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Classic programmed-learning exercises, refreshed for modern Java and presented in the current MrStyner.com portfolio style.

Modern Java noteThis archive has been refreshed for Java 25 LTS. Core language concepts remain useful, while outdated setup instructions and browser-era Java are labeled or replaced. Java 26 is the current feature release; Java 25 is used here as the stable teaching baseline.
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Is it possible for isDirectory() and isFile() both to return false?

Answer:

Yes—if the pathName of the File object does not name an existing file or an existing directory, then both methods return false. However, if the thing named by pathName does exist, then one method or the other returns true (but not both).

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