Java By Comparison

Always Close Resources

class Logbook {

    static final Path LOG_FOLDER = Paths.get("/var/log");
    static final String FILE_FILTER = "*.log";

    List<Path> getLogs() throws IOException {
        List<Path> result = new ArrayList<>();

        DirectoryStream<Path> directoryStream =
                Files.newDirectoryStream(LOG_FOLDER, FILE_FILTER);
        for (Path logFile : directoryStream) {
            result.add(logFile);
        }
        directoryStream.close();

        return result;
    }
}

Programs need system resources, such as disk space, database or network connections, CPU threads, and RAM. These resources are limited, and programs have to share them among each other. If a single program acquires resources without releasing them, it can bring down the whole environment. ...