如何实现单个实例Java应用程序？

我在主要方法中使用以下方法。这是我所见过的最简单。

private static boolean lockInstance(final String lockFile) {    try {        final File file = new File(lockFile);        final RandomAccessFile randomAccessFile = new RandomAccessFile(file, "rw");        final FileLock fileLock = randomAccessFile.getChannel().tryLock();        if (fileLock != null) { Runtime.getRuntime().addShutdownHook(new Thread() {     public void run() {         try {  fileLock.release();  randomAccessFile.close();  file.delete();         } catch (Exception e) {  log.error("Unable to remove lock file: " + lockFile, e);         }     } }); return true;        }    } catch (Exception e) {        log.error("Unable to create and/or lock file: " + lockFile, e);    }    return false;}