Start.java (synchronized start version)

package runners_advanced;

public class Start

    {
    private boolean ready = false;
    private final int runners;

    public Start(int r)
        {
        runners = r;
        }

    public synchronized void setReady(Runner r)
        {
        if(!ready && runners > 0 && r.getRunnerID() == runners - 1)
            {
            ready = true;
            notifyAll();
            }
        }

    public synchronized boolean ready()
        {
        return ready;
        }
    }