java.io

Class OutputStream

public abstract class OutputStream extends Object implements Closeable, Flushable

This abstract class forms the base of the hierarchy of classes that write output as a stream of bytes. It provides a common set of methods for writing bytes to stream. Subclasses implement and/or extend these methods to write bytes in a particular manner or to a particular destination such as a file on disk or network connection.

Constructor Summary
	OutputStream() This is the default no-argument constructor for this class.

Method Summary
void	close() This method closes the stream.
void	flush() This method forces any data that may have been buffered to be written to the underlying output device.
abstract void	write(int b) This method writes a single byte to the output stream.
void	write(byte[] b) This method all the writes bytes from the passed array to the output stream.
void	write(byte[] b, int off, int len) This method writes `len` bytes from the specified array `b` starting at index `off` into the array.

Constructor Detail

OutputStream

public OutputStream()

This is the default no-argument constructor for this class. This method does nothing in this class.

Method Detail

close

public void close()

This method closes the stream. Any internal or native resources associated with this stream are freed. Any subsequent attempt to access the stream might throw an exception.

This method in this class does nothing.

Throws: IOException If an error occurs

flush

public void flush()

This method forces any data that may have been buffered to be written to the underlying output device. Please note that the host environment might perform its own buffering unbeknowst to Java. In that case, a write made (for example, to a disk drive) might be cached in OS buffers instead of actually being written to disk.

This method in this class does nothing.

Throws: IOException If an error occurs

write

public abstract void write(int b)

This method writes a single byte to the output stream. The byte written is the low eight bits of the int passed and a argument.

Subclasses must provide an implementation of this abstract method

Parameters: b The byte to be written to the output stream, passed as the low eight bits of an int

Throws: IOException If an error occurs

write

public void write(byte[] b)

This method all the writes bytes from the passed array to the output stream. This method is equivalent to

write(b, 0,
 buf.length)

which is exactly how it is implemented in this class.

Parameters: b The array of bytes to write

Throws: IOException If an error occurs

write

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

This method writes len bytes from the specified array b starting at index off into the array.

This method in this class calls the single byte write() method in a loop until all bytes have been written. Subclasses should override this method if possible in order to provide a more efficent implementation.

Parameters: b The array of bytes to write from off The index into the array to start writing from len The number of bytes to write

Throws: IOException If an error occurs