Need some help

Hi

this is the question:
In airlines reservation systems "dan jeddah" command is used to get the airport code for Jeddah city.
Design and implement a java code that simulate the "dan" command.
Use the following file as a dataset:

I can't put the link:confused:

Use contains method in String class to look up the city and return the city code.
e.g. dan Jeddah returns JED

and I wrote this code

Code:

---

import java.io.*;
import java.util.*;
public class Dan{
        public static void main (String[] args){
       
               
        Scanner input= null;
        try{
                input = new Scanner(new File("C:\\Users\\Lost Spirit\\Desktop\\iata-airport-codes.txt"));
        }       
                catch(FileNotFoundException e){
                        System.out.println("not found the file");
                        System.exit(0);
                }
               
        Scanner h= new Scanner(System.in);
                String we= h.nextLine();
               
                String line= null, er= null;
                int qwe;
                while (input.hasNextLine()){
                        line= input.nextLine();
                qwe= line.indexOf(we);
                er= line.substring((qwe-4),(qwe-1));
               
                }
                input.close();
                System.out.println(qwe);
               
        }
       
       
}

---

any suggestion will help me:)

String we should be "dan xxx" string
String line ... i dont know the format
but i think String line would not consist "dan"
qwe seems always 0
String.substring( -ve, -ve) should throw IndexOutOfBoundsException

also
"jeddah" search for "Jeddah City"
so, you need to handle case of letter

Okay, you've shown us the assignment, and what you did, but you have not told us what compiler/errormessages you are getting nor what it is (or is not) doing that it should (or should not) do.

I want to get JED
but I can't

Okay, that doesn't help us anymore than the rest does.

IOW, what is your actual problem?

is there any code to look up in txt file by scanner and get the first word in the line which I looked up in it

it would be easier if u use collection rather than string

^^
can you expline how?

hi,
i think u can go for a collection map where u can store the name of the city and that code as a key value pair .
if u can use this rather than the file. u can easily extract the city code by just creating a iterator.

BISWAJIT KUMAR BABU
how to handle letter case in the key of the map?

hi mtyoung,
map needs a key & value pair. the value has to be an type of object. cant we make the value we are extracting a string object.