paxjunky.blogg.se

The code part defines a collection of named subroutines called METHODS which have access to the instance variables and may manipulate their contents.

Imagine a class as being like a cl1equebook then creating a new instance means tearing out one cheque and filling it in. At run time these will be filled with different values representing the properties of each individual object. The data part describes a collection of named slots called INSTANCE VARIABLES, copies of which will be contained in every INSTANCE (Le. A class definition is in two parts, a data part and a code part. Other important OOPLs include JAVA, OBJECT PASCAL, EIFFEL, and the historically important SMALLTALK.Ī class is a template that describes the structure and behaviour of any number of similar objects, which are bundles of related data values. The first such OOPL to be invented was SIMULA, and the most widely used OOPL today is C++, which is a derivative of the C language with added object-oriented features. Such languages typically support three features not found in traditional programming languages: CLASSES, ENCAPSULATION and INHERITANCE, though the actual constructs that embody these features may have different names in different languages. (OOPL) A programming language specifically designed to support the writing of OBJECT-ORIENTED programs.