Java

This is a printer-friendly version. It omits exercises, optional topics (i.e., four-star topics), and other extra content such as learning outcomes.

Varargs :

Variable Arguments (Varargs) is a syntactic sugar type feature that allows writing a methods that can take a variable number of arguments.

The search method below can be called as search(), search("book"), search("book", "paper"), etc. 

public static void search(String ... keywords){
   // method body
}

Resources:

JavaFX: Basic

JavaFX is a technology for building Java-based GUIs. Previously it was a part Java itself, but has become a third-party dependency since then. It is now being maintained by OpenJDK.

Streams: Basic :

Java 8 introduced a number of new features (e.g. Lambdas, Streams) that are not trivial to learn but also extremely useful to know.

Here is an overview of new Java 8 features .(written by Benjamin Winterberg)