Creating a complete look and feel has required developers to subclass either the Metal look and feel's 39 classes or the Basic look and feel's 60 classes.

为了创建完整的外观，开发人员需要继承Metal外观的39个类，或者继承Basic外观的60个类。

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Creating a complete look and feel has required developers to subclass either the Metal look and feel's 39 classes or the Basic look and feel's 60 classes.

为了创建完整的外观，开发人员需要继承Metal外观的39个类，或者继承Basic外观的60个类。

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