Java Files.walk examples

The Files.walk API is available in Java 8, it is recommended to use try-with-resources to close the Files.walk stream.

	try (Stream<Path> walk = Files.walk(Paths.get("C:\\projects"))) {
		//...

1. List all files.

	try (Stream<Path> walk = Files.walk(Paths.get("C:\\projects"))) {
		List<String> result = walk.filter(Files::isRegularFile)
				.map(x -> x.toString()).collect(Collectors.toList());
		result.forEach(System.out::println);
	} catch (IOException e) {
		e.printStackTrace();

2. List all folders.

	try (Stream<Path> walk = Files.walk(Paths.get("C:\\projects"))) {
		List<String> result = walk.filter(Files::isDirectory)
				.map(x -> x.toString()).collect(Collectors.toList());
		result.forEach(System.out::println);
	} catch (IOException e) {
		e.printStackTrace();

3. List all files end with .txt

	try (Stream<Path> walk = Files.walk(Paths.get("C:\\projects"))) {
		List<String> result = walk.map(x -> x.toString())
				.filter(f -> f.endsWith(".txt")).collect(Collectors.toList());
		result.forEach(System.out::println);
	} catch (IOException e) {
		e.printStackTrace();

References

1. Java docs – Files.walk