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minor discrepancy?

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Just wondering if anyone else had noticed the constructor for the FileDescriptor class. Im not sure but i think but my RHE book back section says there's an int argument for the constructor but the sun API has no such constructor, only default with no argument. Just wondering which one I should follow..
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In my studying for the exam, the only place I came across a FileDescriptor Obj is in the constructors of FileInputStream/OutputStream and FileReader/Writer and the only place I found those constructors were in Velmurigan's notes. RHE didn't have it in the index, nor did they have it in the section on streams. I couldn't find it in the Exam Cram index, or Khalid index either. I never came across it on the exam either, so I'm not sure if it's included in the objectives. Maybe someone else can shed some light on this.
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