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The Abstract Factory pattern should be used when:
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You are creating a framework for applications that can present multiple documents to the user. Two key abstractions in this framework are the classes Application and Document. Both classes are abstract, and clients have to subclass them to realize their application-specific implementations. To create a drawing application, for example, we define the classes DrawingApplication and DrawingDocument. The Application class is responsible for managing Documents and will create them as required—when the user selects Open or New from a menu. Because the particular Document subclass to instantiate is application-specific, the Application class can't predict the subclass of Document to instantiate — the Application class only knows when a new document should be created, not what kind of Document to create. This creates a design problem: The framework must instantiate classes, but it only knows about abstract classes, which it cannot instantiate. What design pattern would you use to solve this problem? Explain your decision.
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In the Binary Balanceable Tree example discussed in class, which was the factory method?
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The ability of an object reference variable to point
to objects of different types is called:
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Why is it desirable to “program to an interface, not to an implementation”?
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What is wrong with this implementation of a “double-checked” singleton class? (there are 5 errors in this implementation)
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Which singleton variant would you use in each case?
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Match the principles with their key idea
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Which of these are consequences of the strategy pattern?
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Select the design principles that are applied in the Observer Pattern
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