public class Producent extends Thread
{
    private String id;
    private Bufor buff;
    private int powt;

    public Producent(String _id, Bufor _buff, int _powt) {
        this.id = _id;
        this.buff = _buff;
        this.powt = _powt;
    }

    public void run()
    { for (int i = 0; i < this.powt; i++)
    {
        synchronized (buff) {
            String in = "Dana = [" + this.id + ", " + i + ", " + (int) (Math.random() * 100) + "]";
            buff.add(in);
            //System.out.println("[" + this.id + ", " + i + "] >> " + in);
            System.out.println(in);
            try {
                sleep((int) (Math.random() * 10) + 1);
            } catch (InterruptedException e) {
            }
        }
    }
    }
}