Get a deep dive into using method references in your Java programs, including stream operations, event listeners, and constructors and factories. Topics Spotlight: New Thinking about Cloud Computing ...

Use Java assertions to test your assumptions about program correctness and check them in your code. ... For private helper methods, you can enforce preconditions by specifying assertions.

Java 8 introduced a new list() method in java.nio.file.Files. The list method returns a lazily populated Stream of entries in the directory. As such, it is more efficient for processing large folders.