CSE 480 Midterm: CSE 480 MSU Exam 2018 version a Exam

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turquoisegnu128

31 Jan 2019

School

MSU

Department

Computer Science and Engineering

Course

CSE 480

Professor

All

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Answer the questions in the spaces provided on the page. If you run out of room for an answer, continue on the back of that page. 50 points (a) (30 points) which dependencies are obeyed in the relation below? (select all true dependences) Fill in the additional dependent rows as needed (you may not need all available space). name josh zizhen josh josh id. After the statement is completed by the associated connection, write which connections are holding each type of lock in the table. If no connection holds a type of lock, leave it blank. A connection can only hold one lock at a time. If an action can"t be granted the necessary locks, cross out that action and proceed as if that action wasn"t in the schedule (don"t perform a rollback). You are given a relation with 8 attributes {a,b,c,d,e,f,g,h} and the following func- tional dependencies:

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3. Write a short phrase or sentence from page 1 that demonstrates imagery. Explain HOW it demonstrates imagery being specific as to which sense.

Excerpt From The Soloist by Steve Lopez

Preface

1 I'm on foot in downtown Los Angeles, hustling back to the office with another. deadline looming. That's when I see him. He's dressed in rags on a busy downtown street comer, playing Beethoven on a battered violin that looks like it's been pulled from a dumpster.

2 "That sounded pretty good, " 1 say when he finishes.

3 He jumps back three steps, eyeing me with suspicion. 1 see the name Stevie Wander carved into the face of the violin, along with felt-pen doodles.

4 "Oh, thank you very much," he says, obviously flattered. "Are you serious?"

5 "I'm not a musician," I answer. "But yes. It sounded good to me."

6 He is black, just beyond fifty, with butterscotch eyes that warm to the compliment. He is standing next to a shopping cart heaped over with all his belongings, and yet despite grubby, soiled clothing, there's a rumpled elegance about him. He speaks with a slight regional accent I can't place. Maybe he's from the Midwest or up near the Great? Lakes, and he seems to have been told to always stand up straight, enunciate, carry, himself with pride and respect others.

7 'I'm trying to get back in shape," he says. "But I'm going to get back in there, playing better. I just need to keep practicing."

8 "So you like Stevie Wonder?" 1 ask.

9 "Oh, yes, certainly, 'You Are the Sunshine of My Life.' 'My Cherie Amour.' I guess I shouldn't have written his name on my violin, though."

10 I write a column for the Los Angeles Times. The job is a little like fishing. You go out and drop a line, cast a net. I'm figuring this vagrant violinist is a column. Has to be.

11 "I'm in a hurry at the moment," I tell him, "but I'd like to come back and hear you play again."

12 'Oh, all right," he says, smiling appreciatively but with trepidation. He looks like....

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8. Write a class called WordSet representing a set of String objects which can contain an arbitrary number of strings, limited only by the memory available to the Java Virtual Machine. A set is a collection of elements, however, unlike a list, a set cannot contain duplicate elements. Therefore, as its name implies, a WordSet object cannot contain duplicate Strings that is, if one attempts to da String to a Wordset, and the wordset already contains an element which is equal to this string, the attempt will fail and the state of the Wordset will not change. All String comparisons performed in the methods defined in the Wordset class are done in a Case SENSITIVE manner. Note that in the method descriptions below, the phrase "this Wordset" means "the Wordset on which the method in question is called." Your Wordset class MUST provide the following INSTANCE methods • A constructor, which takes no parameters and initializes the new Wordset ohject so that it contains no elements • A method called add(), which takes as its only parameter a string and returns a value of type boolean. If this Wordset already contains a string which is equal to the parameter string, or the parameter String is null, then the state of this Wordset does not change and the method return false; otherwise, the parameter String is added to this Wordset. and the method returns true. • A method called remove().which takes as its only parameter a string and returns a value of type boolean. If this wordSet contains a string which is equal to the parameter String this string is removed from the WordSet and the method returns true. On the other hand, if the string parameter is null or this Wordset does not contain a string which is equal to the parameter string, then the state of this wordset does not change, and the method return false. • A method called get.size(), which takes no parameters and returns the number of strings currently stored in this Wordset. This method MUST NOT change the state of this Wordset. • A method called isMember(). which takes as its only parameter a string and retumsa value of type boolean which is true if this wordset contains the parameter String false otherwise. If the parameter String is null, this method also return false. This method MUST NOT change the state of this wordset. • A method called computebirrerence().which takes as its only parameter a Wordset and returns a new Wordset representing the difference between this wordset and the parameter Wordset: in other words, the WordSet returned by this method contains all the strings that are in this wordset, but not in the parameter Wordset. If the parameter Wordset contains all the elements of this WordSet or this WordSet contains no elements, then this method returns a new Wordset containing no elements. Finally, if the parameter Wordset is null or contains ne strings, then this method returns a new wordset which contains all the elements of this wordset. This method MUST NOT change the state of this wordset or the parameter Wordset. • A method called tostring , which takes the parameters and turns a string which is the textual representation of this wordset. This textual representation consists of the concatena tion of the following clements - The String - The text representation of each clement in the WordSet; cach pair of adjacent clements is separated by the String", but this String MUST NOT appear before the first clement or after the last element - The String") The order in which the elements of this Wordset appear in the textual representation generated by the tostring() method does not matter. If the WordSet contains to Brings, then the textual representation returned by this method is ". Note that you MUST respect proper encapsulation practices that is, the attributes and methods of your class MUST be declared using the proper visibility modifier NINT Um an array list (of string) to keep track of the string stored in a wordt ob joot Is there a method defined in the Array loist class which determines whether in clementis already wored in an array ist, and which will do a case-sensitive comparison when liked on an Arraylint of strings? See the pages 24-26 of this examination for information about potentially useful methods defined by the ArrayList class WRITE YOUR Wordset CLASS IN THE SPACE BELOW:

CSE 480 Midterm: CSE 480 MSU Exam 2018 version a Exam

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