This cheat sheet, from Princeton University's Introduction to Programming in Java course, makes a great reference for the basics you need to know, like structure, input/output, data types, and ...

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

Object Oriented Java Programming: Data Structures and Beyond Specialization. Coursera. Provider ... This is a free cheat sheet of basic Java definitions, terms, keywords and more.