Casting math operands before assignment

src/main/java/org/wltea/analyzer/help/Sleep.java

@@ -15,13 +15,13 @@ public class Sleep {
 					Thread.sleep(num);
 					return;
 				case SEC:
-					Thread.sleep(num*1000);
+					Thread.sleep(num*1000L);
 					return;
 				case MIN:
-					Thread.sleep(num*60*1000);
+					Thread.sleep(num*60*1000L);
 					return;
 				case HOUR:
-					Thread.sleep(num*60*60*1000);
+					Thread.sleep(num*60*60*1000L);
 					return;
 				default:
                     logger.error("输入类型错误，应为MSEC,SEC,MIN,HOUR之一");