anal

package a1;
import java.awt.*;
import java.awt.event.ActionEvent;
import javax.swing.Timer;
import java.awt.event.ActionListener;
import javax.swing.*;
public class A1 {
    public static void main(String[] args) {
        Okno a1 = new Okno("Quake V 0.01", 200, 200, 800, 600);
    }
}
//---------------------------------
class Okno extends JFrame {
    private Container tlo;
    private JButton start;
    private JButton stop;
    private JButton koniec;
    private MojPanel cent;
    private Timer t;

    public Okno(String atyt, int ax0, int ay0, int aszer, int awys) {
        super(atyt);
        setBounds(ax0, ay0, aszer, awys);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        tlo = getContentPane();
        budujUI();
        setVisible(true);
    }
    private void budujUI() {
        tlo.setLayout(new BorderLayout());
        JPanel gorny = new JPanel();
        gorny.setBackground(Color.GRAY);
        gorny.setLayout(new FlowLayout(FlowLayout.CENTER));
        cent = new MojPanel();
        cent.setLayout(new FlowLayout(FlowLayout.CENTER));
        tlo.add(BorderLayout.NORTH, gorny);
        tlo.add(cent);
        koniec = new JButton("Koniec");
        start = new JButton("Start");
        stop = new JButton("Stop");
        koniec.addActionListener(new KlikKoniec());
        start.addActionListener(new KlikStart());
        stop.addActionListener(new KlikStop());

        gorny.add(koniec);
        gorny.add(start);
        gorny.add(stop);

        t = new Timer(10, new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent ae) {
                cent.poruszkulki();
            }
        });
    }
    class KlikKoniec implements ActionListener
    {
        @Override
        public void actionPerformed(ActionEvent ae) {
            t.stop();
            dispose();
        }
    }
    class KlikStart implements ActionListener
    {
        @Override
        public void actionPerformed(ActionEvent ae) {
            t.start();
        }
    }
    class KlikStop implements ActionListener
    {
        @Override
        public void actionPerformed(ActionEvent ae) {
            t.stop();
        }
    }
    class MojPanel extends JPanel {
       Kulka kula = new Kulka(Color.WHITE, 300, 300, 100, 10, -1);
       Kulka kula2 = new Kulka(Color.RED, 300, 300, 50, 5, -6);
        public MojPanel() {
            super();
            setBackground(Color.BLACK);
        }
        @Override
        public void paintComponent(Graphics g) {
            super.paintComponent(g);
            kula2.rysuj(g);
            kula.rysuj(g);
        }
        public void poruszkulki() {
            kula2.porusz(getWidth(),getHeight());
            kula.porusz(getWidth(),getHeight());
            repaint();
        }
    }}

class Kulka {
        private int x, y, r, vx, vy;
        Color a;
        public Kulka(Color aa, int ax, int ay, int ar, int avx, int avy) {
            a = aa;
            x=ax;
            y=ay;
            r=ar;
            vx=avx;
            vy=avy;
        }
        public void rysuj(Graphics g) {
                g.setColor(a);
                g.fillOval(x-r, y-r, 2*r, 2*r);
        }
        public void porusz(int szer, int wys) {
            if(x >= szer-r || x <= r) {
                vx=-vx;
            }
            if(y >= wys-r || y <= r) {
                vy=-vy;
            }
            x+=vx;
            y+=vy;
        }
}