常见设计模式

1. command
2. activity object

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3. template method
4. strategy

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5. facade
6. mediator

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7. singleton
8. monostate

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9. null object
10. factory

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11. composite

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12. observer

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13. abstract server
14. adater
15. bridge

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16. proxy
17. stairway to heaven

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18. visitor
19. acyclic visitor
20. decorator
21. extension object

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22. state

　　

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