ConcurrentPartialFileLocking_Task.java

    private static void createFileWithPhrase(String filename, String phrase) {
        File file = new File(filename);
        try (RandomAccessFile randomAccessFile = new RandomAccessFile(file, "rw")) {
            randomAccessFile.write(phrase.getBytes()); // Write the string as bytes.
            System.out.println("File " + filename + " created with the phrase: \"" + phrase + "\"");
        } catch (IOException e) {
            System.err.println("Error creating file: " + e.getMessage());
        }
    }

    static class FileRegionTask implements Runnable {
        private final String filename;
        private final long startPosition;
        private final long regionSize;
        private final String threadName;

        public FileRegionTask(String filename, long startPosition, long regionSize, String threadName) {
            this.filename = filename;
            this.startPosition = startPosition;
            this.regionSize = regionSize;
            this.threadName = threadName;
        }