| java.lang.Object
 java.io.Writer
java.io.BufferedWriter
| BufferedWriter | | public class BufferedWriter extends Writer (Code) | | 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.
See Also: PrintWriter
See Also: FileWriter
See Also: OutputStreamWriter
version:
1.35, 07/05/05
author:
Mark Reinhold
since:
JDK1.1 |
| Constructor Summary | |
| public | BufferedWriter(Writer out)
Creates a buffered character-output stream that uses a default-sized
output buffer. | | public | BufferedWriter(Writer out, int sz)
Creates a new buffered character-output stream that uses an output
buffer of the given size. |
| Method Summary | |
| public void | close()
| | public void | flush()
Flushes the stream. | | void | flushBuffer()
Flushes the output buffer to the underlying character stream, without
flushing the stream itself. | | public void | newLine()
Writes a line separator. | | public void | write(int c)
Writes a single character. | | public void | write(char cbuf, int off, int len)
Writes a portion of an array of characters.
Ordinarily this method stores characters from the given array into
this stream's buffer, flushing the buffer to the underlying stream as
needed. | | public void | write(String s, int off, int len)
Writes a portion of a String.
If the value of the len parameter is negative then no
characters are written. |
| BufferedWriter | | public BufferedWriter(Writer out)(Code) | | Creates a buffered character-output stream that uses a default-sized
output buffer.
Parameters:
out - A Writer |
| BufferedWriter | | public BufferedWriter(Writer out, int sz)(Code) | | Creates a new buffered character-output stream that uses an output
buffer of the given size.
Parameters:
out - A Writer
Parameters:
sz - Output-buffer size, a positive integer
exception:
IllegalArgumentException - If sz is <= 0 |
| flushBuffer | | void flushBuffer() throws IOException(Code) | | Flushes the output buffer to the underlying character stream, without
flushing the stream itself. This method is non-private only so that it
may be invoked by PrintStream.
|
| newLine | | public void newLine() throws IOException(Code) | | 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.
exception:
IOException - If an I/O error occurs |
| write | | public void write(char cbuf, int off, int len) throws IOException(Code) | | Writes a portion of an array of characters.
Ordinarily 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.
Parameters:
cbuf - A character array
Parameters:
off - Offset from which to start reading characters
Parameters:
len - Number of characters to write
exception:
IOException - If an I/O error occurs |
| write | | public void write(String s, int off, int len) throws IOException(Code) | | Writes a portion of a String.
If the value of the len parameter is negative then no
characters are written. This is contrary to the specification of this
method in the
, which requires that an
IndexOutOfBoundsException be
thrown.
Parameters:
s - String to be written
Parameters:
off - Offset from which to start reading characters
Parameters:
len - Number of characters to be written
exception:
IOException - If an I/O error occurs |
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