This pattern provides a more granular level of authorization than is typically provided by J2EE role-based authorization, getting down to the level of an individual object within a system.
与J2EE基于角色的授权通常提供的授权相比，此模式提供了更细粒度的授权，可以一直细化到项目内的单个对象的级别。
Design pattern, a summary of development experience, plays an important role in object-oriented programming.
设计模式作为软件开发经验的总结，有助于设计良好的面向对象程序。
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