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Subclasses of FilterInputStream are used to add value to a raw InputStream. You can define your own filters but useful ones are already provided in java.io:
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BufferedInputStream -- establishes an intermediate buffer to service the stream
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DataInputStream -- has methods to input other data types besides bytes (char, double, boolean, etc.)
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PushbackInputStream -- allows one to "unread" a byte and put it back in the input stream
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These streams may be "chained" for added functionality:
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DataInputStream in =
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new DataInputStream (new FileInputStream(file));
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or
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BufferedInputStream in =
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new BufferedInputStream (new FileInputStream(file));
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where file is a filename string.
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