Basic HTML version of Foils prepared 18 May 97

Foil 27 FilterInputStreams

From Java Tutorial - Spring 1997 Part 4: Multithreading, useful Java classes, I/O, Networking, and the future Peking Tutorial, Web Certificate -- Spring-Summer 1997. by Nancy J. McCracken,Geoffrey C. Fox


There is a clever class called FilterInputStream which can be used to add value to a raw InputStream. You can define your own filters but important ones provided are:
  • BufferedInputStream -- establishs an intermediate buffer to service stream
  • DataInputStream -- allows one to address stream in terms of higher level constructs -- namely read a line, read a long integer etc.
  • LineNumberInputStream -- adds line numbers to a stream
  • PushbackInputStream -- allows one to "unread" a character and put it back on the input stream
These streams can be constructed from each other or InputStream to give added functionality. If "is" is an InputStream, then it can be converted to a buffered input stream with methods from datainputstream:
DataInputStream data = new DataInputStream(new BufferedInputSream(is));



© Northeast Parallel Architectures Center, Syracuse University, npac@npac.syr.edu

If you have any comments about this server, send e-mail to webmaster@npac.syr.edu.

Page produced by wwwfoil on Thu Jan 8 1998