(a) Write the signature (visibility, name, parameters, types) of the method(s) required
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1 1. (6 pts) Is the final comprehensive? 1 2. (6 pts) Java has interfaces Comparable and Comparator. As discussed in class, what is the main advantage of Comparator? 3. (6 pts) We can use a comparator in our own code, but often we use our comparators with what useful Java class? 4. (6 pts) What is the full signature of the method that all Comparator objects must have? 5. (6 pts) What is the full signature of the method that all Comparable objects must have? 6. (6 pts) If we wish to sort some class C using Comparable, then the method required by Comparable will be located. 7. (6 pts) Insert estuary question here. 8. (6 pts) Insert estuary question here. 9. (6 pts) Xenon s boss asks zher to write a complex data management system. The boss wants the whole structure of all the data in the system to write to a file every night. Based on class discussion, what should Xenon consider, and why? 10. (6 pts) Strategy pattern does not require the use of an interface, but having an interface greatly improves the usability of the software - why? 11. (6 pts) Java has interfaces Comparable and Comparator. As discussed in class, what is the main advantage of Comparator? 12. (10 pts) Suppose you want to control whether two objects of class X are considered duplicates by a HashSet. (a) Write the signature (visibility, name, parameters, types) of the method(s) required (b) Explain very briefly the circumstances under which they would be called. You will not need more space. 1 Hint: Answer yes. 1
2 13. (6 pts) Name one design pattern discussed in class and briefly describe the problem it addresses. 14. (6 pts) Which of the following are design patterns? flyweight, javadoc, serializable, mvc, comparator, strategy, UML, polymorphism, factory, constructor, inheritance, sessions 15. (6 pts) When would you choose to throw a RuntimeException, versus an Exception? 16. (8 pts) Write a method that throws a LizardException (note: LizardExceptions extend Exception). 17. (8 pts) Write a method that calls the method from the previous question. 18. (18 pts) Name and describe (what is it, who makes it, purpose) three artifacts used in Scrum. 19. (6 pts) What are the two things the Scrum Master does, as discussed in class? 2
3 20. (6 pts) Getters and setters (also called accessors and mutators) are methods that allow indirect access to data members (also called attributes) of a class. Based on our in-class Java exercise for class Cat and SubCat, why is it usually better practice to use such methods rather than directly manipulating the data inside an object? 21. (6 pts) As discussed in class, what is a good way to determine whether you should use inheritance or composition? 22. (6 pts) What is the purpose of the flyweight pattern? 23. (6 pts) Describe very briefly the common implementation features of the flyweight pattern discussed in class. 24. (12 pts) Name three kinds of UML diagram and briefly explain their purpose. Do not write answers below this line. 3
4 25. (28 pts) Read carefully and fill in the blanks. Do not change the existing code. Not this is NOT identical to an example from class, just very similar. Pay attention to interfaces. import java.util.iterator; public class Duple implements Iterable{ static Integer[] data = {1,7; public Iterator iterator(){ private class MyIter implements Iterator{ private int curr; MyIter(){curr = 0; public boolean hasnext(){return true; public Object { Object o = data[curr]; curr = (curr + 1) % data.length; return o; public void { //end MyIter public static void main(string[] args) { //Declare a new Duple and its iterator. //Use the iterator to print the first twenty numbers of the //sequence. You may not need every line. 26. (24 pts) What does this print? Be careful of newlines! 4
5 import java.util.*; class Box { void process(dog d){ System.out.print("box"); d.sit(); void processall(collection<dog> pack){ System.out.print("boxall "); for (Dog d: pack) process(d); class Bag extends Box{ void process(dog d){ System.out.print("bag"); d.sit(); void processall(collection<dog> pack){ System.out.print("bagall "); super.processall(pack); class Dog { void sit(){system.out.print("sit "); class CallsPrint { public static void main(string[] args){ Dog d1 = new Dog(); d1.sit(); Bag bag = new Bag(); bag.process(d1); HashSet<Dog> hs = new HashSet<>(); for (int i = 0; i<3; i++) hs.add(new Dog()); Box box = new Box(); box.processall(hs); bag.processall(hs); 5
6 Make it easier for yourself - read this whole page before you begin. Later instructions might influence early design. All the code on this page must work together to demonstrate concepts from class. This code requires you to write multiple classes - read carefully. 27. (10 pts) Write a class Cat that has String and int attributes. 28. (10 pts) Write a class to use for sorting Cats by their String attributes only. 29. (15 pts) Write a class with a main() function. Inside main(), make a list of Cats and sort them by their String attribute. Then sort a second time, this time using an inline class to sort them by their int attribute. Do not write answers below this line. 6
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