Color change

package test;

import java.awt.*;
import javax.swing.*;

public class Draw {

    public static void main(String[] args) {
        JFrame frame = new JFrame("Draw test");
        frame.setLayout(new BorderLayout());

        frame.add(new MyPanel());

        frame.pack();
        frame.setLocationRelativeTo(null);

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }

    static class MyPanel extends JPanel {

        int count = 24, size = 20;

        MyPanel() {
            setPreferredSize(new Dimension(count*size, size));
        }

        @Override
        public void paintComponent(Graphics g) {
            super.paintComponent(g);

            int startColor = 0x008000;
            int endColor = 0x0000FF;

            int startRed = (startColor >> 16) & 0xFF;
            int startGreen = (startColor >> 8) & 0xFF;
            int startBlue = startColor & 0xFF;

            int endRed = (endColor >> 16) & 0xFF;
            int endGreen = (endColor >> 8) & 0xFF;
            int endBlue = endColor & 0xFF;

            int steps = count;

            for (int i = 0; i < steps; i++) {
                int newRed = ((steps - 1 - i) * startRed + i * endRed) / (steps - 1);
                int newGreen = ((steps - 1 - i) * startGreen + i * endGreen) / (steps - 1);
                int newBlue = ((steps - 1 - i) * startBlue + i * endBlue) / (steps - 1);
                int result = newRed << 16 | newGreen << 8 | newBlue;
                g.setColor(new Color(result));
                g.fillRect(i*size, 0, size, size);
            }
        }
    }
}