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代写R语言 CSC207 Practice Exam Questions - CS编程代写, 作业代写, R语言代做
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List all of the primitive types. How does the memory model reflect the differences between primitive types and ob- jects? When are two primitive variables equal? When are two objects equal? What are the differences between==and theequalsmethod? Are all non-primitive types subclasses of theObjectclass? What features of class Objectdid we use most frequently in the lectures, besides theequalsmethod?What do we mean by casting, autoboxing, and wrapper class. Compare and contrast these terms.Give four examples of subclasses ofCollectionin Java. Describe a different cir- cumstance for each in which you would require the features of that particular type of collection. For example, how and when would you use anArrayList? How are collections similar to arrays? How are they different? Is it possible to define a non- generic subclass ofCollection? Why or why not?Write your own generic class and also write a second class in which you instantiate the generic one. What does instantiate mean?Finish answering the question from theTicketVendorexample from Week 6.Think of examples of how your project follows each of the SOLID principles. How does following each principle prevent code smells? Which code smell(s) does each principle prevent (if any)?In Week 5, you learned about Exceptions. Write amainmethod that tries to call a different method that can throw an Exception. The method should be located in a different class frommain. Can you get yourmainmethod to:(a) compile but not run to completion.(b) compile and run, even though an exception is thrown.(c) compile and run, but print the stack trace to the screen twice, at different partsof the program. In other words, the two traces should describe different pointsin the code.(d) compile and run, even though an exception is thrown from inside acatchblock.(e) The file compiles but does not run. However, between the moment when the lastexception is thrown and the end of execution, the message This is a message.appears on the screen.We discussed the following design patterns in class: Iterator, Observer, Strategy, MVC, Dependency Injection, and Factory Method. When would you want to use each pattern? Describe a situation where the Iterator pattern would be useful. Do that again for each of the other patterns. Describe an alternative solution to the Observer pattern, the Iterator pattern, and to the Strategy pattern.