When Was Object-Oriented Programming Language Introduced?


Angela Bailey

Object-oriented programming (OOP) revolutionized the way we design and develop software. It introduced a paradigm shift in programming languages, making them more modular, scalable, and easier to maintain. In this article, we will delve into the history of OOP and explore when it was first introduced.

What is Object-Oriented Programming?
Object-oriented programming is a programming paradigm that structures code around objects, which are instances of classes. In OOP, objects encapsulate data and behavior, allowing for better organization and reusability of code. This approach promotes modularity, extensibility, and flexibility in software development.

The Birth of Object-Oriented Programming
The concept of OOP was first conceived in the late 1960s by Ole-Johan Dahl and Kristen Nygaard at the Norwegian Computing Center in Oslo. They developed a programming language called SIMULA 67, which is widely regarded as the first object-oriented programming language.

SIMULA 67: The First Object-Oriented Programming Language

SIMULA 67 was designed to support simulation and modeling tasks. It introduced key concepts that are now fundamental to object-oriented programming, such as classes, objects, inheritance, and dynamic dispatch.

SIMULA 67 introduced the notion of classes as templates or blueprints for creating objects. A class defined both the data structure (attributes) and behavior (methods) associated with an object.

Objects were instances of classes in SIMULA 67. They encapsulated both data (attributes) and behavior (methods) specific to their class.

SIMULA 67 also introduced inheritance, allowing classes to inherit attributes and methods from other classes. This feature promoted code reuse and hierarchy establishment.

Dynamic Dispatch:
Dynamic dispatch enabled runtime selection of appropriate methods based on the actual type of the object. This concept laid the foundation for polymorphism in OOP.

OOP Beyond SIMULA 67

While SIMULA 67 pioneered object-oriented programming, it was not widely adopted outside the simulation and modeling community. However, its concepts and ideas heavily influenced subsequent programming languages.

Smalltalk: The Birth of Modern Object-Oriented Programming

In the 1970s, Alan Kay and his team at Xerox PARC developed Smalltalk, a programming language that took OOP to new heights. Smalltalk refined many concepts introduced in SIMULA 67 and added new features like message passing and a graphical user interface. It is often credited as the birthplace of modern object-oriented programming.

C++: Bringing OOP to Mainstream Development

C++, created by Bjarne Stroustrup in the early 1980s, combined object-oriented features with the power of the C programming language. C++ brought OOP into mainstream development, offering a powerful toolset for software development across various domains.

Java: Platform-Independent Object-Oriented Programming

In 1995, Java was introduced by James Gosling at Sun Microsystems (now Oracle). Java expanded on the concepts of C++ and brought platform independence through its “write once, run anywhere” mantra. Java’s popularity skyrocketed due to its robustness, security features, and wide range of libraries.


Object-oriented programming has come a long way since its inception with SIMULA 67. Its concepts have permeated numerous programming languages, enabling developers to build complex systems efficiently. Today, OOP is widely used across various industries and continues to evolve with new languages and frameworks emerging regularly.

  • OOP introduced a paradigm shift in software development.
  • SIMULA 67 was the first object-oriented programming language.
  • Key concepts like classes, objects, inheritance, and dynamic dispatch were introduced in SIMULA 67.
  • Smalltalk and C++ further refined and popularized OOP.
  • Java made OOP platform-independent and widely adopted in the industry.

Whether you’re a beginner or an experienced developer, understanding the history of OOP can provide valuable insights into its evolution and help you leverage its power in your own projects. So keep exploring, learning, and pushing the boundaries of object-oriented programming!

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