157. Polymorphism-ii

Question.4

A developer defines a bloated base class:

class IDevice {
public:
   virtual void read() = 0;
   virtual void write() = 0;
   virtual void configure() = 0;
   virtual void sleep() = 0;
   virtual void calibrate() = 0;
};

A simple LED driver must implement all 5 methods even though it only needs write(). What is wrong?

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The interface needs default implementations
LED should not use polymorphism
Interface is too fat -- LED is forced to implement read(), calibrate(), etc. which are meaningless for it. Split into smaller focused interfaces (IWritable, IReadable, ICalibratable)
Nothing -- all methods should be in one interface

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