Lazy iterator over files in directory structure

Asked Jan 24 '19 at 14:01

Active Jan 24 '19 at 14:01

Viewed 239 times

There are related questions, but none of them addresses the "lazy" part, that is, discover more content only as the iteration progresses.

See How do I iterate through the files in a directory in Java?

Also Apache Commons FileUtils.iterateFiles() reads all files into a Collection (List) at first before getting the Iterator on that.

I have a nested directory structure with a large amount of files (2 million). My goal is to iterate the files without having to read all the names into a collection.

asked Jan 24 '19 at 14:01

joopRksn

Python os.walk? :) – Mad Physicist Jan 24 '19 at 14:06
@MadPhysicist: I don't think OP wants to wait two hours until it's finished :) – Tobias Brösamle Jan 24 '19 at 14:10
@Tobias. Then why use Java? :) – Mad Physicist Jan 24 '19 at 14:22
@MadPhysicist: Right, you're correct. But even for Python, os.walk is REALLY slow. – Tobias Brösamle Jan 24 '19 at 14:24
@Tobias. I haven't noticed it to be so. – Mad Physicist Jan 24 '19 at 14:26
@joopRksn, welcome to Stack Overflow. Take a time to read https://stackoverflow.com/help/how-to-ask and improve your question. You might want to explain more about what you mean by lazy loading, maybe giving an example with Stream... – ericbn Jan 25 '19 at 00:06
Not a single answer for a question about such basic functionality? Unreal... – Борат Сагдиев Oct 14 '22 at 20:40

Lazy iterator over files in directory structure

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