Enthuware

This question should give a little more details about why the answer is 4. For what I have understand, the expression "glob:*.java" will not cross directories, so it will only match the file a.java. If we want to match all of the files in the sub directories, we should use "glob:**.java".


Thanks

Curious about this one too.

It is not the glob pattern that is making it cross the directories. It is the Files.walkFileTree method that makes it travel each level under the given path. The glob pattern only matches *.java in the same directory.

HTH,
Paul.

Cheers, thanks for your explanation.

But how can we say it will cross directory or not by looking at walkFileTree method ? what is essence in this question?

We can say that by go through the JavaDoc API description of walkFileTree method.

What is the difference between Files.walk() and Files.walkFileTree() methods?

Thanks in advance.

Check out the JavaDoc of both:
https://docs.oracle.com/javase/8/docs/a ... isitOption...-
and
https://docs.oracle.com/javase/8/docs/a ... leVisitor-