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8182684: Further clarify InputStream#available()

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Reviewed-by: alanb, rriggs
This commit is contained in:
Brian Burkhalter 2018-03-13 12:24:39 -07:00
parent ae966db198
commit 516fa74ca5
1 changed files with 15 additions and 15 deletions
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30
src/java.base/share/classes/java/io/InputStream.java
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@ -539,29 +539,29 @@ public abstract class InputStream implements Closeable {
}
/**
* Returns an estimate of the number of bytes that can be read (or
* skipped over) from this input stream without blocking by the next
* invocation of a method for this input stream. The next invocation
* might be the same thread or another thread. A single read or skip of this
* many bytes will not block, but may read or skip fewer bytes.
* Returns an estimate of the number of bytes that can be read (or skipped
* over) from this input stream without blocking, which may be 0, or 0 when
* end of stream is detected. The read might be on the same thread or
* another thread. A single read or skip of this many bytes will not block,
* but may read or skip fewer bytes.
*
* <p> Note that while some implementations of {@code InputStream} will return
* the total number of bytes in the stream, many will not. It is
* <p> Note that while some implementations of {@code InputStream} will
* return the total number of bytes in the stream, many will not. It is
* never correct to use the return value of this method to allocate
* a buffer intended to hold all data in this stream.
*
* <p> A subclass' implementation of this method may choose to throw an
* {@link IOException} if this input stream has been closed by
* invoking the {@link #close()} method.
* <p> A subclass's implementation of this method may choose to throw an
* {@link IOException} if this input stream has been closed by invoking the
* {@link #close()} method.
*
* <p> The {@code available} method for class {@code InputStream} always
* returns {@code 0}.
* <p> The {@code available} method of {@code InputStream} always returns
* {@code 0}.
*
* <p> This method should be overridden by subclasses.
*
* @return an estimate of the number of bytes that can be read (or skipped
* over) from this input stream without blocking or {@code 0} when
* it reaches the end of the input stream.
* @return an estimate of the number of bytes that can be read (or
* skipped over) from this input stream without blocking or
* {@code 0} when it reaches the end of the input stream.
* @exception IOException if an I/O error occurs.
*/
public int available() throws IOException {