Try It Yourself - SyntaxStudy Editor

HTML / CSS / JS

import java.io.*;
import java.nio.file.*;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.List;
import java.util.stream.Collectors;

public class DirectoryWalkDemo {

public static void main(String[] args) throws IOException {
        // Set up a demo directory tree
        Path root = Path.of("demo-tree");
        Files.createDirectories(root.resolve("src/main"));
        Files.createDirectories(root.resolve("src/test"));
        Files.writeString(root.resolve("src/main/App.java"),     "// App");
        Files.writeString(root.resolve("src/main/Util.java"),    "// Util");
        Files.writeString(root.resolve("src/test/AppTest.java"), "// Test");
        Files.writeString(root.resolve("README.md"),             "# Demo");

// --- Files.walk: all .java files ---
        System.out.println("All .java files:");
        try (var stream = Files.walk(root)) {
            stream.filter(p -> p.toString().endsWith(".java"))
                  .forEach(p -> System.out.println("  " + p));
        }

// --- Files.walk: count files vs directories ---
        try (var stream = Files.walk(root)) {
            long fileCount = stream.filter(Files::isRegularFile).count();
            System.out.println("Regular file count: " + fileCount);
        }

// --- Files.find with attributes ---
        System.out.println("
Files larger than 5 bytes:");
        try (var stream = Files.find(root, 10,
                (path, attrs) -> attrs.isRegularFile() && attrs.size() > 5)) {
            stream.forEach(p -> System.out.println("  " + p));
        }

// --- SimpleFileVisitor: delete tree ---
        Files.walkFileTree(root, new SimpleFileVisitor<>() {
            @Override public FileVisitResult visitFile(Path f, BasicFileAttributes a)
                    throws IOException { Files.delete(f); return FileVisitResult.CONTINUE; }
            @Override public FileVisitResult postVisitDirectory(Path d, IOException e)
                    throws IOException { Files.delete(d); return FileVisitResult.CONTINUE; }
        });
        System.out.println("Tree deleted. Exists: " + Files.exists(root));
    }
}