ThreadedPrimeNumbersSeeker.java

public class ThreadedPrimeNumbersSeeker
        extends Thread
{

    private static final int ceiling = 100;
    private static final int interval = 1000;
    private static final int delay = 100;
    public int count = 0;
    public int current = 2;
    public int[] primes = null;

    public static void main( String[] args )
    {
        System.out.println( "Step, Current int, # primes" );
        ThreadedPrimeNumbersSeeker seeker = new ThreadedPrimeNumbersSeeker();
        seeker.start();
        int seekStep = 0;
        while( true )
        {
            seekStep++;
            System.out.println( seekStep + ", " + seeker.current + ", " + seeker.count );
            try
            {
                sleep( interval );
            }
            catch( InterruptedException e )
            {
                System.out.println( "Monitor interrupted." );
            }
        }
    }

    @Override
    public void run()
    {
        primes = new int[ ceiling ];
        while( count < ceiling )
        {
            current++;
            int j = 2;
            boolean isPrime = true;
            while( j < current / 2 && isPrime )
            {
                isPrime = current % j > 0;
                j++;
            }
            if( isPrime )
            {
                count++;
                primes[count - 1] = current;
            }
            try
            {
                sleep( delay );
            }
            catch( InterruptedException e )
            {
                System.out.println( "Runner interrupted." );
            }
        }
    }

}