Here's how to make classes, fields, methods, constructors, and objects work together in your Java programs.

This post explains how to call a method in Java. Learn how to define methods, call them from other classes, and pass arguments!

Use Java assertions to test your assumptions about program correctness and check them in your code.

There is a reason why Java method modifiers exist. If you call public methods internally and don't understand why, your developers could face major class issues.