Creates a new character-stream reader whose critical sections will synchronize on the given object.

lock	The Object to synchronize on.

Closes the stream and releases any system resources associated with it. Once the stream has been closed, further read(), ready(), mark(), reset(), or skip() invocations will throw an IOException. Closing a previously closed stream has no effect.

Throws

IOException: If an I/O error occurs

Marks the present position in the stream. Subsequent calls to reset() will attempt to reposition the stream to this point. Not all character-input streams support the mark() operation.

readAheadLimit	Limit on the number of characters that may be read while still preserving the mark. After reading this many characters, attempting to reset the stream may fail.
Throws	IOException: If the stream does not support mark(), or if some other I/O error occurs

Tells whether this stream supports the mark() operation. The default implementation always returns false. Subclasses should override this method.

return

true if and only if this stream supports the mark operation.

Attempts to read characters into the specified character buffer. The buffer is used as a repository of characters as-is: the only changes made are the results of a put operation. No flipping or rewinding of the buffer is performed.

target	the buffer to read characters into
return	The number of characters added to the buffer, or -1 if this source of characters is at its end
Throws	IOException: if an I/O error occurs
Throws	NullPointerException: if target is null
Throws	ReadOnlyBufferException: if target is a read only buffer
since	1.5

Reads a single character. This method will block until a character is available, an I/O error occurs, or the end of the stream is reached.

Subclasses that intend to support efficient single-character input should override this method.

return	The character read, as an integer in the range 0 to 65535 (0x00-0xffff), or -1 if the end of the stream has been reached
Throws	IOException: If an I/O error occurs

Reads characters into an array. This method will block until some input is available, an I/O error occurs, or the end of the stream is reached.

cbuf	Destination buffer
return	The number of characters read, or -1 if the end of the stream has been reached
Throws	IOException: If an I/O error occurs

Reads characters into a portion of an array. This method will block until some input is available, an I/O error occurs, or the end of the stream is reached.

cbuf	Destination buffer
off	Offset at which to start storing characters
len	Maximum number of characters to read
return	The number of characters read, or -1 if the end of the stream has been reached
Throws	IOException: If an I/O error occurs

Tells whether this stream is ready to be read.

return	True if the next read() is guaranteed not to block for input, false otherwise. Note that returning false does not guarantee that the next read will block.
Throws	IOException: If an I/O error occurs

Resets the stream. If the stream has been marked, then attempt to reposition it at the mark. If the stream has not been marked, then attempt to reset it in some way appropriate to the particular stream, for example by repositioning it to its starting point. Not all character-input streams support the reset() operation, and some support reset() without supporting mark().

Throws

IOException: If the stream has not been marked, or if the mark has been invalidated, or if the stream does not support reset(), or if some other I/O error occurs

Skips characters. This method will block until some characters are available, an I/O error occurs, or the end of the stream is reached.

n	The number of characters to skip
return	The number of characters actually skipped
Throws	IllegalArgumentException: If n is negative.
Throws	IOException: If an I/O error occurs