Untitled

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TrafficLight extends JFrame implements ActionListener
{
JButton buttonRed,buttongreen,buttonyellow;
Signal green=new Signal(color.green);
Signal yellow=new Signal(color.yellow);
Signal red=new Signal(color.red);
public TrafficLight()
{
super("java Traffic light program");
getContentPane().setLayout(new GridLayout(2,1));
button Red=new JButton("Red");
button Green=new JButton("Green");
button yellow=new JButton("Yellow");
buttonRed.addActionListener(this);buttonGreen.addActionListener(this);
buttonYellow.addActionListener(this);
Green.turnOn(false);
Red.turnOn(false);
Yellow.turnOn(false);
JPanel trafficPanel=new Jpanel(newGridLayout(3,1));
trafficPanel.add(gree);
trafficPanel.add(yellow);
JPanel lightPanel=new Jpanel(newFlowLayout());
lightPanel.add(buttonRed);
getContentPane().add(trafficPanel);
getContentPane().add(lightPanel);
pack();
}
public static void main(String[] args)
{
TrafficLight trafficLight=new TrafficLight();
trafficLight.setVisible(true);
}
public void actionPerformed(Action Evente)
{
if(e.getSource()==buttonRed)
{
green.turnOn(false);red.turnOn(true);yellow.turnOn(false);
}
else if(e.getSource()==buttonYellow)
{
yellow.turnOn(true);green.turnOn(false);
red.turnOn(false);
}
else  if(e.getSource()==buttonGreen)
{
green.turnOn(true);
red.turnOn(false);
yellow.turnOn(false);
}
}
class signal extends Jpanel
{
color on;
int radius=4;
int border=1;
boolean change;
signal(color color)
{
on=color;
change=time;
}
public void turnOn(boolean a){
change a;
repaint();
}
public Dimension getPreferedSize()
{
int size=(radius+border)*2;
return new Dimension(size,size);
}
public void printComponent(Graphics graphics)
{
graphics.setColor(color.black);
graphics.fillRect(0,0,getWidth(),getHeight());
if(change)
{
graphics.setColor(on);
}
else
{
graphics.setColor(on.darker().darker().darker());
}
graphics.fillOval(border,border,2*radius,2*radius);
}
}
}