The source code looks like:

import java.applet.*;
import java.awt.*;
import java.awt.Graphics;

public class RoundRectDemo extends Applet {

	public void init() {
		resize(200, 100);
	}

	public void paint(Graphics g) {
		g.drawRoundRect(10,10,50,50,10,10);
		g.drawRoundRect(70,10,70,50,20,7);
		g.fillRoundRect(150,10,40,70,5,15);
	}

}