code: public static boolean sleep(Number timeout, TimeUnit timeUnit) {
  		try {
  			timeUnit.sleep(timeout.longValue());
  		} catch (InterruptedException e) {
  			return false;
  		}
  		return true;
  	}
docs: 挂起当前线程
  
  @param timeout 挂起的时长
  @param timeUnit 时长单位
  @return 被中断返回false，否则true