There is a reason why Java method modifiers exist. If you call public methods internally and don't understand why, your developers could face major class issues.

Use Java assertions to test your assumptions about program correctness and check them in your code.

Method and variable handles vs. Java reflection To truly understand MethodHandles and VarHandles —what they do and why they are useful—it’s helpful to know a few things about reflection in Java.

The example code below shows how to use Java’s DirectoryStream in a method to list the files of a directory: public Set<String> listFilesUsingDirectoryStream(String dir) throws IOException { ...