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01
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How is Decorator pattern applied in Reader/Writer class hierarchy in Java?
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A.
Java I/O does not use Decorator pattern; each class independent with different interface
B.
FilterReader/FilterWriter Decorator role; BufferedReader, LineNumberReader concrete decorator; responsibility added with chaining
C.
BufferedReader extends FileReader; uses inheritance not wrapping
D.
Java I/O class hierarchy designed with Singleton pattern; unrelated to Decorator
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