Runner.java (judge version)

package runners_judge;

public class Runner implements Runnable

    {
    private int runnerID;
    private Start start;
    private int metresRun;
    public static final int METRES_TO_RUN = 100;

    public Runner(int id, Start s)
        {
        runnerID = id;
        start = s;
        metresRun = 0;
        }

    public int getRunnerID()
        {
        return runnerID;
        }

    public String toString()
        {
        return "Runner " + runnerID;
        }

    public synchronized boolean hasArrived()
        {
        return METRES_TO_RUN == metresRun;
        }

    public void run()
        {
        boolean ready = start.isReady();
        start.setReady(this);
        try
            {
            while(metresRun < METRES_TO_RUN)
                {
                if(start.isReady() && start.isReady() != ready)
                    Thread.sleep((long)(Math.random() * 10));
                if(start.isReady())
                    {
                    metresRun++;
                    System.out.println(toString() + " has run " + metresRun + " metres");
                    if(metresRun < METRES_TO_RUN)
                        Thread.sleep((long)(Math.random() * 10));
                    }
                }
            System.out.println(toString() + " has arrived!");
            Judge.addRunner(this);
            }
        catch(InterruptedException e)
            { }
        }
    }