清单4中显示了要实现这种功能的必要代码。

Listing 4 shows the essential code required to achieve this.

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文章还显示了这两个例子的所有必要代码，并逐行解释它们。

This article shows all the code necessary for both examples, and it gives line-by-line explanations.

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XP不会假装素材卡是开发人员交付必要代码所需的唯一指示。

XP does not pretend that a story card is all the direction a developer needs to deliver the necessary code.

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