I want to add try catch exception

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I want to add try catch Exception

import java.util.InputMismatchException;
import java.util.Scanner;
import java.util.ArrayList;



public class LibraryDerive {
static ArrayList<Student> studentList=new ArrayList<Student>();
static ArrayList<Faculty> FacultyList=new ArrayList<Faculty>();
static ArrayList<Book> bookList=new ArrayList<Book>();
static ArrayList<Book> borroeList=new ArrayList<Book>();
   public static void main(String[] args)  {
       Scanner br = new Scanner(System.in);
       int reapeat=13;
       while(reapeat>0) {
           System.out.println("------------------------------------------------------");
           System.out.println("-------WELCOME TO OUR LIBRARY MANAGEMENT SYSTEM-------");
           System.out.println("------------------------------------------------------");
           System.out.println("----------Please choose one of below Options----------");
           System.out.println("1. Add Student");
           System.out.println("2. Add Faculty");
           System.out.println("3. Add Book");
           System.out.println("4. Display All Students");
           System.out.println("5. Display All Faculty");
           System.out.println("6. Display All Books");
           System.out.println("7. Search Student");
           System.out.println("8. Search Faculty");
           System.out.println("9. Search Book");
           System.out.println("10. Borow Book");
           System.out.println("11. Display All Borow Book");
           System.out.println("12. Return Book");
           System.out.println("13. Exit");
           System.out.print("your choice: ");
           int option = br.nextInt();
           System.out.println("------------------------------------------------------");
           switch (option) {
               case 1:
                   System.out.println("Enter Student Id");
                   int id = br.nextInt();
                   boolean chekId=checkStudentId(id);
                   if(chekId) {
                       System.out.println("StudentId Already Exist");
                       break;
                   }
                   br.nextLine();
                   System.out.println("Enter Student FirstName");
                   String surname= br.nextLine();
                   System.out.println("Enter Student lastName");
                   String lastName= br.nextLine();
                   System.out.println("Enter Student Age");
                   int age = br.nextInt();
                   Student student=new Student(id, surname, lastName, age);
                   studentList.add(student);
                   break;
               case 2:
                   System.out.println("Enter Faculty Id");
                   int id1 = br.nextInt();
                   boolean chekId1=checkFacultyId(id1);
                   if(chekId1) {
                       System.out.println("FacultyId Already Exist");
                       break;
                   }
                   br.nextLine();
                   System.out.println("Enter Faculty FirstName");
                   String surname1= br.nextLine();
                   System.out.println("Enter Faculty lastName");
                   String lastName1= br.nextLine();
                   System.out.println("Enter Faculty Age");
                   int age1 = br.nextInt();
                   Faculty Faculty=new Faculty(id1, surname1, lastName1, age1);
                   FacultyList.add(Faculty);
                   break;
                   
                   
               case 3:
                   System.out.println("Enter Book Id :");
                   int bookId = br.nextInt();
                   boolean chekBookId=checkBookId(bookId);
                   if(chekBookId) {
                       System.out.println("Book Id Already Exist");
                       break;
                   }
                   br.nextLine();
                   System.out.println("Enter Book tittle");
                   String tittle= br.nextLine();
                   System.out.println("Enter Book Purchase Date");
                   String purchaseDate= br.nextLine();
                   System.out.println("Enter Book Availability :");
                   String status= br.nextLine();
                   Book b = new Book(bookId, tittle, purchaseDate, status);
                   bookList.add(b);
                   break;
               case 4:
                   displayAllStudent();
                   break;
               case 5:
                   displayAllFaculty();
                   break;
               case 6:
                   displayAllBook();
                   break;
               case 7:
                   System.out.println("Please Enter student Id, you want to Search");
                   int searchStudentId = br.nextInt();
                   searchStudent(searchStudentId);
                   break;
               case 8:
                   System.out.println("Please Enter Faculty Id, you want to Search");
                   int searchFacultyId = br.nextInt();
                   searchFaculty(searchFacultyId);
                   break;
               case 9:
                   System.out.println("Please Enter Book Id, you want to Search");
                   int searchBookId = br.nextInt();
                   searchBook(searchBookId);
                   break;
               case 10:
                   borrowBook();
                   break;
               case 11:
                   DisplayborrowBook();
                   break;
               case 12:
                   returnBook();
                   break;
               case 13:
                   reapeat=-13;
                   break;
            }
           }
   

   }
     private static void returnBook() {
       Scanner br = new Scanner(System.in);
       System.out.println("---------------------");
       System.out.println("Please enter Student Id:");
       int id = br.nextInt();
       System.out.println("Please enter Book Id:");
       int bookId = br.nextInt();
       for(int i=0; i<borroeList.size(); i++) {
               if(borroeList.get(i).getBookId()==bookId){
                      
                   borroeList.get(i).setStatus("AVAILABLE");
                   borroeList.remove(i);
                   break;
               }
           }
         
      
   }
   private static void DisplayborrowBook() {
       for(Book book :borroeList) {
          
               System.out.println("Book Id:"+book.getBookId()+" Tittle :"+book.getTittle()+" Auhtor name:"+book.getAuthorSurname()+
                       " Author LastName:"+book.getAuthorFirsName()+" Purchase Date:"+book.getPurchaseDate()+" staus:"+book.getStatus());
              
          
       }
   }
   private static void borrowBook()  {
       Scanner br = new Scanner(System.in);
       System.out.println("----List of all Available book as Below----");
       for(Book book :bookList) {
           if(book.getStatus().equalsIgnoreCase("AVAILABLE")) {
               System.out.println("Book Id:"+book.getBookId()+" Tittle :"+book.getTittle()+" Auhtor name:"+book.getAuthorSurname()+
                       " Author LastName:"+book.getAuthorFirsName()+" Purchase Date:"+book.getPurchaseDate()+" staus:"+book.getStatus());
              
           }
       }
       System.out.println("---------------------");
       System.out.println("Please enter Student/Faculty Id:");
       int id = br.nextInt();
       System.out.println("Please enter Book Id:");
       int bookId = br.nextInt();
       for(Book book :bookList) {
               if(book.getBookId()==bookId){
                       borroeList.add(book);
                       book.setStatus("Not AVAILABLE");
               }
           }
   }
   private static void searchBook(int searchBookId) {
       boolean search=true;
       for(Book book :bookList) {
           if(book.getBookId()==searchBookId) {
               System.out.println("Book Id:"+book.getBookId()+" Tittle :"+book.getTittle()+" Auhtor name:"+book.getAuthorSurname()+
                       " Author LastName:"+book.getAuthorFirsName()+" Purchase Date:"+book.getPurchaseDate()+" staus:"+book.getStatus());
               search=false;
           }
          
       }
       if(search) {
           System.out.println(searchBookId+" Not exist");
       }
   }
   private static void searchStudent(int searchStudentId) {
       boolean search=true;
       for(Student st :studentList) {
           if(st.getStudentId()==searchStudentId) {
               System.out.println("Student Id:"+st.getStudentId()+" FirstName:"+st.getSurname()+" lastName:"+st.getLastName()+
                       "Age:"+st.getAge());
               search=false;
           }
          
       }
      
       if(search) {
           System.out.println(searchStudentId+" Not exist");
       }
      
   }
   private static void displayAllBook() {
       for(Book book :bookList) {
           System.out.println("Book Id:"+book.getBookId()+" Tittle :"+book.getTittle()+" Auhtor name:"+book.getAuthorSurname()+
                   " Author LastName:"+book.getAuthorFirsName()+" Purchase Date:"+book.getPurchaseDate()+" staus:"+book.getStatus());
       }
      
   }
   private static void displayAllStudent() {
       for(Student st :studentList) {
           System.out.println("Student Id:"+st.getStudentId()+" FirstName:"+st.getSurname()+" lastName:"+st.getLastName()+
                   "Age:"+st.getAge());
       }
      
   }
   private static boolean checkBookId(int bookId) {
       for(Book book: bookList) {
           if(book.getBookId()==bookId) {
               return true;
           }
       }
       return false;
   }
   private static boolean checkStudentId(int id) {
       for(Student st :studentList) {
           if(st.getStudentId()==id) {
               return true;
           }
       }
       return false;
   }
      private static boolean checkFacultyId(int id) {
       for(Faculty st :FacultyList) {
           if(st.getFacultyId()==id) {
               return true;
           }
       }
       return false;}
      private static void displayAllFaculty() {
       for(Faculty st :FacultyList) {
           System.out.println("Faculty Id:"+st.getFacultyId()+" FirstName:"+st.getSurname()+" lastName:"+st.getLastName()+
                   "Age:"+st.getAge());
       }
      
   }
         private static void searchFaculty(int searchFacultyId) {
       boolean search=true;
       for(Faculty st :FacultyList) {
           if(st.getFacultyId()==searchFacultyId) {
               System.out.println("Faculty Id:"+st.getFacultyId()+" FirstName:"+st.getSurname()+" lastName:"+st.getLastName()+
                       "Age:"+st.getAge());
               search=false;
           }
          
       }
      
       if(search) {
           System.out.println(searchFacultyId+" Not exist");
       }
      
   }
   }

What I have tried:

import java.util.InputMismatchException;
import java.util.Scanner;
import java.util.ArrayList;



public class LibraryDerive {
static ArrayList<Student> studentList=new ArrayList<Student>();
static ArrayList<Faculty> FacultyList=new ArrayList<Faculty>();
static ArrayList<Book> bookList=new ArrayList<Book>();
static ArrayList<Book> borroeList=new ArrayList<Book>();
   public static void main(String[] args)  {
       Scanner br = new Scanner(System.in);
       int reapeat=13;
       while(reapeat>0) {
           System.out.println("------------------------------------------------------");
           System.out.println("-------WELCOME TO OUR LIBRARY MANAGEMENT SYSTEM-------");
           System.out.println("------------------------------------------------------");
           System.out.println("----------Please choose one of below Options----------");
           System.out.println("1. Add Student");
           System.out.println("2. Add Faculty");
           System.out.println("3. Add Book");
           System.out.println("4. Display All Students");
           System.out.println("5. Display All Faculty");
           System.out.println("6. Display All Books");
           System.out.println("7. Search Student");
           System.out.println("8. Search Faculty");
           System.out.println("9. Search Book");
           System.out.println("10. Borow Book");
           System.out.println("11. Display All Borow Book");
           System.out.println("12. Return Book");
           System.out.println("13. Exit");
           System.out.print("your choice: ");
           int option = br.nextInt();
           System.out.println("------------------------------------------------------");
           switch (option) {
               try{
               case 1:
                   System.out.println("Enter Student Id");
                   int id = br.nextInt();
                   boolean chekId=checkStudentId(id);
                   if(chekId) {
                       System.out.println("StudentId Already Exist");
                       break;
                   }
                   br.nextLine();
                   System.out.println("Enter Student FirstName");
                   String surname= br.nextLine();
                   System.out.println("Enter Student lastName");
                   String lastName= br.nextLine();
                   System.out.println("Enter Student Age");
                   int age = br.nextInt();
                   Student student=new Student(id, surname, lastName, age);
                   studentList.add(student);
                   break;
               case 2:
                   System.out.println("Enter Faculty Id");
                   int id1 = br.nextInt();
                   boolean chekId1=checkFacultyId(id1);
                   if(chekId1) {
                       System.out.println("FacultyId Already Exist");
                       break;
                   }
                   br.nextLine();
                   System.out.println("Enter Faculty FirstName");
                   String surname1= br.nextLine();
                   System.out.println("Enter Faculty lastName");
                   String lastName1= br.nextLine();
                   System.out.println("Enter Faculty Age");
                   int age1 = br.nextInt();
                   Faculty Faculty=new Faculty(id1, surname1, lastName1, age1);
                   FacultyList.add(Faculty);
                   break;
                   
                   
               case 3:
                   System.out.println("Enter Book Id :");
                   int bookId = br.nextInt();
                   boolean chekBookId=checkBookId(bookId);
                   if(chekBookId) {
                       System.out.println("Book Id Already Exist");
                       break;
                   }
                   br.nextLine();
                   System.out.println("Enter Book tittle");
                   String tittle= br.nextLine();
                   System.out.println("Enter Book Purchase Date");
                   String purchaseDate= br.nextLine();
                   System.out.println("Enter Book Availability :");
                   String status= br.nextLine();
                   Book b = new Book(bookId, tittle, purchaseDate, status);
                   bookList.add(b);
                   break;
               case 4:
                   displayAllStudent();
                   break;
               case 5:
                   displayAllFaculty();
                   break;
               case 6:
                   displayAllBook();
                   break;
               case 7:
                   System.out.println("Please Enter student Id, you want to Search");
                   int searchStudentId = br.nextInt();
                   searchStudent(searchStudentId);
                   break;
               case 8:
                   System.out.println("Please Enter Faculty Id, you want to Search");
                   int searchFacultyId = br.nextInt();
                   searchFaculty(searchFacultyId);
                   break;
               case 9:
                   System.out.println("Please Enter Book Id, you want to Search");
                   int searchBookId = br.nextInt();
                   searchBook(searchBookId);
                   break;
               case 10:
                   borrowBook();
                   break;
               case 11:
                   DisplayborrowBook();
                   break;
               case 12:
                   returnBook();
                   break;
               case 13:
                   reapeat=-13;
                   break;
            }
       } catch (IncorrectGradeException e) {
                System.out.println(e.getMessage());
            }
           }
   

   }
     private static void returnBook() {
       Scanner br = new Scanner(System.in);
       System.out.println("---------------------");
       System.out.println("Please enter Student Id:");
       int id = br.nextInt();
       System.out.println("Please enter Book Id:");
       int bookId = br.nextInt();
       for(int i=0; i<borroeList.size(); i++) {
               if(borroeList.get(i).getBookId()==bookId){
                      
                   borroeList.get(i).setStatus("AVAILABLE");
                   borroeList.remove(i);
                   break;
               }
           }
         
      
   }
   private static void DisplayborrowBook() {
       for(Book book :borroeList) {
          
               System.out.println("Book Id:"+book.getBookId()+" Tittle :"+book.getTittle()+" Auhtor name:"+book.getAuthorSurname()+
                       " Author LastName:"+book.getAuthorFirsName()+" Purchase Date:"+book.getPurchaseDate()+" staus:"+book.getStatus());
              
          
       }
   }
   private static void borrowBook()  {
       Scanner br = new Scanner(System.in);
       System.out.println("----List of all Available book as Below----");
       for(Book book :bookList) {
           if(book.getStatus().equalsIgnoreCase("AVAILABLE")) {
               System.out.println("Book Id:"+book.getBookId()+" Tittle :"+book.getTittle()+" Auhtor name:"+book.getAuthorSurname()+
                       " Author LastName:"+book.getAuthorFirsName()+" Purchase Date:"+book.getPurchaseDate()+" staus:"+book.getStatus());
              
           }
       }
       System.out.println("---------------------");
       System.out.println("Please enter Student/Faculty Id:");
       int id = br.nextInt();
       System.out.println("Please enter Book Id:");
       int bookId = br.nextInt();
       for(Book book :bookList) {
               if(book.getBookId()==bookId){
                       borroeList.add(book);
                       book.setStatus("Not AVAILABLE");
               }
           }
   }
   private static void searchBook(int searchBookId) {
       boolean search=true;
       for(Book book :bookList) {
           if(book.getBookId()==searchBookId) {
               System.out.println("Book Id:"+book.getBookId()+" Tittle :"+book.getTittle()+" Auhtor name:"+book.getAuthorSurname()+
                       " Author LastName:"+book.getAuthorFirsName()+" Purchase Date:"+book.getPurchaseDate()+" staus:"+book.getStatus());
               search=false;
           }
          
       }
       if(search) {
           System.out.println(searchBookId+" Not exist");
       }
   }
   private static void searchStudent(int searchStudentId) {
       boolean search=true;
       for(Student st :studentList) {
           if(st.getStudentId()==searchStudentId) {
               System.out.println("Student Id:"+st.getStudentId()+" FirstName:"+st.getSurname()+" lastName:"+st.getLastName()+
                       "Age:"+st.getAge());
               search=false;
           }
          
       }
      
       if(search) {
           System.out.println(searchStudentId+" Not exist");
       }
      
   }
   private static void displayAllBook() {
       for(Book book :bookList) {
           System.out.println("Book Id:"+book.getBookId()+" Tittle :"+book.getTittle()+" Auhtor name:"+book.getAuthorSurname()+
                   " Author LastName:"+book.getAuthorFirsName()+" Purchase Date:"+book.getPurchaseDate()+" staus:"+book.getStatus());
       }
      
   }
   private static void displayAllStudent() {
       for(Student st :studentList) {
           System.out.println("Student Id:"+st.getStudentId()+" FirstName:"+st.getSurname()+" lastName:"+st.getLastName()+
                   "Age:"+st.getAge());
       }
      
   }
   private static boolean checkBookId(int bookId) {
       for(Book book: bookList) {
           if(book.getBookId()==bookId) {
               return true;
           }
       }
       return false;
   }
   private static boolean checkStudentId(int id) {
       for(Student st :studentList) {
           if(st.getStudentId()==id) {
               return true;
           }
       }
       return false;
   }
      private static boolean checkFacultyId(int id) {
       for(Faculty st :FacultyList) {
           if(st.getFacultyId()==id) {
               return true;
           }
       }
       return false;}
      private static void displayAllFaculty() {
       for(Faculty st :FacultyList) {
           System.out.println("Faculty Id:"+st.getFacultyId()+" FirstName:"+st.getSurname()+" lastName:"+st.getLastName()+
                   "Age:"+st.getAge());
       }
      
   }
         private static void searchFaculty(int searchFacultyId) {
       boolean search=true;
       for(Faculty st :FacultyList) {
           if(st.getFacultyId()==searchFacultyId) {
               System.out.println("Faculty Id:"+st.getFacultyId()+" FirstName:"+st.getSurname()+" lastName:"+st.getLastName()+
                       "Age:"+st.getAge());
               search=false;
           }
          
       }
      
       if(search) {
           System.out.println(searchFacultyId+" Not exist");
       }
      
   }
   }

Posted 25-Apr-21 18:07pm

Member 14999822

Updated 25-Apr-21 19:42pm

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OriginalGriff · Answer 1 · 2021-04-25T19:42:00

You don't add try and catch like that:

Java

    switch (option) {
        try{
        case 1:
            ...
        case 2:
            ...
        case 3:
            ...
        ...
        case 13:
            ...
     }
} catch (IncorrectGradeException e) {
         System.out.println(e.getMessage());
     }
    }

The try...catch block needs to surround the whole switch, not just the cases :

Java

try{
    switch (option) {
        case 1:
            ...
        case 2:
            ...
        case 3:
            ...
        ...
        case 13:
            ...
     }
}
catch (IncorrectGradeException e) {
    System.out.println(e.getMessage());
}

And do yourself a favour: this would have been a whole load more obvious to you if you'd sorted your indentation out!