How Can Java Efficiently Recursively Enumerate Files?

Recursively Enumerating Files with Java

Exploring the options for recursively listing files under a specified directory, we uncover various approaches. While "hacky" implementations exist, the Java framework itself offers robust utilities to streamline this task.

Java 8's Streamlined Approach

Java 8 introduces a convenient stream-based solution:

try (Stream<Path> stream = Files.walk(Paths.get(path))) {
    stream.filter(Files::isRegularFile)
          .forEach(System.out::println);
}

This approach provides an elegant way to traverse files and supports a range of stream operations like filtering, mapping, and limiting.

Files.find: Filtering on File Attributes

Java also provides Files.find, which accepts a bi-predicate to filter files based on attributes:

Files.find(Paths.get(path),
           Integer.MAX_VALUE,
           (filePath, fileAttr) -> fileAttr.isRegularFile())
        .forEach(System.out::println);

While Files.find may offer specific optimization when filtering on attributes, its performance is generally comparable to Files.walk.

Performance Comparison

When evaluating these approaches, we recommend considering the specific performance implications based on your usage scenario. For more detailed insights, refer to the GitHub project in the answer's update, which provides results and a test case.

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