java.io
Class DataOutputStream

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

public class DataOutputStream
extends OutputStream

Transmits java data types as bytes over an OutputStream.

Field Summary

protected OutputStream	out
protected int	written

Constructor Summary

DataOutputStream(OutputStream out)

Method Summary

void	close() Closes this data output stream.
void	flush() Flushes this data output stream.
int	size() Returns the current value of the counter written, the number of bytes written to this data output stream so far.
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	writeBytes(String s)
void	writeChar(int v) Writes a char to the underlying output stream as a 2-byte value, high byte first.
void	writeChars(String s)
void	writeDouble(double v) Converts the double argument to a long using the doubleToLongBits method in class Double, and then writes that long value to the underlying output stream as an 8-byte quantity, high byte first.
void	writeFloat(float v) Converts the float argument to an int using the floatToIntBits method in class Float, and then writes that int value to the underlying output stream as a 4-byte quantity, high byte first.
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.

Methods inherited from class java.io.OutputStream

write

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

written

protected int written

out

protected OutputStream out

Constructor Detail

DataOutputStream

public DataOutputStream(OutputStream out)

Method Detail

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 DataOuputStream calls the flush method of its underlying output stream.

Overrides:

flush in class OutputStream

Throws:

IOException - if an I/O error occurs.

See Also:

java.io.FilterOutputStream#out, OutputStream.flush()

size

public final int size()

Returns the current value of the counter written, the number of bytes written to this data output stream so far. If the counter overflows, it will be wrapped to Integer.MAX_VALUE.

Returns:

the value of the written field.

See Also:

written

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. If no exception is thrown, the counter written is incremented by len.

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.

See Also:

java.io.FilterOutputStream#out

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. If no exception is thrown, the counter written is incremented by 1.

Implements the write method of OutputStream.

Specified by:

write in class OutputStream

Parameters:

b - the byte to be written.

Throws:

IOException - if an I/O error occurs.

See Also:

java.io.FilterOutputStream#out

close

public void close()
           throws IOException

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

The close method of DataOuputStream calls the close method of its underlying output stream.

Overrides:

close in class OutputStream

Throws:

IOException - if an I/O error occurs.

See Also:

java.io.FilterOutputStream#out, OutputStream.flush()

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. If no exception is thrown, the counter written is incremented by 1.

Parameters:

v - a boolean value to be written.

Throws:

IOException - if an I/O error occurs.

See Also:

java.io.FilterOutputStream#out

writeByte

public final void writeByte(int v)
                     throws IOException

Writes out a byte to the underlying output stream as a 1-byte value. If no exception is thrown, the counter written is incremented by 1.

Parameters:

v - a byte value to be written.

Throws:

IOException - if an I/O error occurs.

See Also:

java.io.FilterOutputStream#out

writeBytes

public final void writeBytes(String s)
                      throws IOException

Throws:

IOException

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. If no exception is thrown, the counter written is incremented by 2.

Parameters:

v - a char value to be written.

Throws:

IOException - if an I/O error occurs.

See Also:

java.io.FilterOutputStream#out

writeChars

public final void writeChars(String s)
                      throws IOException

Throws:

IOException

writeDouble

public final void writeDouble(double v)
                       throws IOException

Converts the double argument to a long using the doubleToLongBits method in class Double, and then writes that long value to the underlying output stream as an 8-byte quantity, high byte first. If no exception is thrown, the counter written is incremented by 8.

Parameters:

v - a double value to be written.

Throws:

IOException - if an I/O error occurs.

See Also:

java.io.FilterOutputStream#out, Double.doubleToLongBits(double)

writeFloat

public final void writeFloat(float v)
                      throws IOException

Converts the float argument to an int using the floatToIntBits method in class Float, and then writes that int value to the underlying output stream as a 4-byte quantity, high byte first. If no exception is thrown, the counter written is incremented by 4.

Parameters:

v - a float value to be written.

Throws:

IOException - if an I/O error occurs.

See Also:

java.io.FilterOutputStream#out, Float.floatToIntBits(float)

writeInt

public final void writeInt(int v)
                    throws IOException

Writes an int to the underlying output stream as four bytes, high byte first. If no exception is thrown, the counter written is incremented by 4.

Parameters:

v - an int to be written.

Throws:

IOException - if an I/O error occurs.

See Also:

java.io.FilterOutputStream#out

writeLong

public final void writeLong(long v)
                     throws IOException

Writes a long to the underlying output stream as eight bytes, high byte first. In no exception is thrown, the counter written is incremented by 8.

Parameters:

v - a long to be written.

Throws:

IOException - if an I/O error occurs.

See Also:

java.io.FilterOutputStream#out

writeShort

public final void writeShort(int v)
                      throws IOException

Writes a short to the underlying output stream as two bytes, high byte first. If no exception is thrown, the counter written is incremented by 2.

Parameters:

v - a short to be written.

Throws:

IOException - if an I/O error occurs.

See Also:

java.io.FilterOutputStream#out