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Hidden, Exposed Aspects of Objects - Exercise

Encapsulation: hidden and exposed aspects of objects

Objective:Identify which aspects of two common objects are hidden or exposed.

Exercise Scoring

This exercise is worth a total of 10 points.

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Identify the aspects of each of the following devices that must be exposed/should be hidden.
  1. TV (television set)
  2. VCR (video cassette recorder)


Model your answers on the example below:
  1. Telephone
  2. Expose
  3. Purpose:
  1. To enable communication across phone lines


  1. Initiate a call
  2. Terminate a call
  3. Place a call
  1. The implementation of the conversion of the button manipulations to electronic signals and the data used to control the conversion details
  2. The implementation of the initiation of a call and the data it uses to perform the connection
  3. The caller ID data
  4. The implementation of the call termination process and the associated data

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