复习:如何描述一个模式 关键要素 Design pattern name, Aliases or Also Known As Problem, Intent or goal Forces, Constraints, Motivation Context, Applicability Solution · Structure Participants Collaboration Implementation Evaluation, Resulting Context, Consequences Related patterns Examples, Known uses复习：如何描述一个模式 • 关键要素 – Design pattern name，Aliases or Also Known As – Problem，Intent or Goal – Forces，Constraints，Motivation – Context， Applicability – Solution • Structure • Participants • Collaboration • Implementation – Evaluation，Resulting Context，Consequences – Related Patterns – Examples，Known uses