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网上订蛋糕怎么定,OutputStream (Java Platform SE 6)

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Overview Package   Class Use Tree Deprecated Index Help Java™ PlatformStandard Ed. 6 PREV CLASS  NEXT CLASSFRAMES  NO FRAMES  SUMMARY: NESTED | FIELD | CONSTR | METHODDETAIL: FIELD | CONSTR | METHODjava.ioClass OutputStreamjava.lang.Objectextended by java.io.OutputStreamAll Implemented Interfaces: Closeable, FlushableDirect Known Subclasses: ByteArrayOutputStream, FileOutputStream, FilterOutputStream, ObjectOutputStream, OutputStream, PipedOutputStreampublic abstract class OutputStreamextends Objectimplements 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:JDK1.0See Also:BufferedOutputStream, ByteArrayOutputStream, DataOutputStream, FilterOutputStream, InputStream, write(int)

Constructor SummaryOutputStream()            Method Summary voidclose()          Closes this output stream and releases any system resources associated with this stream. voidflush()          Flushes this output stream and forces any buffered output bytes to be written out. voidwrite(byte[] b)          Writes b.length bytes from the specified byte array to this output stream. voidwrite(byte[] b,int off,int len)          Writes len bytes from the specified byte array starting at offset off to this output stream.abstract  voidwrite(int b)          Writes the specified byte to this output stream. Methods inherited from class java.lang.Objectclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait 

Constructor DetailOutputStreampublic OutputStream()Method Detailwritepublic abstract void write(int b)throws IOExceptionWrites the specified byte to this output stream. The general contract for write is that one byte is written to the output stream. The byte to be written is the eight low-order bits of the argument b. The 24 high-order bits of b are ignored.

Subclasses of OutputStream must provide an implementation for this method.

Parameters:b - the byte.Throws:IOException - if an I/O error occurs. In particular, an IOException may be thrown if the output stream has been closed.writepublic void write(byte[] b) throws IOExceptionWrites b.length bytes from the specified byte array to this output stream. The general contract for write(b) is that it should have exactly the same effect as the call write(b, 0, b.length).

Parameters:b - the data.Throws:IOException - if an I/O error occurs.See Also:write(byte[], int, int)writepublic void write(byte[] b,int off,int len) throws IOExceptionWrites len bytes from the specified byte array starting at offset off to this output stream. The general contract for write(b, off, len) is that some of the bytes in the array b are written to the output stream in order; element b[off] is the first byte written and b[off+len-1] is the last byte written by this operation.

The write method of OutputStream 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 is null, a NullPointerException is thrown.

If off is negative, or len is negative, or off+len is greater than the length of the array b, 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, an IOException is thrown if the output stream is closed.flushpublic void flush() throws IOExceptionFlushes this output stream and forces any buffered output bytes to be written out. The general contract of flush 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 of OutputStream does nothing.

Specified by:flush in interface FlushableThrows:IOException - if an I/O error occurs.closepublic void close() throws IOExceptionCloses this output stream and releases any system resources associated with this stream. The general contract of close is that it closes the output stream. A closed stream cannot perform output operations and cannot be reopened.

The close method of OutputStream does nothing.

Specified by:close in interface CloseableThrows:IOException - if an I/O error occurs.Overview Package   Class Use Tree Deprecated Index Help Java™ PlatformStandard Ed. 6 PREV CLASS  NEXT CLASSFRAMES  NO FRAMES  SUMMARY: NESTED | FIELD | CONSTR | METHODDETAIL: FIELD | CONSTR | METHOD Submit a bug or featureFor further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

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