> For the complete documentation index, see [llms.txt](https://cmmobile.gitbook.io/cmmobilebook/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cmmobile.gitbook.io/cmmobilebook/cheng-shi-lian-xi-ti/wu-jian-dao-xiang-lian-xi/stopwatch.md).

# StopWatch

### 題目一

請設計一個名為StopWatch的類別。此類別包括：

* 資料欄位有startTime與endTime，並且外部只能get，不能set。
* 產生StopWatch時，建構式有製造時間manufacturingDate，以目前時間當作參數。
* 名為start()的方法，用來將startTime重新設定為目前時間。
* 名為stop()的方法，用來將endTime設定為目前時間。
* 名為getElapsedTime()的方法，回傳碼表所經過，以毫秒為單位的時間。

產生100,000個隨機數計，並且做排序由小到大。利用StopWatch類別來計算所需的時間和製造時間，並顯示結果。


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