//file: ColorPan.javaimport java.awt.*;import java.awt.event.*;import java.awt.image.*;import javax.swing.*;public class ColorPan extends JComponent {  BufferedImage image;  public void initialize(  ) {    int width = getSize(  ).width;    int height = getSize(  ).height;    int[] data = new int [width * height];    int i = 0;    for (int y = 0; y < height; y++) {      int red = (y * 255) / (height - 1);      for (int x = 0; x < width; x++) {        int green = (x * 255) / (width - 1);        int blue = 128;        data[i++] = (red << 16) | (green << 8 ) | blue;      }    }    image = new BufferedImage(width, height,        BufferedImage.TYPE_INT_RGB);    image.setRGB(0, 0, width, height, data, 0, width);  }  public void paint(Graphics g) {    if (image == null) initialize(  );    g.drawImage(image, 0, 0, this);  }  public static void main(String[] args) {    JFrame f = new JFrame("ColorPan");    f.getContentPane().add(new ColorPan(  ));    f.setSize(300, 300);    f.setLocation(100, 100);    f.addWindowListener(new WindowAdapter(  ) {      public void windowClosing(WindowEvent e) {        System.exit(0);      }    });    f.setVisible(true);  }}