Calling a method and setting an ImageIcon with source from anoth class

Question

I am trying to make a simple game, first I am trying to set up a game board, and make it possible to place units on the board. (This game will probably never be possible to play, I am just using it to try to understand Java, GUI, Swing, and using more than one class).
So far I have 4 classes: Board (extends JFrame, sets up a gameboard, on which to place the pieces), Unit (a class from which the specific units types will inherit), Horse (my only type of unit, which extends the Unit class), and Game (which calls methods from the other classes).
(These don't do much now.. this is what they will do, hopefully).
All these classes are in a package called Gamev1.
In the main method of Game, I do:
---code--
public static void main (String[]args){
new Board().show();
Horse horseUnits[] = new Horse[1];
horseUnits[0] = new Horse();
horseUnits[0].moveUnit(squares[0]);
end of code--
when I debug it I get:
myjava/FirstGraphics/Gamev1/Game.java [25:1] cannot resolve symbol
symbol: variable squares
location: class.myjava.FirstGraphics.Gamev1.Game
horseUnits[0].moveUnitsquares[0]);
1 error
---code----
moveUnit(JLabel moveTo)
is a method in Unit class:
public void moveUnit(JLabel moveTo){
target=moveTo;
target.setIcon(this.image);
if (this.position !=null)
this.position.setIcon(noUnit);
this.position=moveTo;
---end of code---------
squares[] is an array of JLabels which is set up in the Board class, whenever a new Board is created:
---code---
JLabel squares[] = new JLabel[100];
for (int s=0; s<100; s++){
squares[s] = new JLabel();
---end of code---
I tried changing the reference from squares[0] to Board.squares[0] but I got the same error message in debug.
Any idea what is wrong?
I have another problem, which is probably similar.
in the Board class I call:
squares[s].setIcon(Unit.noUnit);
and in the Unit class I have:
static ImageIcon noUnit = new ImageIcon("images//none.gif");
I don't get an error message mentioning it, but (without the attempt to place the horse on the board) the program compiles, but doesn't put this image on the labels. Any idea what is the porblem here?
If I have not given enough information for anyone to help me, please tell me what further information I should give.
Thanks to anyone who answers.

Answer 1

I got it to work with
    Board board = new Board();
    horseUnits[0].moveUnit(board.squares[0]);To use Board.squares[0], squares would have to be static.
The ImageIcon seemed to work okay. I noticed that your post had two slashes in the url [/] - that might throw things off . . .
The code below has the icon call at the end of setLabeLProperties.
I got carried away playing with the graphics so the squares don't work very well.
import java.awt.*;
import java.awt.geom.*;
import javax.swing.*;
public class HumaniBlue {
  public static void main(String[] args) {
    Board board = new Board();
    board.show();
    JLabel label5 = board.getLabel(5);
    //System.out.println("label5 name = " + label5.getText());
    Horse[] horseUnits = new Horse[1];
    horseUnits[0] = new Horse();
    horseUnits[0].moveUnit(board.squares[0]);
class Unit {
  static ImageIcon noUnit = new ImageIcon("images/bclynx.jpg");
  public void moveUnit(JLabel square) {
class Horse extends Unit {
  public Horse() {}
class Board {
  JFrame f;
  JPanel gameBoard;
  int labelSize;
  JLabel[] squares = new JLabel[16];
  GridBagConstraints gbc = new GridBagConstraints();
  public Board() {
    gameBoard = new JPanel(new GridBagLayout()) {
      public void paintComponent(Graphics g) {
        Graphics2D g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
        double width  = getSize().width;
        double height = getSize().height;
        g2.setPaint(Color.white);
        g2.fill(new Rectangle2D.Double(0, 0, width, height));
        g2.setPaint(Color.black);
        Shape line;
        double
          gridSize = (width < height ? width : height) * 0.8,
          gridUnit = (width < height ? width : height) / 5,
          x = (width  - gridSize) / 2,
          y = (height - gridSize) / 2;
        labelSize = (int)gridUnit;
        for(int j = 0; j < 5; j++) {
          line = new Line2D.Double(x, y, x, y + gridSize);      
          g2.draw(line);
          x += gridUnit;
        x = (width - gridSize) / 2;
        for(int j = 0; j < 5; j++) {
          line = new Line2D.Double(x, y, x + gridSize, y);
          g2.draw(line);
          y += gridUnit;
      //System.out.println("width = " + width + "\theight = " + height + "\n" +
      //                   "x = " + x + "\ty = " + y + "\n" +
      //                   "gridSize = " + gridSize + "\tgridUnit = " + gridUnit);
    f = new JFrame();
    f.getContentPane().add(gameBoard);
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setSize(400,400);
    f.setLocation(600,200);
    //f.setVisible(true);
    setLabelProperties();
  private void setLabelProperties() {   
    int
      r   = 30,
      g   = 30,
      b   = 0,
      inc = 55;
    //System.out.println("labelSize = " + labelSize);
    for(int j = 0; j < squares.length; j++) {
      squares[j] = new JLabel("Square " + j, JLabel.CENTER);
      squares[j].setOpaque(true);
      squares[j].setPreferredSize(new Dimension(73, 73));
    // add labels
    int index = 0;
    gbc.gridx = 0;
    gbc.gridy = 0;
    for(int y = 0; y < 4; y++) {
      for(int x = 0; x < 4; x++) {
        index = y * 4 + x;
        squares[index].setBackground(new Color(r,g,b,90));
        gameBoard.add(squares[index], gbc);
        gbc.gridx++;
        r += inc;
      gbc.gridy++;
      gbc.gridx = 0;
      r = 90;
      g += inc;
    squares[9].setIcon(Unit.noUnit);
  public void show() {
    f.setVisible(true);
  public JLabel getLabel(int index) {
    return squares[index];
}