首先，实例化uicolumn对象以表示列，然后以HtmlOut putText实例的形式为特定列创建标题单元对象。

First, you instantiate a UIColumn object to represent the column, then create a header cell object for the particular column in the form of an HtmlOutputText instance.

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在单元测试中避免使用域对象。

Avoid using domain objects in unit tests.

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所有者链：这是从泄漏根到泄漏单元的对象引用链中的对象集。

Owner chain: This is the set of objects in the chain of object references from the leak root to the leaking unit.

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