Simula (1967) is generally accepted when a foremost language to keep around a primary features of an object-oriented language. It was created for making simulation programs, in which what come to become known as objects were a first references representation. Smalltalk (1972 to 1980) is arguably a canonical case, & the 1 sustaining which lot of the theory of object-oriented programming was developed.

OO languages may be grouped into many wide classes, determined per extent to which it trend lines a lot features & functionality of object-orientation & objects: classes, methods, polymorphism, inheritance, and reusability. Languages known as "Pure" OO languages, because all about within the two is treated systematically an object, from either primitives like characters & punctuation, all the way as much as completely classes, image, hinders, modules, etc. It were designed specifically to help, potentially enforce, OO methods. Examples: Smalltalk, Eiffel, Ruby. Languages designed in the main for OO programming, however by having a select few procedural elements. Examples: Java, Python. Languages that come historically procedural languages, but own been extended by owning occasionally OO features. Examples: C++, Fortran 2003, Perl. Languages by using virtually all of the features of objects (classes, methods, inheritance, reusability), however within the distinctly original, potentially elegant, form. Examples: Oberon, and successor Oberon-2. Languages using abstract data type support, but not all features of object-orientation, periodically known as object-depending languages. Examples: Modula-2 (with first-class encapsulation & facts concealment), Pliant.

Inheritance & polymorphism are usually wont to reduce code bloat. Abstraction and encapsulation are used to increase code clarity, quite independent of the more ii traits.

Languages with object-oriented features
Ada 95 BETA Boo C++ C# ColdFusion Common Lisp COOL (Object Oriented COBOL) CorbaScript Corn D Delphi Dylan Eiffel F-Script Fortran 2003 Gambas IDLscript incr Tcl J JADE Java Join Java Lava Lexico Lingo Modula-2 Modula-3 Objective Modula-2 NetRexx Oberon Oberon-2 Object REXX Objective-C Objective Caml Oz Mozart Programming System Perl 5 PHP Pliant PowerBuilder Prototype-based languages Actor-Depending Co-occurrent Language, ABCL: ABCL/1, ABCL/R, ABCL/R2, ABCL/c+ Agora Cecil Cel ECMAScript a.k.a. ActionScript, DMDScript, JavaScript, JScript Io Lua MOO NewtonScript Obliq REBOL Self Python REALbasic Revolution Ruby Sather Scala Simula Smalltalk Self Bistro Squeak STOOOP (Tcl extension) Superx++ TADS Ubercode Visual Basic VB.NET VBScript Visual FoxPro Visual Prolog XOTcl ZZT-oop

Implementing designs expressed in UML
A Unified Modeling Language (UML) is a language-agnostic, non-proprietary modeling language that can be utilized to project object-oriented systems. These are typically esteem a complete specification of OO, as an abstract project expressed around UML could ideally exist as implemented in any OO programing language.

UML specifies, among more items, the placed of component types & relationships. There exists presently there are no known OO language that inherently (i personally.e. forswearing important manual effort) supports a to the full OO capability. Features occasionally lacking include:

Correct behaviour for the various component relationships (aggregation, composition). Polymorphism on message arguments.

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