Classes, fields, methods, constructors, and objects are the building blocks of object-based Java applications. This Java tutorial teaches you how to declare classes, describe attributes via fields ...

In Java terms, Kotlin classes are final by default. Default public members and default final classes could be interpreted as subtle encouragement to prefer composition over inheritance .

Googling for "Java return multiple values" reveals people like some "javatuples" library. I have not played with records yet, but if you are using Java >= 16, I would test using records. More options ...

Eclipse causes a java.lang.NullPointerException: Cannot invoke "java.io.Console.readLine()" because the return value of "java.lang.System.console()" is null Console Java User Input Example Failed.