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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » java.io 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   java.io.Reader
      java.io.BufferedReader

All known Subclasses:   java.io.LineNumberReader,
BufferedReader
public class BufferedReader extends Reader (Code)
Read text from a character-input stream, buffering characters so as to provide for the efficient reading of characters, arrays, and lines.

The buffer size may be specified, or the default size may be used. The default is large enough for most purposes.

In general, each read request made of a Reader causes a corresponding read request to be made of the underlying character or byte stream. It is therefore advisable to wrap a BufferedReader around any Reader whose read() operations may be costly, such as FileReaders and InputStreamReaders. For example,

 BufferedReader in
 = new BufferedReader(new FileReader("foo.in"));
 
will buffer the input from the specified file. Without buffering, each invocation of read() or readLine() could cause bytes to be read from the file, converted into characters, and then returned, which can be very inefficient.

Programs that use DataInputStreams for textual input can be localized by replacing each DataInputStream with an appropriate BufferedReader.
See Also:   FileReader
See Also:   InputStreamReader
version:
   1.29 10/10/01
author:
   Mark Reinhold
since:
   JDK1.1




Constructor Summary
public  BufferedReader(Reader in, int sz)
     Create a buffering character-input stream that uses an input buffer of the specified size.
public  BufferedReader(Reader in)
     Create a buffering character-input stream that uses a default-sized input buffer.

Method Summary
public  voidclose()
     Close the stream.
public  voidmark(int readAheadLimit)
     Mark the present position in the stream.
public  booleanmarkSupported()
     Tell whether this stream supports the mark() operation, which it does.
public  intread()
     Read a single character.
public  intread(char cbuf, int off, int len)
     Read characters into a portion of an array.

This method implements the general contract of the corresponding Reader.read(char[]intint) read method of the Reader class.

 StringreadLine(boolean ignoreLF)
     Read a line of text.
public  StringreadLine()
     Read a line of text.
public  booleanready()
     Tell whether this stream is ready to be read.
public  voidreset()
     Reset the stream to the most recent mark.
public  longskip(long n)
     Skip characters.


Constructor Detail
BufferedReader
public BufferedReader(Reader in, int sz)(Code)
Create a buffering character-input stream that uses an input buffer of the specified size.
Parameters:
  in - A Reader
Parameters:
  sz - Input-buffer size
exception:
  IllegalArgumentException - If sz is <= 0



BufferedReader
public BufferedReader(Reader in)(Code)
Create a buffering character-input stream that uses a default-sized input buffer.
Parameters:
  in - A Reader




Method Detail
close
public void close() throws IOException(Code)
Close the stream.
exception:
  IOException - If an I/O error occurs



mark
public void mark(int readAheadLimit) throws IOException(Code)
Mark the present position in the stream. Subsequent calls to reset() will attempt to reposition the stream to this point.
Parameters:
  readAheadLimit - Limit on the number of characters that may beread while still preserving the mark. Afterreading this many characters, attempting toreset the stream may fail. A limit value largerthan the size of the input buffer will cause anew buffer to be allocated whose size is nosmaller than limit. Therefore large valuesshould be used with care.
exception:
  IllegalArgumentException - If readAheadLimit is < 0
exception:
  IOException - If an I/O error occurs



markSupported
public boolean markSupported()(Code)
Tell whether this stream supports the mark() operation, which it does.



read
public int read() throws IOException(Code)
Read a single character. The character read, as an integer in the range0 to 65535 (0x00-0xffff), or -1 if theend of the stream has been reached
exception:
  IOException - If an I/O error occurs



read
public int read(char cbuf, int off, int len) throws IOException(Code)
Read characters into a portion of an array.

This method implements the general contract of the corresponding Reader.read(char[]intint) read method of the Reader class. As an additional convenience, it attempts to read as many characters as possible by repeatedly invoking the read method of the underlying stream. This iterated read continues until one of the following conditions becomes true:

  • The specified number of characters have been read,
  • The read method of the underlying stream returns -1, indicating end-of-file, or
  • The ready method of the underlying stream returns false, indicating that further input requests would block.
If the first read on the underlying stream returns -1 to indicate end-of-file then this method returns -1. Otherwise this method returns the number of characters actually read.

Subclasses of this class are encouraged, but not required, to attempt to read as many characters as possible in the same fashion.

Ordinarily this method takes characters from this stream's character buffer, filling it from the underlying stream as necessary. If, however, the buffer is empty, the mark is not valid, and the requested length is at least as large as the buffer, then this method will read characters directly from the underlying stream into the given array. Thus redundant BufferedReaders will not copy data unnecessarily.
Parameters:
  cbuf - Destination buffer
Parameters:
  off - Offset at which to start storing characters
Parameters:
  len - Maximum number of characters to read The number of characters read, or -1 if the end of thestream has been reached
exception:
  IOException - If an I/O error occurs




readLine
String readLine(boolean ignoreLF) throws IOException(Code)
Read a line of text. A line is considered to be terminated by any one of a line feed ('\n'), a carriage return ('\r'), or a carriage return followed immediately by a linefeed.
Parameters:
  ignoreLF - If true, the next '\n' will be skipped A String containing the contents of the line, not includingany line-termination characters, or null if the end of thestream has been reached
See Also:   java.io.LineNumberReader.readLine
exception:
  IOException - If an I/O error occurs



readLine
public String readLine() throws IOException(Code)
Read a line of text. A line is considered to be terminated by any one of a line feed ('\n'), a carriage return ('\r'), or a carriage return followed immediately by a linefeed. A String containing the contents of the line, not includingany line-termination characters, or null if the end of thestream has been reached
exception:
  IOException - If an I/O error occurs



ready
public boolean ready() throws IOException(Code)
Tell whether this stream is ready to be read. A buffered character stream is ready if the buffer is not empty, or if the underlying character stream is ready.
exception:
  IOException - If an I/O error occurs



reset
public void reset() throws IOException(Code)
Reset the stream to the most recent mark.
exception:
  IOException - If the stream has never been marked,or if the mark has been invalidated



skip
public long skip(long n) throws IOException(Code)
Skip characters.
Parameters:
  n - The number of characters to skip The number of characters actually skipped
exception:
  IllegalArgumentException - If n is negative.
exception:
  IOException - If an I/O error occurs



Fields inherited from java.io.Reader
protected Object lock(Code)(Java Doc)

Methods inherited from java.io.Reader
abstract public void close() throws IOException(Code)(Java Doc)
public void mark(int readAheadLimit) throws IOException(Code)(Java Doc)
public boolean markSupported()(Code)(Java Doc)
public int read() throws IOException(Code)(Java Doc)
public int read(char cbuf) throws IOException(Code)(Java Doc)
abstract public int read(char cbuf, int off, int len) throws IOException(Code)(Java Doc)
public boolean ready() throws IOException(Code)(Java Doc)
public void reset() throws IOException(Code)(Java Doc)
public long skip(long n) throws IOException(Code)(Java Doc)

Methods inherited from java.lang.Object
public boolean equals(Object obj)(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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