- * Applications that need to define a subclass of
- * OutputStream must always provide at least a method
- * that writes one byte of output.
- *
- * @author Arthur van Hoff
- * @see java.io.BufferedOutputStream
- * @see java.io.ByteArrayOutputStream
- * @see java.io.DataOutputStream
- * @see java.io.FilterOutputStream
- * @see java.io.InputStream
- * @see java.io.OutputStream#write(int)
- * @since JDK1.0
- */
-public abstract class OutputStream implements Closeable, Flushable {
- /**
- * 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.
- *
- * @param b the byte.
- * @exception IOException if an I/O error occurs. In particular,
- * an IOException may be thrown if the
- * output stream has been closed.
- */
- public abstract void write(int 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).
- *
- * @param b the data.
- * @exception IOException if an I/O error occurs.
- * @see java.io.OutputStream#write(byte[], int, int)
- */
- public void write(byte b[]) throws IOException {
- write(b, 0, b.length);
- }
-
- /**
- * 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.
- *
- * @param b the data.
- * @param off the start offset in the data.
- * @param len the number of bytes to write.
- * @exception IOException if an I/O error occurs. In particular,
- * an IOException is thrown if the output
- * stream is closed.
- */
- public void write(byte b[], int off, int len) throws IOException {
- if (b == null) {
- throw new NullPointerException();
- } else if ((off < 0) || (off > b.length) || (len < 0) ||
- ((off + len) > b.length) || ((off + len) < 0)) {
- throw new IndexOutOfBoundsException();
- } else if (len == 0) {
- return;
- }
- for (int i = 0 ; i < len ; i++) {
- write(b[off + i]);
- }
- }
-
- /**
- * 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.
- *
- * @exception IOException if an I/O error occurs.
- */
- public void flush() 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.
- *
- * @exception IOException if an I/O error occurs.
- */
- public void close() throws IOException {
- }
-
-}