I need help with a programming assignment

The part that i need to add the exception are in bold.import java.util.ArrayList;import java.util.Scanner;import java.io.*;public class Main {static ArrayList<String> name = new ArrayList<String>();static ArrayList<String> id = new ArrayList<String>();static ArrayList<String> state_of_employee = new ArrayList<String>();static ArrayList<String> hourly_worked = new ArrayList<String>();static ArrayList<String> state_of_student_employee = new ArrayList<String>();static ArrayList<String> pay_rate = new ArrayList<String>();static Scanner in = new Scanner(System.in);private static Scanner inp;static StudentEmployee[] Obb = new StudentEmployee[50]; public static void main(String[] args) { inp = new Scanner(System.in); file_Operation(); char choice; do{ System.out.print("===================Menu=================");  System.out.print("\nEnter:\n"+" S to Show.\n"+" A to Add.\n"+" R to Remove.\n"   + " N to Sorted-by-name.\n"+ " T to Sorted-by-rate.\n"+" W to Student-isWorkStudy\n"   + " H to Show-highest.\n"+" L to Show-lowest.\n"+" C to Change-rate id/name xxx\n"   + " B to Rate x between y (bonus).\n"+" E to Exit.\n"   + "Enter your choice : ");    choice = inp.next().charAt(0);  switch(choice){ case 'S' : Show(); break; case 'A' : Add(); break; case 'R' : Remove(); break; case 'W' : StudentIsWorkStudy();break; case 'N' : SortByName(); break; case 'T' : SortByRate(); break; case 'H' : ShowHighest(); break; case 'L' : ShowLowest(); break; case 'C' : ChangeRate(); break; case 'B' : Rate(); break; case 'E' : break;  default : System.out.println("Error, Enter a valid key with capital letter"); break; }   }while(choice != 'E'); System.out.println("================================================");  System.out.print("Thank you");}public static void file_Operation(){ String[] words = null; FileReader fr = null; BufferedReader br = null; String line = null ; try{ fr = new FileReader("semployees.csv"); br = new BufferedReader(fr); line = (String)br.readLine(); while(line!=null){ words = line.split(","); name.add(words[0]); id.add(words[1]); state_of_employee.add(words[2]); hourly_worked.add(words[3]); state_of_student_employee.add(words[4]); pay_rate.add(words[5]); line = (String)br.readLine(); } br.close(); fr.close(); }catch(Exception ex){ System.out.println(ex); }}public static void Show(){ System.out.println("================================================"); for ( int i = 0 ; i < name.size(); ++ i ) { System.out.println(  "name: "+ name.get(i) + "\nid: "+id.get(i)  +"\nstate of employee: "+ state_of_employee.get(i) + "\nHourly Worked: "+hourly_worked.get(i)  +"\nstate of student employee: "+ state_of_student_employee.get(i) + "\nPay Rate: "+pay_rate.get(i)  ); System.out.println("================================================"); }}public static void Add(){  int n; System.out.print("Enter the number of person you want add : "); n = inp.nextInt(); for(int i=0 ; i<n ; i++){ System.out.print((i+1)+"-Enter Name: "); name.add((String)in.nextLine()); System.out.print((i+1)+"-Enter ID: "); id.add((String)in.nextLine()); in = new Scanner(System.in); System.out.print((i+1)+"-Enter state of employee: "); state_of_employee.add((String)in.nextLine()); System.out.print((i+1)+"-Hourly Worked: "); hourly_worked.add((String)in.nextLine()); System.out.print((i+1)+"-state of student employee: "); state_of_student_employee.add((String)in.nextLine()); System.out.print((i+1)+"-Pay Rate: "); pay_rate.add((String)in.nextLine()); System.out.println("================================================"); } }public static void Remove(){ int nn; String empid; int index; System.out.print("Enter how many Employees you want ot remove: "); nn = inp.nextInt(); for(int i=0 ; i<nn ; i++){  System.out.print((i+1)+"-Enter ID of Employee to remove: ");  empid = in.nextLine();    index = id.indexOf(empid);   name.remove(index);  id.remove(index);  hourly_worked.remove(index);  state_of_student_employee.remove(index);  state_of_employee.remove(index);  pay_rate.remove(index);  System.out.println("Deleted"); }} public static void Rate(){    int x=0;    int y=0;    System.out.println("================================================");  System.out.println("Show the student employees that with the hourly rate between x and y");  System.out.println("Note, Should x<y ");  System.out.print("Enter x : ");  in = new Scanner(System.in);  x = in.nextInt();   System.out.print("Enter y : ");  in = new Scanner(System.in);  y = in.nextInt();     System.out.println("===Employees's rate between =="+x+" and "+y+"=========");  for ( int i = 0 ; i < name.size(); ++ i ){       if(Integer.parseInt(hourly_worked.get(i)) >= x && Integer.parseInt(hourly_worked.get(i)) <= y){  System.out.println("name: "+ name.get(i));    }       }   System.out.println("================================================");       }  public static void ShowHighest(){   int max = Integer.parseInt(hourly_worked.get(0));  int IndexHigh=0;    for ( int i = 0 ; i < name.size(); ++ i ){    if(Integer.parseInt(hourly_worked.get(i)) > max){     max = Integer.parseInt(hourly_worked.get(i));  IndexHigh = i;  }     }  System.out.println("================================================");  System.out.println("The student employee with highest hourly rate is: "+ name.get(IndexHigh));      } public static void ShowLowest (){  int min = Integer.parseInt(hourly_worked.get(0)); int IndexLow=0;   for( int i = 0 ; i < name.size(); ++ i ){   if(Integer.parseInt(hourly_worked.get(i)) < min){    min = Integer.parseInt(hourly_worked.get(i)); IndexLow = i;  }     } System.out.println("================================================"); System.out.println("The student employee with lowest hourly rate is: "+ name.get(IndexLow));    } public static void StudentIsWorkStudy(){ System.out.println("All the students that are eligible for work study status");  for ( int i = 0 ; i < name.size(); ++ i ){     if(Boolean.parseBoolean(state_of_student_employee.get(i))){ System.out.println("Name : "+name.get(i));    }  }     }  public static void ChangeRate(){ int idd=0; System.out.println("================================================"); System.out.print("Enter the id of the Employee that's you want to change here rate: "); in = new Scanner(System.in); idd = in.nextInt(); int i=0; while(idd != Integer.parseInt(id.get(i))){      i++; }     double newPayrate; System.out.print("Enter the new rate : ");   in = new Scanner(System.in); newPayrate = in.nextDouble();   pay_rate.set(i, Double.toString(newPayrate)); System.out.println("Changed"); } public static void SortByName(){  String temp;  String names[] = new String[name.size()];  for(int i = 0; i < name.size(); i++){   names[i] = name.get(i);  }  for (int i = 0; i < name.size(); i++) {   for (int j = i + 1; j < name.size(); j++)   {    if (names[i].compareTo(names[j])>0)    {     temp = names[i];     names[i] = names[j];     names[j] = temp;    }   }  }  System.out.println("================================================");      for ( int i = 0 ; i < name.size(); ++ i ){   System.out.println("name: "+ names[i]);}   System.out.println("================================================");     } public static void SortByRate(){   Double temp;  Double rate[] = new Double[name.size()];  for(int i = 0; i < name.size(); i++){   rate[i] = Double.parseDouble(pay_rate.get(i));  }  for (int i = 0; i < name.size(); i++) {   for (int j = i + 1; j < name.size(); j++) {  if (rate[i].compareTo(rate[j])>0) {   temp = rate[i];   rate[i] = rate[j];   rate[j] = temp;  }   }  }  System.out.println("================================================");  for ( int i = 0 ; i < name.size(); ++ i ){   System.out.println("Rate : "+ rate[i]);}  System.out.println("================================================"); }}