import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class TransparentRectangles extends JPanel {
public void paint(Graphics g) {
super.paint(g);
Graphics2D g2d = (Graphics2D) g;
for (int i = 1; i <= 10; i++) {
g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, i * 0.1f));
g2d.fillRect(50 * i, 20, 50, 50);
}
}
public static void main(String[] args) {
JFrame frame = new JFrame("Transparent Rectangles");
frame.add(new TransparentRectangles());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(600, 100);
frame.setVisible(true);
}
}