GridGuess.java

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
/**
 *  A simple grid guessing game
 */
public class GridGuess extends Applet implements ActionListener
{
    final static int BOARDSIZE = 5;
    private Button[][] ButtonGrid = new Button[BOARDSIZE][BOARDSIZE];
    private Panel p;
    private Label NameLabel;
    private int RowHideSpot, ColHideSpot;

    public void init() {
     setLayout(new BorderLayout());
     p = new Panel();
     p.setLayout(new GridLayout(BOARDSIZE,BOARDSIZE));
       // Randomly select the solution
       RowHideSpot = (int) ((BOARDSIZE-1)  * Math.random() );
       ColHideSpot = (int) ((BOARDSIZE-1)  * Math.random() );
     for(int r=0;r<BOARDSIZE;r++)
      for(int c=0;c<BOARDSIZE;c++) {
           Button button = new Button("");
           if (r == RowHideSpot && c == ColHideSpot)
                button.setActionCommand("target");
                ButtonGrid[r][c] = button;
                ButtonGrid[r][c].setBackground(Color.WHITE);
                ButtonGrid[r][c].addActionListener(this);
                p.add(ButtonGrid[r][c]);
      }
     add(p,BorderLayout.CENTER);

     // Create label at the bottom
     NameLabel = new Label();
     add(NameLabel,BorderLayout.SOUTH);
        NameLabel.setText("" + RowHideSpot  + " " + ColHideSpot);
    }

    public void actionPerformed(ActionEvent e) {
        Button b = (Button)e.getSource();
               // if it's correct button
                    b.setBackground(Color.BLUE);
                    if (b.getActionCommand().equals("target")){
                    NameLabel.setText("CORRECT!");
                    b.setBackground(Color.GREEN);
                    }
                    else
                        NameLabel.setText("Nope.");


    }
    public void ErrorFound(String s) {
        NameLabel.setText("Fatal error, " +
                          "game terminated: " + s);
    }
}