import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.RoundRectangle2D;
import javax.swing.JFrame;
public class Main extends JFrame {
public Main() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(600, 600);
}
public void paint(Graphics g) {
Graphics2D graphics2 = (Graphics2D) g;
RoundRectangle2D roundedRectangle = new RoundRectangle2D.Float(10, 10, 240, 160, 10, 10);
graphics2.draw(roundedRectangle);
}
public static void main(String args[]) {
new Main().setVisible(true);
}
}