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  1. package cc.ptt;
  2.  
  3. public class CountDown {
  4.     public interface OnTickListener {
  5. 		public void onTick(int seconds);
  6. 	}
  7.  
  8. 	private static class NullTickListener implements OnTickListener {
  9. 		@Override
  10. 		public void onTick(int seconds) {
  11. 		}
  12. 	}
  13.  
  14. 	private static final OnTickListener nullListener =
  15. 			new NullTickListener();
  16. 	private OnTickListener tickListener = nullListener;
  17.  
  18. 	public void asyncStart(final int seconds) {
  19. 		// run in some worker thread
  20. 		new Thread(new Runnable() {
  21. 			public void run() {
  22. 				try {
  23. 					count(tickListener, seconds);
  24. 				} catch (InterruptedException e) {
  25. 					e.printStackTrace();
  26. 				}
  27. 			}
  28. 		}).start();
  29. 	}
  30.  
  31. 	public void syncStart(int seconds) {
  32. 		// run in the caller thread
  33. 		try {
  34. 			count(tickListener, seconds);
  35. 		} catch (InterruptedException e) {
  36. 			e.printStackTrace();
  37. 		}
  38. 	}
  39.  
  40. 	private void count(OnTickListener listener, int timeInSecs)
  41. 			throws InterruptedException {
  42. 		if (timeInSecs <= 0) {
  43. 			listener.onTick(0);
  44. 			return;
  45. 		}
  46. 		listener.onTick(timeInSecs);
  47. 		Thread.sleep(1000);
  48. 		count(listener, timeInSecs - 1);
  49. 	}
  50.  
  51. 	public OnTickListener getTickListener() {
  52. 		return tickListener == nullListener? null : tickListener;
  53. 	}
  54. 	public void setTickListener(OnTickListener tickListener) {
  55. 		if (tickListener == null)
  56. 			this.tickListener = nullListener;
  57. 		else
  58. 			this.tickListener = tickListener;
  59. 	}
  60. }
  61.  
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https://ideone.com/edwtgI
language:
Java (HotSpot 12)
created:
13 years ago
visibility:
secret

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