OutputStream (Java Platform SE 8 )

2023-10-15 03:21| 来源: 网络整理| 查看: 265

Skip navigation links Overview Package Class Use Tree Deprecated Index Help Java™ PlatformStandard Ed. 8 Prev Class Next Class Frames No Frames All Classes Summary: Nested | Field | Constr | Method Detail: Field | Constr | Method compact1, compact2, compact3 java.io Class OutputStream java.lang.Object java.io.OutputStream 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) Constructor Summary Constructors Constructor and Description OutputStream() Method Summary All Methods Instance Methods Abstract Methods Concrete 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) Writes b.length bytes from the specified byte array to this output stream. void write(byte[] b, int off, int len) Writes len bytes from the specified byte array starting at offset off to this output stream. abstract void write(int b) Writes the specified byte to this output stream. Methods inherited from class java.lang.Object clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait Constructor Detail OutputStream public OutputStream() Method Detail write public abstract void write(int b) throws IOException Writes 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. write public void write(byte[] b) throws IOException Writes 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) 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 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. flush public void flush() throws IOException Flushes 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 Flushable 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 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 Closeable Specified by: close in interface AutoCloseable Throws: IOException - if an I/O error occurs. Skip navigation links Overview Package Class Use Tree Deprecated Index Help Java™ PlatformStandard Ed. 8 Prev Class Next Class Frames No Frames All Classes Summary: Nested | Field | Constr | Method Detail: Field | Constr | Method

Submit a bug or feature For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples. Copyright © 1993, 2023, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.

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