Try it out:
import java.awt.Graphics2D;
import java.awt.geom.Area;
import java.awt.geom.Ellipse2D;
import java.awt.geom.RoundRectangle2D;
// and other stuffes you should have already imported
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
Area area = new Area(
new RoundRectangle2D.Double(0, 0, 200, 200, 50, 50));
area.subtract(new Area(new Ellipse2D.Double(75, 50, 50, 50)));
g.setColor(Color.RED);
((Graphics2D) g).fill(area);
}
Link to Java Tutorial: http://docs.oracle.com/javase/tutorial/2d/ (I'm somewhat lazy now...)