Computer Science : Object-Oriented Development
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Example Question #1 : Implementation Techniques
Consider the following C++ pseudocode:
Class Car {
const int wheels = 4;
float milesPerGallon;
string make;
string model;
}
Car sportscar = new Car;
What is the difference between the class car, and the object sportscar?
They are the same.
They have no relation.
Car is instantiated from sportscar.
sportscar is instantiated from Car.
They are both instantiated from something else.
sportscar is instantiated from Car.
When programming within the Object-Oriented paradigm, think of the class as a blueprint, and the object as a house built from that blueprint.
The class Car is a abstract specification that does not refer to any one particular instance. It is merely a protocol that all objects wishing to be cars should follow. The sportscar object is a realization of the car blueprint. It is a specific instance. In programming jargon, "sportscar is instantiated from Car."
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