Java tutorial
import java.awt.Color; import java.awt.GradientPaint; import java.awt.Graphics; import java.awt.Graphics2D; import javax.swing.JFrame; import javax.swing.JPanel; public class GradientsLine extends JPanel { public void paint(Graphics g) { super.paint(g); Graphics2D g2d = (Graphics2D) g; GradientPaint gp1 = new GradientPaint(5, 25, Color.green, 2, 2, Color.black, true); g2d.setPaint(gp1); g2d.fillRect(20, 140, 300, 40); } public static void main(String[] args) { JFrame frame = new JFrame("GradientsLine"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.add(new GradientsLine()); frame.setSize(350, 350); frame.setLocationRelativeTo(null); frame.setVisible(true); } }