All Implemented Interfaces:

Closeable, Flushable, Appendable, AutoCloseable
```
public class BufferedWriter
extends Writer
```
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.
Since:

JDK1.1

See Also:
PrintWriter, FileWriter, OutputStreamWriter, Files.newBufferedWriter(java.nio.file.Path, java.nio.charset.Charset, java.nio.file.OpenOption...)

Field Summary
- Fields inherited from class java.io.Writer lock

Constructor Summary

Constructors
Constructor and Description
`BufferedWriter(Writer out)` Creates a buffered character-output stream that uses a default-sized output buffer.
`BufferedWriter(Writer out, int sz)` Creates a new buffered character-output stream that uses an output buffer of the given size.

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Method Summary

Methods
Modifier and Type	Method and Description
`void`	`close()` Closes the stream, flushing it first.
`void`	`flush()` Flushes the stream.
`void`	`newLine()` Writes a line separator.
`void`	`write(char[] cbuf, int off, int len)` Writes a portion of an array of characters.
`void`	`write(int c)` Writes a single character.
`void`	`write(String s, int off, int len)` Writes a portion of a String.

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Methods inherited from class java.io.Writer append, append, append, write, write

Methods inherited from class java.lang.Object clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - BufferedWriter
    public BufferedWriter(Writer out)
    
    Creates a buffered character-output stream that uses a default-sized output buffer.
    
    Parameters:
    out - A Writer
  - BufferedWriter
    public BufferedWriter(Writer out, int sz)
    
    Creates 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
- Method Detail
  - write
    public void write(int c) throws IOException
    
    Writes a single character.
    
    Overrides:
    
    write in class Writer
    
    Parameters:
    c - int specifying a character to be written
    
    Throws:
    
    IOException - If an I/O error occurs
  - write
    public void write(char[] cbuf, int off, int len) throws IOException
    
    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.
    
    Specified by:
    
    write in class Writer
    
    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
  - write
    public void write(String s, int off, int len) throws IOException
    
    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 superclass, which requires that an IndexOutOfBoundsException be thrown.
    
    Overrides:
    
    write in class Writer
    
    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
  - newLine
    public void newLine() throws IOException
    
    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.
    
    Throws:
    
    IOException - If an I/O error occurs
  - flush
    public void flush() throws IOException
    
    Flushes the stream.
    
    Specified by:
    
    flush in interface Flushable
    
    Specified by:
    
    flush in class Writer
    
    Throws:
    
    IOException - If an I/O error occurs
  - close
    public void close() throws IOException
    
    Description copied from class: 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.
    
    Specified by:
    
    close in interface Closeable
    
    Specified by:
    
    close in interface AutoCloseable
    
    Specified by:
    
    close in class Writer
    
    Throws:
    
    IOException - If an I/O error occurs

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Dokument erstellt 11/06/2005, zuletzt geändert 04/03/2020
Quelle des gedruckten Dokuments:https://www.gaudry.be/de/java-api-rf-java/io/BufferedWriter.html

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Referenzen

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Inhaltsverzeichnis Haut

Class BufferedWriter

Referenzen