What is Java? Java is an object-oriented programming language developed by Sun Microsystems in the 1990s (later purchased by Oracle).

Java is an ‘object oriented’ programming language. That means that it’s built from many objects that interact with each other, rather than being a long list of instructions.

Becoming popular in the early 1990s and the norm today, object-oriented programming (OOP) languages, such as C++ and Java, provide a formal set of rules for creating and managing objects.

Here's what you need to know about object-oriented programming with classes, methods, objects, and interfaces, with examples in Java, Python, and TypeScript.

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The Java programming language emerged roughly 25 years ago, when Smalltalk and C++ dominated. Back then it was easy to argue that the world didn't need another object-oriented programming language.