The union of state and behavior.
"Open, Reusable Object Models" (2-column)
THE UNIVERSE IS AN OBJECT-ORIENTED SYSTEM
How Multicore CPUs Changed Object-Oriented Programming: "Object-oriented programming dominated for decades, but the multicore revolution exposed a critical flaw in classical OOP: shared mutable state through implicit references. Modern languages refined OOP with value semantics, composition, and explicit sharing to make concurrency safe by default. ... The argument isn’t “multicore killed OOP” - it’s “multicore forced OOP to evolve.” What changed: reference-everywhere became value-by-default. What stayed: methods, encapsulation, abstraction."
Last modified 15 June 2026