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

How about comparing the paths?

    boolean areRelated = file.getAbsolutePath().contains(dir.getAbsolutePath());
    System.out.println(areRelated);

or

boolean areRelated = child.getAbsolutePath().startsWith(parent.getAbsolutePath())