代写CS116留学生、代做Java编程设计、Java程序调试、代写Notepad++

日期：2018-12-04 10:16

MIDTERM EXAM-Fall 2018

NAME:

DATE:

SIGNATURE:

SIGN AND RETURN THE EXAM ON COMPLETION.

Duration: 120 minutes

This test is CLOSED book CLOSED notes. It is worth 20 points towards

your final grade.

You can use the station computer or laptop to access Notepad++. No other

types of files or opening a Browser are permitted.

At the end zip the source code and compiled files and submit the zipped file

on Blackboard under Submissions => Exams => Midterm. DO NOT USE

RAR!

For Part B, submit your answers in a txt file.

No flash drives, no smart phones allowed (put your phone in your packet).

Partial credit will be given as appropriate

Part A: Programming [15 pts]

You are working on a project to automate the standings of sports teams. Your project consists of a service class

in Team.java and a client class in TeamClient.java.

Team.java

The specifications of Team.java are:

Every Team has a unique String name, an integer number of wins and an integer number of losses

(wins plus losses equals total games).

We need default and non-default constructors, and standard set* and get* methods.

A “winningPercentage“ method to calculate and return the real number winning percentage (divide the

wins by total games and return the real number result). If zero games have been played, return a zero

winning percentage.

? A “toString” method, which returns a formatted String containing all the data ,the winning percentage

members (no special formatting needed), and below phrase depending on the winning percentage:

“Over 500 Team” if winning percentage is greater than .5

“Under 500 Team” if winning percentage is less than .5

“500 Team” if winning percentage equals .5

Place the Team.java in a package called Midterm.Service

TeamClient.java

The purpose of the client is to read the information about the team from the text file and add it to a

data structure. The client will then sort the team information and print it out.

Download the file “TeamClient.java” and text file called “TeamTxt.txt” from the Blackboard,

which has the code to read the information on the wins and losses of the teams from a text file called

“TeamTxt.txt”. The format of the text file is:

TEAM-NAME:NO-OF-WINS:NO-OF-LOSSES

The client is placed in the package Midterm.Client

You will modify the client file in the following way:

o As the client reads in each line from the text file, an object of Class Team is created with the

information on the team (name, wins and losses)

o Import relevant user defined and pre-defined classes.

o The client has a data structure to store the objects. You have the choice to implement this

data structure as an array or Vector or ArrayList.

o After reading the file, and creating and populating the data structure, the client will implement

selection sort to sort the data structure in decreasing order of the teams’ “winningPercentage”.

The first index in your data structure should have the team with the highest

winningPercentage, the second index should have the team with second highest

winningPercentage, and so on.

o Finally, the client should print out all the entries in the data structure in order.

Extra-credit[5 pts]

The text file can have duplicate entries for a team. Two entries are said to be duplicate if the team

names match. When the client encounters a duplicate entry, it should add the wins and losses from the

duplicate entry to the wins and losses information of the team already in the data structure.

You should implement code that will check for and remove duplication before sorting and print out the

entries.

Note, maintain the package structure, as declared in the java files.

Make sure your code compiles and generates the correct results.

You can refer to the attachment “Sample-output.txt”, which has the output when the duplicates have been

removed.

Part B: Theory [5 pts]

Submit your answers for Part B as a text file called “PartB.txt”

Multiple Choice Questions:

1. Which of the following is FALSE about arrays in Java

A. Java array is always an object

B. Length of array can be changed after creation

C. Array’s length attribute provides the size of the array

D. Array can store objects

Answer:

2. Conider the following code snippet. What is the result of compiling and executing this class?

public class MainClass

{

public static void main(String[] args)

{

int[] a = new int[10];

int[] b = new int[100];

a = b;

}

}

A. Compilation error

B. Execution error

C. Compiles but gives an execution error

D. Compiles and executes successfully

Answer:

3. In the following array, what is the value of fees.length?

double[][] fees = {{3.00, 3.50, 4.00, 5.00},

{6.35, 7.35, 8.35, 9.00}};

a. 2

b. 4

c. 8

d. none of the above

Answer:

4. Which search algorithm would be best to use with ordered data?

a) Binary search

b) Sequential search

c) Binary and sequential search have the same performance

d) Cannot use either binary or sequential search

Answer:

5. What is the output of the following code?

enum Barcode{

one, two, three, four, five;

}

public class HashTest{

public static void main(String[] str){

Barcode bar = Barcode.two;

System.out.println(bar);

}

}

a) two

b) Compilation error

c) execution error

d) None of the above

Answer: