5 Binary Standard Java has a binary standard. In addition to being loadable as a class by a Java Virtual Machine, a Java Classfile can be used to compile against. C++ has no binary standard.

Abstract classes and interfaces in Java serve fundamentally different purposes. Learn the differences between these Java language elements and how to use them in your programs.

Java provides a comprehensive standard library (Java Standard Edition, or Java SE) that includes built-in classes and libraries for common tasks such as file I/O, networking, and data manipulation.

It's a bit unclear what you mean when you say "what can I do". If you're referring to specific language features that are available to Java or C++ that are not available to JavaScript, it would be ...