Runner.java (simple version)

package runners;

public class Runner implements Runnable

    {
    private String runnerID;
    public static final int COUNTER = 100;

    public Runner(String id)
        {
        runnerID = id;
        }

    public String toString()
        {
        return runnerID;
        }

    public void run()
        {
        int metresRun = 0;
        while(metresRun < COUNTER)
            {
            try
                {
                metresRun++;
                Thread.sleep((long)(Math.random() * 10));
                System.out.println(runnerID + " has run " + metresRun + " metres");
                }
            catch(InterruptedException e)
                {
                e.printStackTrace();
                }
            }
        System.out.println(runnerID + " has arrived!");
        }
    }