ABCs of OOP Objects

Object Visibility

OOP objects mimic (imitate) real world objects:

Like real world objects, OOP objects can be:

1. VISIBLE – can be seen by a user (e.g., a house, car, etc.)
   
   
2. INVISIBLE – cannot be seen DIRECTLY by a user (time, date).
   
   NOTE: Invisible objects, however, can be seen through other visible objects (e.g., a clock, watch, phone, computer, etc.)
   
   
3. NEITHER – loosely speaking, neither visible nor invisible (e.g., sound)
   
   NOTE: Sound can not be seen but only heard by means of another visible object (e.g., a speaker, headset, radio, or TV)

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