Ex.3 ของไข่มุก

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package statistics;

import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.Scanner;

/**
 *
 * @author 6272user
 */
class Airline implements Comparable<Airline> {
   private String name;
   private int    founded, aircrafts, destinations;
   public void report()                 { /* print result */ }

   @Override
   public int compareTo(Airline o) {
       if(this.destinations < o.destinations) return -1;
       else if(this.destinations > o.destinations) return 1;
       else return 0;
   }

}
////////////////////////////////////////////////////////////////////////////////

class SortAirlinesByCapacity implements Comparator<Airline> {
    public int compare(Airline a1, Airline a2) {
        ;
    }
}
////////////////////////////////////////////////////////////////////////////////

public class NewMain {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws FileNotFoundException {
        ArrayList<Airline> alObj = new ArrayList<Airline>();
        String infile = "airlines.txt";
        try (Scanner scanfile = new Scanner(new File(infile))) {
             while(scanfile.hasNext()) {

             }
        }
        catch(FileNotFoundException e) {
            System.err.println("An error occurs. End program.");
            System.exit(-1);
        }

        System.out.printf("Sort by [d = default, c = capacity, t = timeline, q = quit] >> ");
        Scanner scan = new Scanner(System.in);
        char choices = scan.next().charAt(0);
        switch(Character.toUpperCase(choices)) {
            case 'C':
                System.out.println("C");
                break;
            case 'D':
                System.out.println("D");
                break;
            case 'T':
                System.out.println("T");
                break;
        }

    }

}