Closeable, Flushable, Appendable, AutoCloseable
Writes text to a character-output stream, buffering characters so as to provide for the efficient writing of single characters, arrays, and strings.
The buffer size may be specified, or the default size may be accepted. The default is large enough for most purposes.
A newLine() method is provided, which uses the platform's own notion of line separator as defined by the system property line.separator. Not all platforms use the newline character ('\n') to terminate lines. Calling this method to terminate each output line is therefore preferred to writing a newline character directly.
In general, a Writer sends its output immediately to the underlying character or byte stream. Unless prompt output is required, it is advisable to wrap a BufferedWriter around any Writer whose write() operations may be costly, such as FileWriters and OutputStreamWriters. For example,
PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter("foo.out")));
will buffer the PrintWriter's output to the file. Without buffering, each invocation of a print() method would cause characters to be converted into bytes that would then be written immediately to the file, which can be very inefficient.
Constructors
Creates a buffered character-output stream that uses a default-sized output buffer.
Creates a new buffered character-output stream that uses an output buffer of the given size.
void
Closes the stream, flushing it first.
void
void
void
write(char[] cbuf, int off, int len)
Writes a portion of an array of characters.
void
Writes a single character.
void
Writes a portion of a String.
Methods declared in class java.lang.Objectclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitCreates a buffered character-output stream that uses a default-sized output buffer.
out - A Writer
Creates a new buffered character-output stream that uses an output buffer of the given size.
out - A Writer
sz - Output-buffer size, a positive integer
IllegalArgumentException - If sz <= 0
Writes a single character.
write in class Writer
c - int specifying a character to be written
IOException - If an I/O error occurs
throws
IOExceptionOrdinarily this method stores characters from the given array into this stream's buffer, flushing the buffer to the underlying stream as needed. If the requested length is at least as large as the buffer, however, then this method will flush the buffer and write the characters directly to the underlying stream. Thus redundant BufferedWriters will not copy data unnecessarily.
write in class Writer
cbuf - A character array
off - Offset from which to start reading characters
len - Number of characters to write
IndexOutOfBoundsException - If off is negative, or len is negative, or off + len is negative or greater than the length of the given array
IOException - If an I/O error occurs
Writes a portion of a String.
write in class Writer
IndexOutOfBoundsException be thrown if len is negative or off + len is negative, the implementation in this class does not throw such an exception in these cases but instead simply writes no characters.
s - String to be written
off - Offset from which to start reading characters
len - Number of characters to be written
IndexOutOfBoundsException - If off is negative, or off + len is greater than the length of the given string
IOException - If an I/O error occurs
Writes a line separator. The line separator string is defined by the system property line.separator, and is not necessarily a single newline ('\n') character.
IOException - If an I/O error occurs
Flushes the stream.
flush in interface Flushable
flush in class Writer
IOException - If an I/O error occurs
Writer
Closes the stream, flushing it first. Once the stream has been closed, further write() or flush() invocations will cause an IOException to be thrown. Closing a previously closed stream has no effect.
close in interface AutoCloseable
close in interface Closeable
close in class Writer
IOException - If an I/O error occurs
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