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Class java.io.BufferedWriter

java.lang.Object
   |
   +----java.io.Writer
           |
           +----java.io.BufferedWriter

public class BufferedWriter

extends Writer

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")));
 

Since:

JDK1.1

See Also:

PrintWriter, FileWriter, OutputStreamWriter

BufferedWriter(Writer)

Create a buffered character-output stream that uses a default-sized output buffer.

BufferedWriter(Writer, int)

Create a new buffered character-output stream that uses an output buffer of the given size.

close()

Close the stream.

flush()

Flush the stream.

newLine()

Write a line separator.

write(char[], int, int)

Write a portion of an array of characters.

write(int)

Write a single character.

write(String, int, int)

Write a portion of a String.

 public BufferedWriter(Writer out)

Create a buffered character-output stream that uses a default-sized output buffer.

Parameters:

out - A Writer

 public BufferedWriter(Writer out,
                       int sz)

Create a new buffered character-output stream that uses an output buffer of the given size.

Parameters:

out - A Writer

sz - Output-buffer size, a positive integer

Throws: IllegalArgumentException

If sz is <= 0

 public void write(int c) throws IOException

Write a single character.

Throws: IOException

If an I/O error occurs

Overrides:

write in class Writer

 public void write(char cbuf[],
                   int off,
                   int len) throws IOException

Write 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

off - Offset from which to start reading characters

len - Number of characters to write

Throws: IOException

If an I/O error occurs

Overrides:

write in class Writer

 public void write(String s,
                   int off,
                   int len) throws IOException

Write a portion of a String.

Parameters:

s - String to be written

off - Offset from which to start reading characters

len - Number of characters to be written

Throws: IOException

If an I/O error occurs

Overrides:

write in class Writer

 public void newLine() throws IOException

Write a line separator. The line separator string is defined by the system property line.separator, and is not necessarily a single newline ('\n') character.

Throws: IOException

If an I/O error occurs

 public void flush() throws IOException

Flush the stream.

Throws: IOException

If an I/O error occurs

Overrides:

flush in class Writer

 public void close() throws IOException

Close the stream.

Throws: IOException

If an I/O error occurs

Overrides:

close in class Writer

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