public class Main {
    public static void main(String[] args) {
        Time time = new Time();

        for (int i = 0; i < 10; i++) {
            new Ball(Math.random(), i * 10, time);
        }

        while (true) {
            time.addTime();

            if (time.getTime() == 100) {
                break;
            }

            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

class Ball implements Runnable {
    private int x = 0;
    private int y = 0;
    private double speed;
    private int duration;
    private Time time;

    private boolean finished;

    public Ball(double speed, int duration, Time time) {
        this.speed = speed;
        this.duration = duration;
        this.time = time;

        new Thread(this).start();
    }

    public void move(int x, int y) {
        this.x += x * speed;
        this.y += y * speed;
    }

    @Override
    public void run() {
        while (true) {
            synchronized (time) {
                if (time.getTime() >= duration) {
                    finished = true;
                    break;
                }
            }
        }

        System.out.println("Ball finished");
    }
}

class Time {
    private int time = 0;

    public void addTime() {
        time += 1;
    }

    public int getTime() {
        return time;
    }
}