Creating a Java Program to Simulate Traffic Light Using Radio Buttons

How can we simulate a traffic light using radio buttons in Java?

Choose the correct steps to create a Java program that simulates a traffic light:

1. Import necessary packages
2. Create a class that extends JFrame and implements ActionListener
3. Declare necessary components as class variables
4. Create the constructor for the class
5. Implement the actionPerformed method to handle button clicks
6. Create the main method to instantiate the class

Answer:

The correct steps to create a Java program that simulates a traffic light using radio buttons are as follows:

1. Import necessary packages

To import the necessary packages, include the following lines of code:

import javax.swing.*; import java.awt.*; import java.awt.event.*;

2. Create a class that extends JFrame and implements ActionListener

Create a class named TrafficLightSimulator that extends JFrame and implements ActionListener.

3. Declare necessary components as class variables

Declare JRadioButtons for red, yellow, and green lights, as well as a JLabel to display the selected light.

4. Create the constructor for the class

In the constructor, set the layout for JFrame, create radio buttons, add action listeners, and add components to the JFrame.

5. Implement the actionPerformed method to handle button clicks

Implement the actionPerformed method to change the label text and color based on the selected radio button.

6. Create the main method to instantiate the class

In the main method, instantiate the TrafficLightSimulator class, set size, set default close operation, and make JFrame visible.

To simulate a traffic light using radio buttons in Java, you need to follow the steps mentioned above. Importing the necessary packages allows you to work with GUI components and handle events effectively. Creating a class that extends JFrame and implements the ActionListener interface sets up the foundation for your program's functionality.

Declaring the necessary components as class variables ensures that you can access them throughout the class. The constructor for the class initializes the layout, creates radio buttons, assigns action listeners, and adds components to the JFrame for user interaction.

Implementing the actionPerformed method is crucial as it handles the logic when a radio button is selected. Based on the selected button, the label text is updated to reflect the appropriate message, and the text color changes accordingly.

Finally, creating the main method to instantiate the class sets everything in motion. Instantiating the TrafficLightSimulator class, specifying the size of the JFrame, setting the default close operation, and making the JFrame visible allow users to interact with the simulated traffic light.