[user5994461]

>>> class vs interface

This is java specific, that's not OOP.

[jve]

Interface is a means to achieve OOP. 2 more languages pops off my head:

C#: https://docs.microsoft.com/en-us/dotnet/csharp/language-refe... TypeScript: https://www.typescriptlang.org/docs/handbook/interfaces.html