为什么我得到了错误：无法找到符号组件？

Why am I getting error: cannot find symbol for JComponent?

youdao

关于这一点的理由是，如同我们在这篇文章的其余部分将会见到一样，UML 2显著地增强了组件图的符号集。

For that reason, UML 2 dramatically enhances the notation set of the component diagram, as we will see throughout the rest of this article.

youdao

如果组件期望的是有符号整数，就请确保将您的数据先转换成有符号整数再进行检查。

If the component expects signed integers, make sure that you convert your data to signed integers and then check.

youdao