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Filtering Streams
in Java


Prof. David Bernstein
James Madison University

Computer Science Department
bernstdh@jmu.edu

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Filtering Input
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  • FilterInputStream java.io.FilterInputStream
    • Parent of all filtered input streams
    • By default, performs a simple pass-thru
  • To Filter:
    • Use the protected InputStream in
    • Override: 
                    int read()
      
              int read(byte[] b, int off, int len)
Filtering Output
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  • FilterOutputStream java.io.FilterOutputStream
    • Parent of all filtered output streams
    • By default, performs a simple pass-thru
  • To Filter:
    • Use the protected OutputStream out
    • Override: 
                    void write(byte[] b, int off, int len
      
              void write(byte[] b)
An Example
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A Seven-Bit Input Stream

javaexamples/io/SevenBitInputStream.java
 
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