Java代写 | CS 113 Assignment Working with classes and objects

本次Java代写是创建实体类并从文件读取数据初始化对象

CS 113 Assignment
Part I: In the first part of this assignment, you will create a BaseballPlayer class which will represent a baseball player on
a team.
1. Create a new directory called baseball. In that directory, create a BaseballPlayer class with the following instance
variables:
int number;
String firstName;
String lastName;
String position;
char battingArm;
char throwingArm;
int weight;
int height; // height in inches
String birthDate; // in format mm/dd/yyyy
String birth1;
String birth2;
Be sure that all the variables have private access modifiers.
2. Create a constructor for the BaseballPlayer object which takes parameters corresponding to each of the above instance
fields.
3. Create set and get methods for each of the above instance fields.
4. Create a method called getFullName which returns a String which consists of the firstName followed by the
lastName, with a space between.
5. Create a method called getHanded which returns a String which consists of the battingArm, followed by a slash,
followed the throwingArm, like this: B/R (this means both hands to hit (switch-hitter) and right hand to throw)
6. Create a method called getBirthplace which returns a String which consists of the contents of the String birth1,
followed by a comma, followed by a space, followed by the contents of the String birth2
7. Create a method called getHeightString which returns a String which shows the height in feet and inches, like this:
6’2″ . The height field is in inches. Hint: to insert a quote mark inside a string, escape it with a backslash.
8. Create a method called getBirthYear which returns an int that is equal to the year listed in the birthdate string (yyyy).
9. Create a method called getAge which returns an int that is the difference between 2019 and the birthYear (hint: call
getBirthYear)
10. Create a method called toString which returns a String consisting of the number, the full name (use the getFullName
method), the position, the batting/throwing arm (use the getHanded method), the height (use the getHeightString
method), the weight, the age, and the birthplace (use getBirthplace method). Format your results so they look like this:
5 Nick Williams RF L/L 6’3″ 195Lbs 26yrs Galveston, Texas
11. To debug your BaseballPlayer.java file, I recommend that you write a small client class which tests each of your
methods to ensure that they work as designed.
Part 2: In this part of the assignment, you will write a client a program to use and manipulate your BaseballPlayer class
1. Download the file phillies2019.txt into the same directory as your BaseballPlayer.java file. This .txt file contains a
list of records containing the Spring 2019 roster for the Philadelphia Phillies, the local baseball team. There are
exactly 29 lines in the file; the first line is a header showing the fields in each record, and the rest of the lines are the
28 players on the Spring 2019 roster.
The first two lines of phillies2019.txt look like this:
Number,Firstname,lastname,Position,Bats,Throws,wt(lbs),height(in),birthdate,birth1,birth2
23,Aaron,Altherr,RF,R,R,223,77,1/14/1991,Landstuhl,Germany
The fields in each record are comma delimited.
2. Create a new client class with a filename BaseballRoster.java which contains a main method to run the program. The
BaseballRoster program should do the following:
(1) Create an array of BaseballPlayer objects to hold all the players in the roster.
(2) Open the phillies2019.txt file and read in each line, using a Scanner (note that you will want to skip the first line).
Use a try-catch block around the code that opens the file; if a FileNotFound Exception is caught, your code should
issue a sensible error message and exit (call System.exit(-1)).
(3) Within each line, use the “split” method that we learned in class to break the line into its comma-separated
components, and then pass each component (after converting it to the proper type, if necessary), to the
BaseballPlayer constructor and put the new object in the array of baseball players. Take careful note of the type of
each parameter in the constructor, and be sure to pass that field as that type, as the split method turns everything
into separate String values. For example, for the number field, it expects an int, and for the battingArm field, it
expects a parameter of the char type. You can use the Integer.parseInt method to convert a String to an int type; to
convert a String to a char, you may simply pass it to the charAt method (e.g. values[4].charAt(0)).
(4) Once the array is created, use a loop (either a regular for loop or an enhanced for loop) to print out a roster of all
the players (see the example printout).
(5) Create a search function in the form of a loop which prompts the user for whether they wish to search for player
number, player name (either last or first), or player birthplace (state or, if not US, country). Your function should
produce a listing of all players that meet those criteria. If there are no matches, issue an appropriate error message
and ask again. Continue to loop until the user presses 0 (see the example printout).
Challenge: Create another version of BaseballRoster (call it BaseballRoster2.java) which uses an ArrayList, rather than an
array, to store the BaseballPlayer objects.
How to hand in your assignment:
Upload your BaseballPlayer.java, BaseballRoster.java, and, if you chose to do the challenge problem, the
BaseballRoster.java files, along with your reflection. The “official” due date for this assignment is May 1, but, since this
is part of your final exam grade, you may have an “automatic extension” to 11:59 pm on May 7 if needed.
The Reflection must include:
a. Name and email
b. What was/were the most difficult part(s) of this assignment, if anything?
c. What did you like about this assignment, if anything?
d. What did you particularly dislike about this assignment, if anything?
e. How much time, approximately, did you spend coding on this assignment?
f. Any other comments about the assignment?
I hope you enjoy this assignment! Thank you for being such a great class!
Example runs:
java BaseballRoster
Player Roster:
23 Aaron Altherr RF R/R 6’5″ 223Lbs 28yrs Landstuhl, Germany
52 Jose Alvarez P L/L 5’11” 190Lbs 30yrs Barcelona, Venezuela
64 Victor Arano P R/R 6’2″ 220Lbs 24yrs Cosamaloapan, Mexico
49 Jake Arrieta P R/R 6’4″ 225Lbs 33yrs Farmington, Missouri
58 Seranthony Dominguez P R/R 6’1″ 185Lbs 25yrs Esperanza, Dominican Republic
56 Zach Eflin P R/R 6’6″ 211Lbs 25yrs Orlando, Florida
48 Jerad Eickhoff P R/R 6’4″ 244Lbs 29yrs Evansville, Indiana
7 Maikel Franco 3B R/R 6’1″ 229Lbs 27yrs Azua, Dominican Republic
9 Phil Gosselin 2B R/R 6’1″ 200Lbs 31yrs West Chester, Pennsylvania
3 Bryce Harper RF L/R 6’3″ 220Lbs 27yrs Las Vegas, Nevada
16 Cesar Hernandez 2B B/R 5’10” 167Lbs 29yrs Valencia, Venezuela
37 Odubel Herrera CF L/R 5’11” 206Lbs 28yrs Zulia, Venezuela
17 Rhys Hoskins LF R/R 6’4″ 240Lbs 26yrs Sacramento, California
96 Tommy Hunter P R/R 6’3″ 250Lbs 33yrs Indianapolis, Indiana
4 Scott Kingery SS R/R 5’10” 180Lbs 25yrs Phoenix, Arizona
15 Andrew Knapp C B/R 6’1″ 204Lbs 28yrs Roseville, California
22 Andrew McCutchen RF R/R 5’11” 195Lbs 33yrs Fort Meade, Florida
46 Adam Morgan P L/L 6’1″ 37Lbs 29yrs Tampa, Florida
50 Hector Neris P R/R 6’2″ 227Lbs 30yrs Villa Altagracia, Dominican Republic
93 Pat Neshek P B/R 6’3″ 221Lbs 39yrs Madison, Wisconsin
12 Juan Nicasio P R/R 6’4″ 252Lbs 33yrs San Francisco de Macoris, Dominican Republic
27 Aaron Nola P R/R 6’2″ 200Lbs 26yrs Baton Rouge, Louisiana
24 Roman Quinn CF B/R 5’10” 170Lbs 26yrs Port St. Joe, Florida
10 J.T. Realmuto C R/R 5’10” 213Lbs 28yrs Del City, Oklahoma
30 David Robertson P R/R 5’11” 195Lbs 34yrs Birmingham, Alabama
2 Jean Segura SS R/R 5’10” 220Lbs 29yrs San Juan, Dominican Republic
21 Vince Velasquez P R/R 6’3″ 203Lbs 27yrs Montclair, California
5 Nick Williams RF L/L 6’3″ 195Lbs 26yrs Galveston, Texas
Enter 1 to search on player number, 2 to search on name,
3 to search on player birthplace, or 0 to quit: 1
Enter the number to search: 37
37 Odubel Herrera CF L/R 5’11” 206Lbs 28yrs Zulia, Venezuela
Enter 1 to search on player number, 2 to search on name,
3 to search on player birthplace, or 0 to quit: 1
Enter the number to search: 52
52 Jose Alvarez P L/L 5’11” 190Lbs 30yrs Barcelona, Venezuela
Enter 1 to search on player number, 2 to search on name,
3 to search on player birthplace, or 0 to quit: 1
Enter the number to search: 5
5 Nick Williams RF L/L 6’3″ 195Lbs 26yrs Galveston, Texas
Enter 1 to search on player number, 2 to search on name,
3 to search on player birthplace, or 0 to quit: 1
Enter the number to search: 99
Sorry, no matches!
Enter 1 to search on player number, 2 to search on name,
3 to search on player birthplace, or 0 to quit: 2
Enter the name to search: Vince
21 Vince Velasquez P R/R 6’3″ 203Lbs 27yrs Montclair, California
Enter 1 to search on player number, 2 to search on name,
3 to search on player birthplace, or 0 to quit: 2
Enter the name to search: Maria


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