Java NIO の Files クラスでファイル操作を簡潔に書く

import java.io.IOException;

public class NioFileOperations {

    public static void main(String[] args) throws IOException {

        var file = Path.of("sample_nio.txt");
        var content = "1行目: NIO サンプル\n2行目: Files API\n3行目: UTF-8 デフォルト";
        Files.writeString(file, content);

        var text = Files.readString(file);
        System.out.println("読み込み:\n" + text);

        var dir = Path.of("work/output");
        Files.createDirectories(dir);

        var copy = dir.resolve("sample_copy.txt");
        Files.copy(file, copy, StandardCopyOption.REPLACE_EXISTING);

        var moved = dir.resolve("sample_moved.txt");
        Files.move(copy, moved, StandardCopyOption.REPLACE_EXISTING);

        System.out.println("サイズ: " + Files.size(moved) + " bytes");
        var attrs = Files.readAttributes(moved, BasicFileAttributes.class);
        System.out.println("更新日時: " + attrs.lastModifiedTime());

        try (var stream = Files.list(dir)) {
            stream.forEach(p -> System.out.println("  " + p.getFileName()));
        }

        Files.delete(moved);
        Files.delete(dir);
        Files.delete(Path.of("work"));
        Files.delete(file);
    }
}