unable to exit program..

[Abhradeep Banerjee]

i am unable to exit the program

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

public class lab6Ex1 {

    public static void main(String[] args) {

        //declare var
        FileReader fr = null;
        BufferedReader br = null;
        String inFile = "Travel_Records.txt";
        String line = "";
        final String INPUT_PROMPT1 = "\nPlease select one of the following options: \n"
                + "1)   Search flights by IC number \n"
                + "2)   Search flights by departure date \n"
                + "3)   Display all flights \n"
                + "4)   Insert new record or remove old record \n"
                + "5)   Exit program ";

        final String IC_PROMPT = "\n\n\nPlease enter the IC number";
        final String Dept_PROMPT = 
              "\n\n\nPlease enter the departure date in the following format" + "dd/mm/yyyy";
        final String Insert_Remove_PROMPT = "\n\n\n \n"
                + "1) Remove Record\n"
                + "2) Insert Record\n"
                + "3) Return to previous menu\n"
                + "4) Exit Program";

        final String Insert_Record = 
                "Please enter new record in the following format: Serial Number|SXXXXXXXG|Name |" +
                " Country |MM/DD/YYYY | Time in 24 hr clock | Country | MM/DD/YYYY | Time in 24 hr clock";
        final String Delete_Record = "Please enter the serial number of the record to delete";
        //declare var to contain the record files


        String index;
        String NRIC;
        String Name;
        String srcCountry;
        String deptDate;
        String deptTime;
        String destCountry;
        String arrDate;
        String arrTime;


        //delare and initiate new linked list

        LinkedList<Travel> LL = new LinkedList<Travel>();


        try {

            //initiate filereader and bufferedreader objects

            fr = new FileReader(inFile);
            br = new BufferedReader(fr);

            //read 1 line from the file
            line = br.readLine();

            // while line is not null

            while (line != null) {
                StringTokenizer tokenizer = new StringTokenizer(line, "|");
                //index = Integer.parseInt(tokenizer.nextToken());
                index = tokenizer.nextToken();
                NRIC = tokenizer.nextToken();
                Name = tokenizer.nextToken();
                srcCountry = tokenizer.nextToken();
                deptDate = tokenizer.nextToken();
                deptTime = tokenizer.nextToken();
                destCountry = tokenizer.nextToken();
                arrDate = tokenizer.nextToken();
                arrTime = tokenizer.nextToken();
                //create new Travel object
                Travel travel = new Travel(
                   index, NRIC, Name, srcCountry, deptDate, deptTime, destCountry, arrDate, arrTime);

                //add this item object to Llist
                LL.addFirst(travel);

                //read another line from file
                line = br.readLine();
            }
            //close buffered reader
            br.close();
        } catch (FileNotFoundException e) {
            System.out.println("The file" + inFile + "was not found");
        } catch (IOException e) {
            System.out.println("Reading error");
        } finally {
            //close filereader
            if (fr != null) {
                try {
                    fr.close();
                } catch (IOException e) {
                    System.out.println("error closing file");
                }
                //print out the input prompt



            }

        }



        //create readers to read from user input
        try {


            BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

            //read one line from user

            System.out.println(INPUT_PROMPT1);

            line = reader.readLine();

            while (!line.equals("0")) {

                //read one line from user
                Collections.sort(LL);
                int counter = 0;
                if (line.equals("1")) {
                    System.out.println(IC_PROMPT);

                    BufferedReader IC = new BufferedReader(new InputStreamReader(System.in));
                    line = IC.readLine();
                    for (int n = 0; n < LL.size(); n++) {

                        if (LL.get(n).NRIC.toUpperCase().contains(line.toUpperCase())) {

                            //printout information of the video
                            System.out.println(LL.get(n));
                            counter = counter + 1;
                        }
                    }
                    if (counter == 0) {
                        System.out.println("NRIC number not found");
                    }
                } else if (line.equals("2")) {

                    System.out.println(Dept_PROMPT);
                    BufferedReader Dept = new BufferedReader(new InputStreamReader(System.in));
                    line = Dept.readLine();
                    int flag = 0;
                    for (int n = 0; n < LL.size(); n++) {

                        if (LL.get(n).deptDate.toUpperCase().contains(line.toUpperCase())) {

                            //printout information of the video
                            System.out.println(LL.get(n));
                            flag = flag + 1;
                        }
                    }

                    if (flag == 0) {
                        System.out.println("No such record");

                    }

                } else if (line.equals("3")) {
                    for (int n = 0; n < LL.size(); n++) {
                        System.out.println(LL.get(n));
                    }
                } else if (line.equals("4")) {
                    System.out.println(Insert_Remove_PROMPT);
                    BufferedReader Insert = new BufferedReader(new InputStreamReader(System.in));
                    line = Insert.readLine();

                    if (line.equals("1")) {
                        System.out.println(Delete_Record);
                        BufferedReader delete = new BufferedReader(new InputStreamReader(System.in));
                        line = delete.readLine();

                        FileWriter fwp = new FileWriter(inFile);
                        BufferedWriter bwp = new BufferedWriter(fwp);
                        PrintWriter delFile = new PrintWriter(bwp);

                        try {



                            for (int n = 0; n < LL.size(); n++) {

                                if (LL.get(n).index.toUpperCase().contains(line.toUpperCase())) {
                                    LL.remove(n);
                                    delFile.println(LL.get(n));

                                }
                                delFile.close();

                            }

                        } catch (NoSuchElementException e) {
                            System.out.print("key in full format");
                        }



                    } else if (line.equals("2")) {


                        System.out.println(Insert_Record);
                        BufferedReader insert = new BufferedReader(new InputStreamReader(System.in));
                        line = insert.readLine();


                        FileWriter fwp = new FileWriter(inFile);
                        BufferedWriter bwp = new BufferedWriter(fwp);
                        PrintWriter outFile = new PrintWriter(bwp);

                        try {
                            StringTokenizer tokenizer = new StringTokenizer(line, "|");
                            //index = Integer.parseInt(tokenizer.nextToken());
                            index = tokenizer.nextToken();
                            NRIC = tokenizer.nextToken();
                            Name = tokenizer.nextToken();
                            srcCountry = tokenizer.nextToken();
                            deptDate = tokenizer.nextToken();
                            deptTime = tokenizer.nextToken();
                            destCountry = tokenizer.nextToken();
                            arrDate = tokenizer.nextToken();
                            arrTime = tokenizer.nextToken();

                            //create new Travel object
                            Travel travel = new Travel(
                                    index, NRIC, Name, srcCountry, deptDate, deptTime, destCountry, arrDate, arrTime);

                            //add this item object to Llist
                            LL.add(travel);

                            for (int i = 0; i < LL.size(); i++) {
                                outFile.println(LL.get(i));
                            }

                            outFile.close();


                        } catch (NoSuchElementException e) {
                            System.out.print("key in full format");
                        } catch (NumberFormatException e) {
                            System.out.print("NumberFormat");
                        }


                    } else if (line.equals("3")) {
                        System.out.println("");

                    } else if (line.equals("5")) {
                        System.out.println("Are you sure you want to exit? Y/N");
                        BufferedReader exit = new BufferedReader(new InputStreamReader(System.in));
                        line = exit.readLine();
                        if (line.equalsIgnoreCase("Y")) {
                            System.exit(0);

                        }

                        
                    }
                }

                System.out.println(INPUT_PROMPT1);
                line = reader.readLine();
            }
        } catch (IOException e) {
            System.out.println("error");
        }
    }
}
    

[Campbell Ritchie]

Do you really expect anybody to go through 273 lines of code? Post an SSCCE or tell us where the program is supposed to exit.
Have you got any endless loops?