Write a java program that simulates a traffic light. The program lets the user select one of three lights: red, yellow or green. When a radio button is selected, the light is turned on, and only one light can be on at a time. No light is on when the program starts.

Program Code:
import java.awt.*;
import java.awt.event.*;
class Traffic extends Frame implements ItemListener
{
String clr="";
Traffic()
{
Checkbox c1,c2,c3;
CheckboxGroup cbg=new CheckboxGroup();
c1=new Checkbox("red",true,cbg);
c2=new Checkbox("green",true,cbg);
c3=new Checkbox("yellow",true,cbg);
setSize(500,500);
setTitle("Traffic Signal");
setVisible(true);
setLayout(new FlowLayout(FlowLayout.CENTER));
add(c1); add(c2); add(c3);
c1.addItemListener(this);
c2.addItemListener(this);
c3.addItemListener(this);
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
}
public static void main(String[] args)
{
new Traffic();
}
public void itemStateChanged(ItemEvent e)
{
clr=(e.getItem()).toString();
repaint();
}
public void paint(Graphics g)
{
g.drawString("Traffic signals",200,250);
g.drawOval(200,300,50,50);
g.drawOval(200,400,50,50);
g.drawOval(200,500,50,50);
g.drawRect(180,200,100,400);
if(clr.equals("red"))
{
g.setColor(Color.red);
g.fillOval(200,300,50,50);
}
if(clr.equals("green"))
{
g.setColor(Color.green);
g.fillOval(200,400,50,50);
}
if(clr.equals("yellow"))
{
g.setColor(Color.yellow);
g.fillOval(200,500,50,50);
}
}
}
Mukesh Rajput

Mukesh Rajput

I am a Computer Engineer, a small amount of the programming tips as it’s my hobby, I love to travel and meet people so little about travel, a fashion lover and love to eat food, I am investing a good time to keep the body fit so little about fitness also..

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