Object-oriented programming: Difference between revisions

Revision as of 23:55, 16 October 2022

Revision as of 08:48, 19 October 2022

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Data Abstraction is a design pattern in which data are visible only to semantically related functions, so as to prevent misuse. The success of data abstraction leads to frequent incorporation of [[Information hiding|data hiding]] as a design principle in object oriented and pure functional programming.

If a class does not allow calling code to access internal object data and permits access through methods only, this is a strong form of abstraction or information hiding known as [[abstractionAbstraction (object-orientedcomputer programmingscience)|abstraction]]. Some languages (Java, for example) let classes enforce access restrictions explicitly, for example denoting internal data with the <code>private</code> keyword and designating methods intended for use by code outside the class with the <code>public</code> keyword. Methods may also be designed public, private, or intermediate levels such as <code>protected</code> (which allows access from the same class and its subclasses, but not objects of a different class). In other languages (like Python) this is enforced only by convention (for example, <code>private</code> methods may have names that start with an [[underscore]]).

===Encapsulation===