Write a java program that simulates a traffic light. The program lets the user select one of the three lights: red, yellow, or, green with radio buttons.

Write a java program that simulates a traffic light. The program lets the user select one of the three lights: red, yellow, or, green with radio buttons. On selecting a button, an appropriate message with “stop” initially, there is no message shown.

Program Code:

import java.applet.Applet;

import java.awt.Checkbox;

import java.awt.CheckboxGroup;

import java.awt.Color;

import java.awt.Graphics;

import java.awt.event.ItemEvent;

import java.awt.event.ItemListener;

public class Trafficlights extends Applet implements ItemListener{

String msg="";

Checkbox red,yellow,green;

CheckboxGroup cg=null;

public void init()

{

cg=new CheckboxGroup();

Checkbox red=new Checkbox("red",cg,true);

red.setBackground(Color.red);

Checkbox yellow=new Checkbox("yellow",cg,false);

yellow.setBackground(Color.yellow);

Checkbox green=new Checkbox("green",cg,false);

green.setBackground(Color.green);

add(red);

add(yellow);

add(green);

red.addItemListener(this);

yellow.addItemListener(this);

green.addItemListener(this);

}

public void itemStateChanged(ItemEvent ie)

{

repaint();

}

public void paint(Graphics g)

{

Checkbox chk=cg.getSelectedCheckbox();

g.drawString(chk.getLabel()+" Is selected",101,70);

}

}