[JAVA] ANIMATION

import javax.swing.*;

import java.awt.*;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.util.ArrayList;

import java.util.List;

class MovingObject {

    int x, y, width, height;

    Color color;

    public MovingObject(int x, int y, int width, int height, Color color) {

        this.x = x;

        this.y = y;

        this.width = width;

        this.height = height;

        this.color = color;

    }

    public void move(int dx, int dy) {

        x += dx;

        y += dy;

    }

    public void draw(Graphics g) {

        g.setColor(color);

        g.fillRect(x, y, width, height);

    }

}

public class AnimationDemo extends JPanel implements ActionListener {

    private List<MovingObject> objects;

    private Timer timer;

    public AnimationDemo() {

        objects = new ArrayList<>();

        objects.add(new MovingObject(50, 50, 50, 50, Color.RED));

        objects.add(new MovingObject(150, 100, 50, 50, Color.BLUE));

        objects.add(new MovingObject(250, 150, 50, 50, Color.GREEN));

        timer = new Timer(30, this);

        timer.start();

    }

    @Override

    protected void paintComponent(Graphics g) {

        super.paintComponent(g);

        g.setColor(Color.LIGHT_GRAY);

        g.fillRect(0, 0, getWidth(), getHeight());

        for (MovingObject obj : objects) {

            obj.draw(g);

        }

    }

    @Override

    public void actionPerformed(ActionEvent e) {

        for (MovingObject obj : objects) {

            obj.move(1, 1);

            if (obj.x > getWidth()) obj.x = 0;

            if (obj.y > getHeight()) obj.y = 0;

        }

        repaint();

    }

    public static void main(String[] args) {

        JFrame frame = new JFrame("2D Animation");

        AnimationDemo animation = new AnimationDemo();

        frame.add(animation);

        frame.setSize(400, 400);

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.setVisible(true);

    }

}