Is Event Dispatcher Thread

import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;

import javax.swing.AbstractAction;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableCellRenderer;

public class IsEDTExample extends JPanel {
private boolean keepRunning;

private static int RED = 0;

private static int BLUE = 1;

private static int GREEN = 2;

private static int VARIABLE = 3;

private static int SIZE = 3;

private int threadShade;

private ColorTableModel tableModel= new ColorTableModel();

private Thread colorShadeThread;

public IsEDTExample() {
JTable table = new JTable(tableModel);
table.setRowHeight(100);
table.setDefaultRenderer(Object.class, new ColorRenderer());
add(table);

add(new JLabel("Thread Color Shade:"));
ButtonGroup group = new ButtonGroup();
JRadioButton redOption = new JRadioButton("Red");
group.add(redOption);
redOption.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
threadShade = RED;
}
});

JRadioButton blueOption = new JRadioButton("Blue");
group.add(blueOption);
blueOption.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
threadShade = BLUE;
}
});

JRadioButton greenOption = new JRadioButton("Green");
group.add(greenOption);
greenOption.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
threadShade = GREEN;
}
});

redOption.setSelected(true);
this.threadShade = RED;

add(redOption);
add(greenOption);
add(blueOption);

add(new JButton(new RandomColorAction()));

this.keepRunning = true;
this.colorShadeThread = new Thread(new RandomColorShadeRunnable());
this.colorShadeThread.start();
}

private class RandomColorAction extends AbstractAction {
public RandomColorAction() {
super("Create Random Color");
}

public void actionPerformed(ActionEvent e) {
IsEDTExample.this.tableModel.generateRandomColor(VARIABLE);
}
}

private class ColorTableModel extends AbstractTableModel {
private Color[][] colors = new Color[3][3];

public ColorTableModel() {
for (int i = 0; i < SIZE; i++) {
for (int x = 0; x < SIZE; x++) {
colors[i][x] = Color.white;
}
}
}

public int getRowCount() {
return SIZE;
}

public int getColumnCount() {
return SIZE;
}

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(SIZE);
final int column = random.nextInt(SIZE);
final Color color;
if (type == RED) {
color = new Color(random.nextInt(256), 0, 0);
else if (type == BLUE) {
color = new Color(0, 0, random.nextInt(256));
else if (type == GREEN) {
color = new Color(0, random.nextInt(256), 0);
else {
color = new Color(random.nextInt(256), random.nextInt(256), random.nextInt(256));
}

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(100, 100));
}

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 (keepRunning) {
tableModel.generateRandomColor(threadShade);
try {
Thread.sleep(500);
catch (InterruptedException e) {
}
}
}
}

public static void main(String[] a) {
JFrame f = new JFrame("Is Event Dispatch Thread Example");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(new IsEDTExample());
f.pack();
f.setVisible(true);
}

}

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