Question

Java program

Program: Grade Stats In this program you will create a utility to calculate and display various statistics about the grades of a class. In particular, you will read a CSV file (comma separated value) that stores the grades for a class, and then print out various statistics, either for the whole class, individual assignments, or individual students Things you will learn Robustly parsing simple text files Defining your own objects and using them in a program Handling multiple input commands Specification When your program starts, it should print the program title and your name, then load the file given as a command line argument similar to the sorting assignment). If no file is given, or if file does not the exist, the program should print a usage message and exit. After loading the input file, the program should go into "command" mode, which allows the user to type in various commands and get results from the system. This is similar to the calculator assignment. You should show some kind of a prompt, such as to the user, and wait for commands. The commands that your system must process are as follows: 1. exit Causes the program to exit. 2. help Causes the program to print a list of commands accepted by the system. This same message should be printed if the user types an unrecognized command. The program must not crash in this case. 3. roll Prints out a list of students from the class (first and last name along with total points, and final grades (A, B, C, D, F) for each student. These should be properly aligned in columns, so that the grades line up above one another, and the student first name and student last name are left aligned. 4. search [partial name]

Answer 1

I HAVE DONE THIS JOB IN ECLIPSE, HERE IS THE CODE:

//ProgramSeven.java

import java.util.*;
import java.io.*;

public class ProgramSeven
{
public static List<student> students = new ArrayList<student>();
public static HashMap<String, Double> assignments = new HashMap<String, Double>();
public static Scanner keyboard = new Scanner(System.in);

public static String course = "", section = "";
public static double total;

public static void main(String[] args) throws IOException
{
System.out.println("--------------------------------"+"\n"+
"| Grade Stats, by Tanner Heape |"+"\n"+
"--------------------------------");
// User input
String file = "";

// Checks for initial input
if (args.length > 0)
{
file = args[0];
}

// Varifies file
while(true)
{
File fileI = new File("./"+file);
if(fileI.exists() && fileI.isFile())
{
toList(fileI);
break;
}
System.out.print("Enter the file name: ");
file = keyboard.nextLine();
}

while(true)
{
System.out.print("\n> ");

// splits user input into readable sections (ArrayList)
List<String> input = new ArrayList<String>(Arrays.asList(keyboard.nextLine().split(" ")));

if(input.get(0).equalsIgnoreCase("exit")) // runs quit
{
System.exit(0);
}
else if(input.get(0).equalsIgnoreCase("help")) // runs help
{
System.out.println(" Accepted commands:\n" +
" exit\n" +
" help\n" +
" students\n" +
" search [partial name]\n" +
" assignments\n" +
" report\n" +
" student [student name]\n" +
" assignment [assignment name]");
}
else if(input.get(0).equalsIgnoreCase("students")) // runs students
{
System.out.println(" Student Grades for " + course + ", " + section + "\n" +
" Total points possible: " + total + "\n");

System.out.printf(" %-10s %-10s %6s %5s%n ---------- --------- ------ -----%n", "First Name", "Last Name", "Points", "Grade");

for(student st : students)
{
System.out.printf(" %-10s %-10s %6.0f %s%n", st.getFirstName(), st.getLastName(), st.getPoints(), st.getLetterGrade());
}
}
else if(input.get(0).equalsIgnoreCase("search")) // runs search [input]
{
if(input.size() > 1)
{
String subString = input.get(1);

System.out.printf(" %-10s %-10s %6s %5s%n ---------- --------- ------ -----%n", "First Name", "Last Name", "Points", "Grade");

for(student st : students)
{
if(st.getFirstName().toLowerCase().contains(subString.toLowerCase()) || st.getLastName().toLowerCase().contains(subString.toLowerCase()))
{
System.out.printf(" %-10s %-10s %6.0f %s%n", st.getFirstName(), st.getLastName(), st.getPoints(), st.getLetterGrade());
}
}
}
else
{
System.out.println(" Invalid input");
}
}
else if(input.get(0).equalsIgnoreCase("assignments")) // runs assignments
{
System.out.println(" Assignments for " + course + ", " + section + "\n");

System.out.printf(" %-12s %6s%n %-12s %6s%n", "Assignment", "Points", "----------", "------");
for(String key : assignments.keySet())
{
System.out.printf(" %-12s %6.0f%n", key, assignments.get(key));
}
}
else if(input.get(0).equalsIgnoreCase("student")) // runs student [first] [last]
{
if(input.size() > 2)
{
String first = input.get(1);
String last = input.get(2);

for(student st : students)
{
if(st.getFirstName().equalsIgnoreCase(first) && st.getLastName().equalsIgnoreCase(last))
{
System.out.println(" Grades for " + st.getFirstName() + " " + st.getLastName() + "\n");
System.out.printf(" %-12s %6s %8s%n %-12s %6s %8s%n", "Assignment", "Points", "Possible", "----------", "------", "--------");

for(String key : assignments.keySet())
{
System.out.printf(" %-12s %6.0f %8.0f%n", key, st.getAssignment(key), assignments.get(key));
}
System.out.printf(" %-12s %6.0f %8.0f%n%n", "total", st.getNumberGrade(), total);
System.out.println(" Final Grade: " + st.getLetterGrade());
}
}
}
else
{
System.out.println(" Invalid input");
}
}
else if(input.get(0).equalsIgnoreCase("assignment")) // runs assignment [assignment name]
{
if(input.size() > 1)
{
String search = "";
for(int i = 1; i < input.size(); i++)
{
if(i == input.size()-1)
{
search += input.get(i);
}
else
{
search += input.get(i) + " ";
}
}

if(assignments.containsKey(search))
{
System.out.println(" " + search + ": " + assignments.get(search) + " points\n grade breakdown");

int a = 0, b = 0, c = 0, d = 0, f = 0;
double points = assignments.get(search);
for(student st : students)
{
if(st.getAssignment(search)/points >= 0.90)
{
a++;
}
else if(st.getAssignment(search)/points >= 0.80)
{
b++;
}
else if(st.getAssignment(search)/points >= 0.70)
{
c++;
}
else if(st.getAssignment(search)/points >= 0.60)
{
d++;
}
else if(st.getAssignment(search)/points < 0.60)
{
f++;
}
}
System.out.println("\n A: " + a);
System.out.println(" B: " + b);
System.out.println(" C: " + c);
System.out.println(" D: " + d);
System.out.println(" F: " + f);

}
else
{
System.out.println(" Invalid input");
}
}
else
{
System.out.println(" Invalid input");
}
}
else if(input.get(0).equalsIgnoreCase("report")) // runs report
{
System.out.println(" Grade breakdown for " + course + ", " + section);

int a = 0, b = 0, c = 0, d = 0, f = 0;
double high = 0, low = 100, average = 0, i = 0;
for(student st : students)
{
if(st.getLetterGrade().equals("A"))
{
a++;
}
else if(st.getLetterGrade().equals("B"))
{
b++;
}
else if(st.getLetterGrade().equals("C"))
{
c++;
}
else if(st.getLetterGrade().equals("D"))
{
d++;
}
else if(st.getLetterGrade().equals("F"))
{
f++;
}

if(st.getNumberGrade() > high)
{
high = st.getNumberGrade();
}
if(st.getNumberGrade() < low)
{
low = st.getNumberGrade();
}
average += st.getNumberGrade();
i++;
}
average /= i;

System.out.println("\n Low: " + low + "%\n High: " + high + "%\n Avg: " + average + "%\n");
System.out.println(" A: " + a);
System.out.println(" B: " + b);
System.out.println(" C: " + c);
System.out.println(" D: " + d);
System.out.println(" F: " + f);
}
}
}

// converts .txt file to values
public static void toList(File fileI) throws IOException
{
// Scanner for reading the file
Scanner textI = new Scanner(fileI);
boolean setup = true;
String[] titles = new String[10];

// Loop to read each textI line
while(textI.hasNext())
{
String[] ln = textI.nextLine().split(",");

if(setup)
{
String[] ln2 = textI.nextLine().split(",");

course = ln[0];
section = ln[1];

for(int i = 2; i < ln2.length; i++)
{
titles[i] = ln[i];
assignments.put(titles[i], Double.parseDouble(ln2[i]));
}

for(String key : assignments.keySet())
{
total += assignments.get(key);
}

setup = false;
}
else
{
HashMap<String, Double> temp = new HashMap<String, Double>();

for(int i = 2; i <= ln.length - 1; i++)
{
temp.put(titles[i], Double.parseDouble(ln[i]));
}

students.add(new student(ln[0], ln[1], temp, total));
}
}
}
}

//student.java

import java.util.*;

// class for object student
public class student
{
// student's variables
private String firstName, lastName, letterGrade;
private double numberGrade, points;
private HashMap<String, Double> assignments = new HashMap<String, Double>();
  
// constructor
public student(String firstName, String lastName, HashMap<String, Double> assignments, double total)
{
this.firstName = firstName;
this.lastName = lastName;
  
this.assignments = assignments;

for(String key : this.assignments.keySet())
{
this.points += this.assignments.get(key);
}

this.numberGrade = 100*(this.points/total);

if(numberGrade >= 90.0)
{
this.letterGrade = "A";
}
else if(numberGrade >= 80.0)
{
this.letterGrade = "B";
}
else if(numberGrade >= 70.0)
{
this.letterGrade = "C";
}
else if(numberGrade >= 60)
{
this.letterGrade = "D";
}
else
{
this.letterGrade = "F";
}
}
  
// getter/setter for firstName
public void setFirstName(String firstName)
{
this.firstName = firstName;
}
public String getFirstName()
{
return this.firstName;
}

// getter/setter for lastName
public void setLastName(String lastName)
{
this.lastName = lastName;
}
public String getLastName()
{
return this.lastName;
}

// getter/setter for assignments
public void setAssignment(String assignment, double score)
{
assignments.put(assignment, score);
}
public Double getAssignment(String assignment)
{
return this.assignments.get(assignment);
}

// getter for numberGrade
public double getNumberGrade()
{
return this.numberGrade;
}

// getter for letterGrade
public String getLetterGrade()
{
return this.letterGrade;
}

public double getPoints()
{
return this.points;
}
}

//Philosophy.txt
Philosophy 101,Section 1,red essay,test 1,green leaf,test 2,presentation
firstName,lastName,5,20,5,20,50
Aristotle,Ofathens,4,18,3,15,40
Euclid,Elements,3,15,2,10,35
Immanuel,Kant,4,18,4,20,48
Ben,Franklin,5,20,4,19,49
Khalil,Gibran,4,18,3,18,47
Noam,Chomsky,5,19,1,18,49
Garrison,Keeler,3,18,4,16,41
Amy,Schumer,2,11,3,14,39
Hamurabi,Lawgiver,5,19,4,20,50
Fred,Flintstone,2,15,3,14,42

output:

M ProgramSeven.java D student.java- Philosophy.txt 1 //ProgramSeven.java 2 import java.util.*; 5 import java.io.*; 6 7 public class ProgramSeven public static List« student> students new ArrayList<student>( nuhlic static HashMan<String. Douhle assianmentsnew HashMa 10 EL Problems @Javadoc 다 Declaration - Console X <terminated ProgramSeven [Java Application] C:AProgram FilesJava\java bin\javaw.exe (Apr 1 | Grade Stats, by Tanner Heape | Enter the file name: Philosophy.txt > help Accepted commands: exit help students search [partial name] assignments report student [student name] assignment [assignment name] » students Student Grades for Philosophy 101, Section 1 Total points possible: 100.0 First Name Last Name Points Grade Aristotle Ofathens Euclid Immanuel Kant Ben Khalil Noam Garrison Keeler Elements 65 94 Franklin Gibran Chomsky 90 92 A 82 69 98 Schumer Hamurabi Lawgiver Fred Flintstone > assignments Assignments for Philosophy 101, Section 1 Assignment Points presentation red essaV test 2 test 1 green leaf 20