Check if file is in (sub)directory

Question

I would like to check whether an existing file is in a specific directory or a subdirectory of that.

I have two File objects.

File dir;
File file;
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Answer 1

You can traverse File Tree starting from your specific DIR. At Java 7, there is Files.walkFileTree method. You have only to write your own visitor to check if current node is searched file. More doc: http://docs.oracle.com/javase/7/docs/api/java/nio/file/Files.html#walkFileTree%28java.nio.file.Path,%20java.util.Set,%20int,%20java.nio.file.FileVisitor%29