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

public class EventDispatcherExample extends JPanel {
boolean running;
int red = 0;
int blue = 1;
int s = 2;
int thread;
ColorTableModel colorTableModel= new ColorTableModel();
Thread colorShadeThread;

  public EventDispatcherExample() {
    JTable table = new JTable(colorTableModel);
    table.setRowHeight(100);
    table.setDefaultRenderer(Object.class, new ColorRenderer());
    add(table);
    ButtonGroup value = new ButtonGroup();
    JButton button1 = new JButton("Red");
    value.add(button1);
    button1.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent event) {
        thread = red;
      }
    });
    JButton button2 = new JButton("Blue");
    value.add(button2);
    button2.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent event) {
        thread = blue;
      }
    });
    add(button1);
    add(button2);
   
    this.running = true;
    this.colorShadeThread = new Thread(new RandomColorShadeRunnable());
    this.colorShadeThread.start();
  }
  private class ColorTableModel extends AbstractTableModel {
    private Color[][] colors = new Color[3][3];

    public ColorTableModel() {
      for (int i = 0; i < s; i++) {
        for (int j = 0; j < s; j++) {
          colors[i][j] = Color.white;
        }
      }
    }
  public int getRowCount() {
      return s;
    }
  public int getColumnCount() {
      return s;
    }
  public Object getValueAt(int rowIndex, int columnIndex) {
      return colors[rowIndex][columnIndex];
    }
  public void generateRandomColor(int type) {
      Random random = new Random(System.currentTimeMillis());
      final int row = random.nextInt(s);
      final int column = random.nextInt(s);
      final Color color;
      if (type == red) {
        color = new Color(random.nextInt(200), 0, 0);
      } else if (type == blue) {
        color = new Color(0, 0, random.nextInt(200));
      } else {
        color = new Color(random.nextInt(200), random.nextInt(200),
            random.nextInt(200));
      }

      if (SwingUtilities.isEventDispatchThread()) {
        colors[row][column] = color;
        fireTableCellUpdated(row, column);
      } else {
        SwingUtilities.invokeLater(new Runnable() {
          public void run() {
            colors[row][column] = color;
            fireTableCellUpdated(row, column);
          }
        });
      }
    }
  }
   private class ColorRenderer implements TableCellRenderer {
    private JLabel label;

    public ColorRenderer() {
      label = new JLabel();
      label.setOpaque(true);
      label.setPreferredSize(new Dimension(102, 102));
    }
   public Component getTableCellRendererComponent(JTable table, Object
      value,boolean isSelected,boolean hasFocus, int row, int column) {
      label.setBackground((Color) value);
      return label;
    }
  }
  private class RandomColorShadeRunnable implements Runnable {
    public void run() {
      while (running) {
        colorTableModel.generateRandomColor(thread);
        try {
          Thread.sleep(600);
        } catch (Exception e) {}
      }
    }
  }
   public static void main(String[] args) {
    JFrame frame = new JFrame("Event Dispatch Example");
    frame.add(new EventDispatcherExample());
  frame.setSize(450,300);
    frame.setVisible(true);
  }
}