Create a non-cyclic gradient in Java

import java.awt.Color;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
/* w w  w  .  ja va 2s.co m*/
import javax.swing.JComponent;
import javax.swing.JFrame;

class MyCanvas extends JComponent {
  public void paint(Graphics g) {
    Graphics2D g2d = (Graphics2D) g;

    Color startColor = Color.red;
    Color endColor = Color.blue;

    int startX = 10, startY = 20, endX = 200, endY = 200;
    
    GradientPaint gradient = new GradientPaint(startX, startY, startColor, endX, endY, endColor);
    g2d.setPaint(gradient);

    g2d.fill(new Rectangle(20,20,200,200));  
  }
}

public class Main {
  public static void main(String[] a) {
    JFrame window = new JFrame();
    window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    window.setBounds(30, 30, 450, 450);
    window.getContentPane().add(new MyCanvas());
    window.setVisible(true);
  }
}