> For the complete documentation index, see [llms.txt](https://ethan-lin.gitbook.io/refactoring/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ethan-lin.gitbook.io/refactoring/xiang-jin-mei-gui/12-task-9.md).

# 任务9：夺取最后的胜利

首先，要恭喜你成功地走到了这一步！我们已经剪除了一些较为简单的分支，剩下的那个分支也在不知不觉中褪去它可怖的面目。有了前面的经验，你甚至可能已经信心十足、跃跃欲试，准备夺取我们重构大业最后的全面胜利了。

相信到这里，我已经不需要告诉你应该干什么了。来吧，带着前面学到的全部知识，尽情地攻克阻挡在我们面前的最后一道障碍吧。

![](/files/-LrtW0kAn0rsyHcIRUTC)

## 你的任务

Java：

```
git checkout task-9-final-victory
./gradlew clean build
```

JavaScript：

```
git checkout task-9-final-victory
npm test
```

1. 消除剩余方法中的`if`条件，把商品相关的行为全部搬移到特定的子类中
2. 要求小步前进，每一步修改之后马上运行所有测试，确保软件行为不变


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