Example code using System.err instead of System.out

In Tutorials > The Java I/O API > File System Basics > Creating and Reading Directories, section "Listing a File System's Root Directories", the code prints to System.err instead of System.out when it is not printing an error.

Iterable<Path> dirs = FileSystems.getDefault().getRootDirectories();
for (Path name: dirs) {
    System.err.println(name);
}

On the same page, I've noticed that the wrong variable is used in the code in "Creating a Directory":

Path dir = ...;
Files.createDirectory(path); // should be dir

Good find! As a fellow volunteer reporting similar issues I am noting that the mismatched variable and System.err usage you report here dates back to at least 2025 (see https://web.archive.org/web/20250605060428/https://dev.java/learn/java-io/file-system/creating-reading-directories/ ) and is not from or related to the changes I recommended to this tutorial series recently in #210 (comment) which were made by the dev.java team. Thanks!

Thanks to both of you! You guys rock! A fix is on its way.

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Example code using System.err instead of System.out #268

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Example code using System.err instead of System.out #268

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authentictech commented on Aug 4, 2026

willy-b commented on Aug 4, 2026

JosePaumard commented on Aug 5, 2026

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