public class SendSmsDemo extends Thread {
    private static SmsHandler smsHandler;
    private static BlockingQueue<SMS> queue = new LinkedBlockingQueue<SMS>();
    private static SendSmsDemo instance = null;

    private SendSmsDemo() {
    }

    public synchronized static SendSmsDemo getInstance(SmsHandler handler) {
        if (instance == null) {
            System.out.println("new instatnce...");
            instance = new SendSmsDemo();
            instance.setDaemon(true);
            smsHandler = handler;
            instance.start();
        }
        return instance;
    }

    public void add(SMS sms) {
        queue.add(sms);
    }

    @Override
    public void run() {
        while(true){
            SMS sms=new SMS();
            try {
                sms = queue.take();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            smsHandler.sendSMS(sms);
        }
    }
}

        while(true){
            SMS sms=new SMS();
            try {
                sms = queue.take();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            smsHandler.sendSMS(sms);
        }

------解决方案--------------------
不太会了