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Programming

Objects, classes and methods

  • 3 things to know
  • AS Unit 1

Overview

Object in object-oriented programming, class and an object and sending a message to an object.

What you need to know

Answer each one before you reveal it.

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Key term

Distinguish between a class and an object.

Key term

What is an attribute?

Key term

Define encapsulation.

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is an object in object-oriented programming?

    Model answer

    An object is a self-contained software item that holds its own data together with the operations that act on that data, and it usually stands for one real-world thing such as a single customer.

  2. 2

    What is a class?

    Model answer

    A class is a template that defines the attributes and the methods every object of that kind will have, and no data is stored until an object is created from it.

  3. 3

    What is meant by instantiation?

    Model answer

    Instantiation is the creation of one individual object from a class, giving that object its own copy of the attributes the class describes.

  4. 4

    Distinguish between a class and an object.

    Model answer

    A class is the general description written once by the programmer, while an object is one particular item built to that description and holding values of its own.

  5. 5

    What is an attribute?

    Model answer

    An attribute is a data item belonging to an object, such as the name or the balance of a bank account, and every object holds its own value for it.

  6. 6

    What is a method?

    Model answer

    A method is a procedure or function defined inside a class that carries out one of the operations an object can perform, such as paying an amount into an account.

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