import java.util.*;

public class SinCalcThread extends Thread {

    private static Random rand = new Random();
    private static double sum = 0;
    private static int count = 0;

    private int iterations;

    public SinCalcThread(int iterations) {
        this.iterations = iterations;
        start();
    }

    public void run() {
       ...
    }

    public static int getCount() {
        return count;
    }

    public static double getSum() {
        return sum;
    }
}