Composition
It is natural to think of objects as containing other objects. A television set contains a tuner and video display. A computer contains video cards, keyboards, and drives. The computer can be considered an object unto itself, and a flash drive is also considered a valid object. You could open up the computer and remove the hard drive and hold it in your hand. In fact, you could take the hard drive to another computer and install it. The fact that it is a standalone object is reinforced because it works in multiple computers.
The classic example of object composition is the automobile. Many books, training classes, and articles seem to use the automobile as the epitome of object composition. Besides the original interchangeable manufacture ...
Get The Object-Oriented Thought Process, Fourth Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
