Need some help

[7ussain]

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

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:)

[mtyoung]

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

[masijade]

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.

[7ussain]

I want to get JED
but I can't

[masijade]

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

IOW, what is your actual problem?

[7ussain]

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

[BISWAJIT KUMAR BABU]

it would be easier if u use collection rather than string

[7ussain]

^^
can you expline how?

[BISWAJIT KUMAR BABU]

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.

[mtyoung]

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

[BISWAJIT KUMAR BABU]

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.