Java switch case always runs default code

The switch case always runs the default code. I read something about a "new line" issue, but i think that is not the case here. Because i copy the first char from the "stringclient" string into a char variable. But when i run this with my ATMServer class in eclpise, it's working just fine. Only when i execute them from cmd, this problem appears. So anyone knows what's going on? Please help. Thanks.

import java.io.*;
import java.net.*;

public class ATMClient {

    private static final int PORT = 20000;

    private static final char DRAW_STR = 'Α';
    private static final char DEPOSIT_STR = 'Κ';
    private static final char BALANCE_STR = 'Υ';
    private static final char EXIT_STR = 'Ε';

    private static boolean hasEnded = false;

    public static void main(String args[]) throws IOException {
        Socket dataSocket = new Socket("localhost",PORT);
        InputStream is = dataSocket.getInputStream();
        BufferedReader in = new BufferedReader(new InputStreamReader(is));

        OutputStream os = dataSocket.getOutputStream();
        PrintWriter out = new PrintWriter(os, true);


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

        String stringclient;

        while(!hasEnded){
            printMenu();

            stringclient = input.readLine();

            char optionCode = stringclient.charAt(0);
            String tempData;
            int amount;

            switch(optionCode){
            case EXIT_STR:
                out.println(String.valueOf(EXIT_STR));
                hasEnded = true;
                continue;
            case DRAW_STR:
                tempData = stringclient.substring(1);

                try{
                    amount = Integer.parseInt(tempData);
                }catch(NumberFormatException e){
                    System.out.println("Το ποσό πρέπει να είναι αριθμός. Δοκιμάστε ξανά.");
                    System.out.println();
                    continue;
                }

                if(amount > 420){
                    System.out.println("Μπορείτε να κάνετε ανάληψη έως 420 ευρώ.");
                    System.out.println();
                    continue;
                }

                out.println(String.valueOf(DRAW_STR) + amount);
                break;

            case DEPOSIT_STR:
                tempData = stringclient.substring(1);

                try{
                    amount = Integer.parseInt(tempData);
                }catch(NumberFormatException e){
                    System.out.println("Το ποσό πρέπει να είναι αριθμός. Δοκιμάστε ξανά.");
                    System.out.println();
                    continue;
                }

                out.println(String.valueOf(DEPOSIT_STR) + amount);

                break;

            case BALANCE_STR:
                out.println(String.valueOf(BALANCE_STR));
                break;

            default:
                System.out.println("Λάθος επιλογή. Δοκιμάστε ξανά.");
                System.out.println();
                continue;
            }

            String reply = in.readLine();

            System.out.println(reply);
        }

        out.close();
        os.close();
        in.close();
        is.close();
        input.close();
        dataSocket.close();
    }
}