Application.java (judge version)

package runners_judge;

import javax.swing.*;

public class Application

    {
    public static void main(String[] args)
        {
        Start s = null;
        Judge j = new Judge();
        int runners = 0;
        while(runners <= 0)
            {
            try
                {
                runners = Integer.parseInt(JOptionPane.showInputDialog(null, "Insert number of runners:"));
                if(runners >= 0)
                    s = new Start(runners);
                }
            catch(NumberFormatException e)
                {
                JOptionPane.showMessageDialog(null, "Error: invalid number format");
                }
            }
        Thread t = new Thread(j);
        t.setDaemon(true);
        t.start();
        Thread[] threads = new Thread[runners];
        for(int i = 0; i < runners; i++)
            {
            Runner r = new Runner(i, s);
            threads[i] = new Thread(r);
            threads[i].start();
            }
        for(int i = 0; i < runners; i++)
            {
            try
                {
                threads[i].join();
                }
            catch(InterruptedException e)
                {
                e.printStackTrace();
                }
            }
        Judge.printChart();
        }
    }