Term
| what's purpose of object design? |
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Definition
| prepare for implementation |
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Term
| what are 4 activities in object design? |
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Definition
1. reuse
2. interface specification
3. object model restructuring
4. object model optimization |
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Term
| what's goal of design pattern? |
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Definition
| to ensure the system model stays simple |
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Term
| what are 3 types of design patterns? |
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Definition
| structural patter, behavioral pattern, creational pattern |
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Term
| usually what does structural pattern do? |
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Definition
1. reduce coupling
2. introduce abstract class
3. encapsulate complex structure |
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Term
| usually what does behavioral pattern do? |
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Definition
1. choice of algorithms
2. characterize complex control flows |
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Term
| usually what does creation pattern do? |
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Definition
1. abstraction of complex instantiation process
2. make system independent from the way its objects are created |
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Term
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Definition
1. connects incompatible components
2. allow access to new system while maintaining existing interface
3. uses inheritance and delegation |
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Term
| what is another name for adapter pattern? |
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Definition
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Term
| what type of pattern is adapter pattern? |
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Definition
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Term
| give an example where adapter pattern might be used |
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Definition
| there is a system, i don't want to rebuild the interface, so i use adapter pattern |
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Term
| describe composite pattern |
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Definition
1. tree structure
2. lets client treat individual objects and composition uniformly |
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Term
| what type of pattern is composite pattern? |
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Definition
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Term
| when is composite pattern useful? |
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Definition
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Term
| describe abstract factory pattern |
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Definition
| create objects that are portable to many platforms |
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Term
| what type of pattern is abstract factory pattern? |
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Definition
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Term
|
Definition
1. can provide multiple implementations under same interface
2. can interface to a component that's incomplete
3. decouple abstraction from implementation so two can vary independently |
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Term
| what type of pattern is bridge pattern? |
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Definition
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Term
| what are similarities of adapter and bridge |
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Definition
| hide details of underlying implementation |
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Term
| what are differences of adapter and bridge? |
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Definition
adapter makes thing work after designed
bridge makes it work before designed |
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Term
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Definition
1. provide unified interface
2. like dispatcher |
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Term
| what kind of pattern is facade pattern? |
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Definition
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Term
| what's an application of bridge pattern? |
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Definition
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Term
| describe strategy pattern |
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Definition
1. different algorithms
2. can add more algorithms later
3. can switch which algorithm to use at run time |
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Term
| what type of pattern is strategy pattern? |
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Definition
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Term
| what's usage of policy in strategy pattern? |
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Definition
| used as helper to know which algo to select |
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Term
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Definition
1. encapsulates control flow
2. |
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Term
| describe observer pattern |
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Definition
1. wanna update some other people
2. want extensible and scalable |
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Term
| what type of pattern is observer pattern? |
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Definition
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Term
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Definition
| 1. provide placeholder for another object to access to it because accessing real object might be too heavy 2. location transparent 3. control access rights |
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Term
| what type of pattern is proxy pattern? |
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Definition
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