JNI allows the use of function libraries made in languages such as C, C++, VB from Java applications. The advantage of JNI is that you don't need to write the calling function definition in Java.

Note that the forEach method in Java’s Iterable interface (which List extends) expects a single argument that matches the Consumer functional interface you saw in a previous example.

The Class File API provides the basic functions in Java Core in a future-proof way, but is not intended to replace the external libraries with their more extensive functions.

It’s easy to remove duplicates from a list in Java. There are a variety of functions in Java that simplify that process. Finding duplicates in a Java list? That’s actually a bit more complicated, but ...