- java.lang.Object
-
- java.io.OutputStream
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- All Implemented Interfaces:
- Closeable, Flushable, AutoCloseable
- Direct Known Subclasses:
- ByteArrayOutputStream, FileOutputStream, FilterOutputStream, ObjectOutputStream, OutputStream, PipedOutputStream
public abstract class OutputStream extends Object implements Closeable, Flushable
This abstract class is the superclass of all classes representing an output stream of bytes. An output stream accepts output bytes and sends them to some sink.Applications that need to define a subclass of
OutputStream
must always provide at least a method that writes one byte of output.- Since:
- JDK1.0
- See Also:
BufferedOutputStream
,ByteArrayOutputStream
,DataOutputStream
,FilterOutputStream
,InputStream
,write(int)
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-
Constructor Summary
Constructors Constructor and Description OutputStream()
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Method Summary
Methods Modifier and Type Method and Description void
close()
Closes this output stream and releases any system resources associated with this stream.void
flush()
Flushes this output stream and forces any buffered output bytes to be written out.void
write(byte[] b)
Writesb.length
bytes from the specified byte array to this output stream.void
write(byte[] b, int off, int len)
Writeslen
bytes from the specified byte array starting at offsetoff
to this output stream.abstract void
write(int b)
Writes the specified byte to this output stream.
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-
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Method Detail
-
write
public abstract void write(int b) throws IOException
Writes the specified byte to this output stream. The general contract forwrite
is that one byte is written to the output stream. The byte to be written is the eight low-order bits of the argumentb
. The 24 high-order bits ofb
are ignored.Subclasses of
OutputStream
must provide an implementation for this method.- Parameters:
b
- thebyte
.- Throws:
IOException
- if an I/O error occurs. In particular, anIOException
may be thrown if the output stream has been closed.
-
write
public void write(byte[] b) throws IOException
Writesb.length
bytes from the specified byte array to this output stream. The general contract forwrite(b)
is that it should have exactly the same effect as the callwrite(b, 0, b.length)
.- Parameters:
b
- the data.- Throws:
IOException
- if an I/O error occurs.- See Also:
write(byte[], int, int)
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write
public void write(byte[] b, int off, int len) throws IOException
Writeslen
bytes from the specified byte array starting at offsetoff
to this output stream. The general contract forwrite(b, off, len)
is that some of the bytes in the arrayb
are written to the output stream in order; elementb[off]
is the first byte written andb[off+len-1]
is the last byte written by this operation.The
write
method ofOutputStream
calls the write method of one argument on each of the bytes to be written out. Subclasses are encouraged to override this method and provide a more efficient implementation.If
b
isnull
, aNullPointerException
is thrown.If
off
is negative, orlen
is negative, oroff+len
is greater than the length of the arrayb
, then an IndexOutOfBoundsException is thrown.- 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. In particular, anIOException
is thrown if the output stream is closed.
-
flush
public void flush() throws IOException
Flushes this output stream and forces any buffered output bytes to be written out. The general contract offlush
is that calling it is an indication that, if any bytes previously written have been buffered by the implementation of the output stream, such bytes should immediately be written to their intended destination.If the intended destination of this stream is an abstraction provided by the underlying operating system, for example a file, then flushing the stream guarantees only that bytes previously written to the stream are passed to the operating system for writing; it does not guarantee that they are actually written to a physical device such as a disk drive.
The
flush
method ofOutputStream
does nothing.- Specified by:
flush
in interfaceFlushable
- 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 this stream. The general contract ofclose
is that it closes the output stream. A closed stream cannot perform output operations and cannot be reopened.The
close
method ofOutputStream
does nothing.- Specified by:
close
in interfaceCloseable
- Specified by:
close
in interfaceAutoCloseable
- Throws:
IOException
- if an I/O error occurs.
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