Stupid Java Coding Problem

[~*Ishida-Uryuu*~]

I'm a very very basic beginner at Java, and I'm trying to do this assignment out of my textbook.

I wrote this:

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

public class GUIWindow {

public static void main(String[] args) {
JFrame theGUI = new JFrame();
theGUI.setTitle("GUI Example");
String inputStr = JOptionPane.showInputDialog("Number of rows", "5");
if (inputStr == null) return;
int rows = Integer.parseInt(inputStr);
inputStr = JOptionPane.showInputDialog("Number of columns", "5");
if (inputStr == null) return;
int cols = Integer.parseInt(inputStr);
theGUI.setSize(cols * 50, rows * 50);
theGUI.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container pane = theGUI.getContentPane();
pane.setLayout(new GridLayout(rows, cols));
Random gen = new Random();
for (int i = 1; i <= rows * cols; i++) {
int red = gen.nextInt(256);
int green = gen.nextInt(256);
int blue = gen.nextInt(256);
Color backColor = new Color(red, green, blue);
ColorPanel panel = new ColorPanel(backColor);
pane.add(panel);
}

theGUI.setVisible(true);

}

}

But the stupid compiler keeps giving me this error:

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I:\java\GUIWindow.java:27: cannot find symbol
symbol  : class ColorPanel
location: class GUIWindow
ColorPanel panel = new ColorPanel(backColor);
^
I:\java\GUIWindow.java:27: cannot find symbol
symbol  : class ColorPanel
location: class GUIWindow
ColorPanel panel = new ColorPanel(backColor);
                       ^
2 errors

Tool completed with exit code 1

What the hell did I do wrong?!

[DavidGee]

Well there is no accessible class named ColorPanel. I think you want to replace

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ColorPanel panel = new ColorPanel(backColor);

with

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Panel panel = new Panel();
panel.setBackground(backColor);

Either that, or import the package where the ColorPanel class is defined.

[~*Ishida-Uryuu*~]

Any idea which package that might be?

[DavidGee]

If you're really supposed to use "ColorPanel," then my guess is that you're supposed to be learning inheritance and code ColorPanel yourself as a subclass of Panel. This should be correct:

class ColorPanel extends Panel
{
     ColorPanel(Color color)
     {
          setBackground(color);
     }
}