某系统中的文本显示类（Text View）和图片显示类（Picture View）都继承了组件类（Component），分别显示文本和图片内容，现需要构造带有滚动条或者带有黑色边框，或者既有滚动条又有黑色边框的文本显示控件和图片显示控件，但希望最多只增加3个类。那么采用设计模式（ ）可实现该需求
- A.外观
- B.单体
- C.装饰
- D.模板方法
正确答案及解析
正确答案
解析
装饰（Decorator）模式可以再不修改对象外观和功能的情况下添加或者删除对象功能。它可以使用一种对客户端来说是透明的方法来修改对象的功能，也就是使用初始类的子类实例对初始对象进行授权。装饰模式还为对象动态地添加了额外的重任，这样就在不使用静态继承的情况下，为修改对象功能提供了灵活的选择。在以下情况中，应该使用装饰模式：想要在单个对象中动态并且透明地添加责任，而这样并不会影响其他对象；想要在以后可能要修改的对象中添加责任；当无法通过静态子类化实现扩展时。
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