public class Zadanie1 extends Thread {
    private static long start_time_array[] = new long[1000];
    private static long stop_time_array[] = new long[1000];

    private static long start_time = 0;
    private static long stop_time = 0;

    private static volatile boolean running = true;

    public static void main(String[] args) {
        for (int i = 0; i < 1000; i++) {
            Thread t = new Thread(new Zadanie1());
            running = true;

            start_time = getTime();
            t.start();
            stop_time = getTime();

            start_time_array[i] = stop_time - start_time;

            start_time = getTime();
            stopThread();
            while (t.isAlive()) {
            }
            stop_time = getTime();

            stop_time_array[i] = stop_time - start_time;
        }

        System.out.println("Average start time: " + calculateStartTime());
        System.out.println("Average stop time: " + calculateStopTime());
    }

    @Override
    public void run() {
        while (running) {
        }
    }

    private static void stopThread() {
        running = false;
    }

    private static long getTime() {
        return System.nanoTime();
    }

    private static Double calculateStartTime() {
        long average_time = 0;

        for (int i = 0; i < start_time_array.length; i++) {
            average_time += start_time_array[i];
        }

        return (double) (average_time / start_time_array.length);
    }

    private static Double calculateStopTime() {
        long average_time = 0;

        for (int i = 0; i < stop_time_array.length; i++) {
            average_time += stop_time_array[i];
        }

        return (double) (average_time / stop_time_array.length);
    }
}