Creating Java Games in 320x240: A Comprehensive Guide to Building and Running JAR Files**
import javax.swing.*; import java.awt.*; import java.awt.event.*; public class BouncingBall extends JPanel private int x = 100; private int y = 100; private int dx = 2; private int dy = 2; public BouncingBall() setPreferredSize(new Dimension(320, 240)); setBackground(Color.BLACK); Timer timer = new Timer(16, new ActionListener() public void actionPerformed(ActionEvent e) y > getHeight() - 20) dy = -dy; repaint(); ); timer.start(); public void paintComponent(Graphics g) super.paintComponent(g); g.setColor(Color.WHITE); g.fillOval(x, y, 20, 20); public static void main(String[] args) JFrame frame = new JFrame("Bouncing Ball"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.add(new BouncingBall()); frame.pack(); frame.setVisible(true);
javac BouncingBall.java echo "Manifest-Version: 1.0 Main-Class: BouncingBall" > MANIFEST.MF jar cvfm BouncingBall.jar MANIFEST.MF BouncingBall.class