte)
Writes the specified byte to the OutputStream.
void write(byte[] buffer, int offset, int count)
Writes count bytes from the byte array buffer starting at offset index to the OutputStream.
final void writeBoolean(boolean val)
Writes a boolean to this output stream.
final void writeByte(int val)
Writes a 8-bit byte to this output stream.
final void writeBytes(String str)
Writes the low order 8-bit bytes from a String to this output stream.
final void writeChar(int val)
Writes the specified 16-bit character to the OutputStream.
final void writeChars(String str)
Writes the specified 16-bit characters contained in str to the OutputStream.
final void writeDouble(double val)
Writes a 64-bit double to this output stream.
final void writeFloat(float val)
Writes a 32-bit float to this output stream.
final void writeInt(int val)
Writes a 32-bit int to this output stream.
final void writeLong(long val)
Writes a 64-bit long to this output stream.
final void writeShort(int val)
Writes the specified 16-bit short to the OutputStream.
final void writeUTF(String str)
Writes the specified String out in UTF format.
[Expand]
Inherited Methods
From class java.io.FilterOutputStream
From class java.io.OutputStream
From class java.lang.Object
From interface java.io.Closeable
From interface java.io.DataOutput
From interface java.io.Flushable

Fields

protected int written

The number of bytes written out so far

Public Constructors

public DataOutputStream (OutputStream out)

Constructs a new DataOutputStream on the OutputStream out. All writes can now be filtered through this stream. Note that data written by this Stream is not in a human readable format but can be reconstructed by using a DataInputStream on the resulting output.

Parameters
out the target OutputStream to filter writes on.

Public Methods

public void flush ()

Flush this DataOutputStream to ensure all pending data is sent out to the target OutputStream. This implementation flushes the target OutputStream.

Throws
IOException If an error occurs attempting to flush this DataOutputStream.

public final int size ()

Returns the total number of bytes written to this stream thus far.

Returns
  • the number of bytes written to this DataOutputStream.

public void write (int oneByte)

Writes the specified byte to the OutputStream.

Parameters
oneByte the byte to be written
Throws
IOException If an error occurs attempting to write to this DataOutputStream.
See Also

public void write (byte[] buffer, int offset, int count)

Writes count bytes from the byte array buffer starting at offset index to the OutputStream.

Parameters
buffer the buffer to be written
offset offset in buffer to get bytes
count number of bytes in buffer to write
Throws
IOException If an error occurs attempting to write to this DataOutputStream.
See Also

public final void writeBoolean (boolean val)

Writes a boolean to this output stream.

Parameters
val the boolean value to write to the OutputStream
Throws
IOException If an error occurs attempting to write to this DataOutputStream.
See Also

public final void writeByte (int val)

Writes a 8-bit byte to this output stream.

Parameters
val the byte value to write to the OutputStream
Throws
IOException If an error occurs attempting to write to this DataOutputStream.
See Also

public final void writeBytes (String str)

Writes the low order 8-bit bytes from a String to this output stream.

Parameters
str the String containing the bytes to write to the OutputStream
Throws
IOException If an error occurs attempting to write to this DataOutputStream.
See Also

public final void writeChar (int val)

Writes the specified 16-bit character to the OutputStream. Only the lower 2 bytes are written with the higher of the 2 bytes written first. This represents the Unicode value of val.

Parameters
val the character to be written
Throws
IOException If an error occurs attempting to write to this DataOutputStream.
See Also

public final void writeChars (String str)

Writes the specified 16-bit characters contained in str to the OutputStream. Only the lower 2 bytes of each character are written with the higher of the 2 bytes written first. This represents the Unicode value of each character in str.

Parameters
str the String whose characters are to be written.
Throws
IOException If an error occurs attempting to write to this DataOutputStream.
See Also

public final void writeDouble (double val)

Writes a 64-bit double to this output stream. The resulting output is the 8 bytes resulting from calling Double.doubleToLongBits().

Parameters
val the double to be written.
Throws
IOException If an error occurs attempting to write to this DataOutputStream.
See Also

public final void writeFloat (float val)

Writes a 32-bit float to this output stream. The resulting output is the 4 bytes resulting from calling Float.floatToIntBits().

Parameters
val the float to be written.
Throws
IOException If an error occurs attempting to write to this DataOutputStream.
See Also

public final void writeInt (int val)

Writes a 32-bit int to this output stream. The resulting output is the 4 bytes, highest order first, of val.

Parameters
val the int to be written.
Throws
IOException If an error occurs attempting to write to this DataOutputStream.
See Also

public final void writeLong (long val)

Writes a 64-bit long to this output stream. The resulting output is the 8 bytes, highest order first, of val.

Parameters
val the long to be written.
Throws
IOException If an error occurs attempting to write to this DataOutputStream.
See Also

public final void writeShort (int val)

Writes the specified 16-bit short to the OutputStream. Only the lower 2 bytes are written with the higher of the 2 bytes written first.

Parameters
val the short to be written
Throws
IOException If an error occurs attempting to write to this DataOutputStream.
See Also

public final void writeUTF (String str)

Writes the specified String out in UTF format.

Parameters
str the String to be written in UTF format.
Throws
IOException If an error occurs attempting to write to this DataOutputStream.
See Also