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Java Platform 1.2 Beta 4 |
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java.lang.Object | +--java.io.Writer | +--java.io.BufferedWriter
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.
PrintWriter
,
FileWriter
,
OutputStreamWriter
Fields inherited from class java.io.Writer | |
lock |
Constructor Summary | |
BufferedWriter(Writer out,
int sz)
Create a new buffered character-output stream that uses an output buffer of the given size. |
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BufferedWriter(Writer out)
Create a buffered character-output stream that uses a default-sized output buffer. |
Method Summary | |
void | close()
Close the stream. |
void | flush()
Flush the stream. |
void | newLine()
Write a line separator. |
void | write(char[] cbuf,
int off,
int len)
Write a portion of an array of characters. |
void | write(int c)
Write a single character. |
void | write(String s,
int off,
int len)
Write a portion of a String. |
Methods inherited from class java.io.Writer | |
write , write |
Methods inherited from class java.lang.Object | |
clone , equals , finalize , getClass , hashCode , notify , notifyAll , toString , wait , wait , wait |
Constructor Detail |
public BufferedWriter(Writer out)
out
- A Writerpublic BufferedWriter(Writer out, int sz)
out
- A Writer
sz
- Output-buffer size, a positive integerMethod Detail |
public void write(int c) throws IOException
public void write(char[] cbuf, int off, int len) throws IOException
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
BufferedWriter
s will not copy data unnecessarily.
cbuf
- A character array
off
- Offset from which to start reading characters
len
- Number of characters to writepublic void write(String s, int off, int len) throws IOException
s
- String to be written
off
- Offset from which to start reading characters
len
- Number of characters to be writtenpublic void newLine() throws IOException
public void flush() throws IOException
public void close() throws IOException
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Java Platform 1.2 Beta 4 |
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