Listing 4 shows a version of the singleton that USES a method instead of an attribute to specify the appropriate class.

清单4显示了使用方法而非属性来指定适当类的单例。

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Listing 6 shows a class that assigns only one of its constructor arguments to a class attribute and then attempts to reference both in another method.

清单6展示了一个类，它只将其中一个constructor参数赋值给一个类属性，并尝试在另一个方法中引用它们。

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The form in Listing 11 has no method or action attribute, which means that when you press the Register button, nothing will happen.

清单11中的表单没有方法或动作属性，这意味着当您单击Register按钮时，什么也不会发生。

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