adhocMain

import java.awt.*;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JFrame;
import javax.swing.JPanel;

@SuppressWarnings("serial")
public class Aufgabe5 extends JPanel {

    public static int SIZE_X=300;
    public static int SIZE_Y=400;

    private List<Ball> balls;



    public Aufgabe5(Color[] colors, float[] speeds, int[] sizes) throws Exception{
        balls = new ArrayList<Ball>();
        if( colors==null || speeds==null || sizes==null ) throw new Exception("Oje");
        if( colors.length!=speeds.length ||colors.length!=sizes.length ) throw new Exception("Oje");
        for(int i=0; i<colors.length; i++) {
            balls.add( new Ball(this,sizes[i],colors[i],speeds[i]) );
        }
    }

    /**
     * Checks if ball1 collided with ball2.
     * @param ball1
     * @param ball2
     * @return
     */
    public static boolean isCollided(Ball ball1, Ball ball2) {
        int size1 = ball1.getSize();
        int size2 = ball2.getSize();
        double xDif = ball1.getX() - ball2.getX();
        double yDif = ball1.getY() - ball2.getY();
        double distanceSquared = xDif * xDif + yDif * yDif;
        return distanceSquared < (size1 + size2) * (size1 + size2);
    }

    /**
     * Checks if ball is collided with any of the other balls.
     * @param ball
     * @param balls
     * @return
     */
    public static boolean isCollided( Ball ball, List<Ball> balls ) {
        for( Ball ball2 : balls ) {
            if( !ball.equals(ball2) ) {
                if( isCollided(ball, ball2) ) return true;
            }
        }
        return false;
    }

    public List<Ball> getBalls() {
        return balls;
    }

    public void moveBalls() {
        for( Ball ball : balls ) {
            ball.moveBall();
        }
    }

    @Override
    public void paint(Graphics g) {
        super.paint(g);
        Graphics2D g2d = (Graphics2D) g;
        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                RenderingHints.VALUE_ANTIALIAS_ON);


        for( Ball ball : balls ) {
            g2d.setColor(ball.getColor());
            g2d.fillOval(ball.getX(), ball.getY(), ball.getSize(), ball.getSize());
        }


    }

    public static void main(String[] args) throws InterruptedException {
        JFrame frame = new JFrame("Sample Frame");
        Color[] colors=new Color[]{Color.black, Color.blue, Color.GREEN, Color.orange};
        int[] sizes = new int[]{5, 10, 15, 13};
        float[] speeds = new float[]{3.5f, 1.0f, 1.5f, 2.7f};
        Aufgabe5 game=null;
        try {
            game = new Aufgabe5(colors, speeds, sizes);
        frame.add(game);
        frame.setSize(SIZE_X, SIZE_Y);
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocationRelativeTo(null);

        while (true) {
            game.moveBalls();
            game.repaint();
            Thread.sleep(10);
        }
        }catch (Exception e) {e.printStackTrace();}
    }
}