New functionality can be added to an application by composing existing objects in new ways rather than by defining new subclasses of existing classes.

通过用新的方法组合已有的对象来增加新的功能到应用上，而不是通过用已有的类定义新的子类。

youdao

New functionality can be added to an application by composing existing objects in new ways rather than by defining new subclasses of existing classes.

通过用新的方法组合已有的对象来增加新的功能到应用上，而不是通过用已有的类定义新的子类。

youdao