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Final exam 2016 programming methods
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What are 2 concrete disadvantages if concrete class C depends on concrete class D
What are 2 concrete disadvantages if concrete class C depends on concrete class D
- Hinders Maintainebility: If code in D changes, C must be checked (recompiled, tested) as well
- Hinders reuse: If you want to reuse class C you must reuse class D as well
- Hinder verifiablility: C is harder to test, because you must use it together with that particular class D. This may be slow, difficult, expensive and it can be hard.
What kinds of code and documentation must be delivered to implement an ADT
What kinds of code and documentation must be delivered to implement an ADT
Code:
- A data representation
- Implementations of all operations
documentation:
representation invariant: stating under which condition the data representation is valid
Abstraction function: mapping a valid data representation to the corresponding abstract value
Explain what design pattern play a role in the swingworker and what their role is
Explain what design pattern play a role in the swingworker and what their role is
- Template method: some methods hold common code and some methods like doInBackground() and done() serve as hook methods that are overridden.
- Facade: The swingworker provides a simpler interface for the java thread library
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