// 创建路径
Path path = Path.of("/home/user", "docs", "readme.txt");
Path cwd = Path.of(".").toAbsolutePath().normalize();

// 路径信息
System.out.println(path.getFileName());    // readme.txt
System.out.println(path.getParent());      // /home/user/docs
System.out.println(path.getRoot());        // /

// 路径操作
Path resolved = path.resolve("config.xml"); // 拼接
Path relative = cwd.relativize(path);       // 相对路径

// 读写文件
String content = Files.readString(Path.of("input.txt"));
Files.writeString(Path.of("output.txt"), "Hello NIO");

List<String> lines = Files.readAllLines(Path.of("data.csv"));

// 文件操作
Files.createDirectory(Path.of("newDir"));
Files.copy(Path.of("src.txt"), Path.of("dst.txt"),
    StandardCopyOption.REPLACE_EXISTING);
Files.move(Path.of("old.txt"), Path.of("new.txt"));
Files.deleteIfExists(Path.of("temp.txt"));

// 遍历目录
try (Stream<Path> stream = Files.walk(Path.of("."))) {
    stream.filter(Files::isRegularFile)
          .forEach(System.out::println);
}

// FileChannel 高效文件复制
try (FileChannel src = FileChannel.open(Path.of("src.bin"));
     FileChannel dst = FileChannel.open(Path.of("dst.bin"),
         StandardOpenOption.CREATE, StandardOpenOption.WRITE)) {
    src.transferTo(0, src.size(), dst); // 零拷贝
}

// Buffer 读写
ByteBuffer buffer = ByteBuffer.allocate(1024);
buffer.put("Hello".getBytes());
buffer.flip(); // 切换为读模式
while (buffer.hasRemaining()) {
    System.out.print((char) buffer.get());
}