This programme is done by a chegg expert.

Can anyone explain how this programme is work step by step. Please answe as soon as possible.....

import java.awt.BorderLayout; import java.applet.AudioClip;
	import java.awt.Color;
	import java.awt.Component;
	import java.awt.GridLayout;
	import java.awt.Toolkit;
	import java.awt.event.ActionEvent;
	import java.awt.event.ActionListener;
	import java.net.URL;
	import javax.sound.sampled.AudioInputStream;
	import javax.sound.sampled.AudioSystem;
	import javax.sound.sampled.Clip;
	import javax.swing.BoxLayout;
	import javax.swing.Icon;
	import javax.swing.ImageIcon;
	import javax.swing.JApplet;
	import javax.swing.JButton;
	import javax.swing.JFrame;
	import javax.swing.JLabel;
	import javax.swing.JOptionPane;
	import javax.swing.JPanel;
	public class Jeopardy implements ActionListener {
	private JButton firstButton;
	private JButton secondButton;
	private JButton thirdButton, fourthButton;
	private JPanel quizPanel;
	int score = 0;
	JLabel scoreBox = new JLabel("0");
	int buttonCount = 0;
	public static void main(String[] args) {
	new Jeopardy().start();
	}
	private void start() {
	JFrame frame = new JFrame();
	quizPanel = new JPanel();
	frame.setLayout(new BorderLayout());
	// 1. Make the frame show up
	frame.setVisible(true);
	// 2. Give your frame a title
	frame.setTitle("Jeopardy");
	// 3. Create a JPanel variable to hold the header using the createHeader
	// method
	JPanel panel = createHeader("Quantum Physics");
	// 4. Add the header component to the quizPanel
	quizPanel.add(panel);
	// 5. Add the quizPanel to the frame
	frame.add(quizPanel);
	// 6. Use the firstButton variable to hold a button using the
	// createButton method
	firstButton = createButton("$100");
	// 7. Add the firstButton to the quizPanel
	quizPanel.add(firstButton);
	// 8. Write the code inside the createButton() method below. Check that
	// your game looks like Figure 1 in the Jeopardy Handout -
	// 9. Use the secondButton variable to hold a button using the
	// createButton method
	secondButton = createButton("$200");
	// 10. Add the secondButton to the quizPanel
	quizPanel.add(secondButton);
	// 11. Add an action listeners to the buttons (2 lines of code)
	firstButton.addActionListener(this);
	secondButton.addActionListener(this);
	// 12. Fill in the actionPerformed() method below
	frame.pack();
	quizPanel.setLayout(new GridLayout(buttonCount + 1, 3));
	frame.add(makeScorePanel(), BorderLayout.NORTH);
	frame.setSize(Toolkit.getDefaultToolkit().getScreenSize().height,
	Toolkit.getDefaultToolkit().getScreenSize().width);
	frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
	/*
	* 13. Use the method provided to play the Jeopardy theme music
	*
	* 14. Add buttons so that you have $200, $400, $600, $800 and $1000
	* questions
	*
	* [optional] Use the showImage or playSound methods when the user answers a
	* question [optional] Add new topics for the quiz
	*/
	private JButton createButton(String dollarAmount) {
	// Create a new JButton
	JButton button = new JButton("");
	// Set the text of the button to the dollarAmount
	button.setText(dollarAmount);
	// Increment the buttonCount (this should make the layout vertical)
	buttonCount++;
	// Return your new button instead of the temporary button
	return button;
	}
	public void actionPerformed(ActionEvent arg0) {
	// Remove this temporary message:
	JOptionPane
	.showMessageDialog(null,
	"pressed " + ((JButton) arg0.getSource()).getText()
	+ " button");
	// Use the method that plays the jeopardy theme music.
	JButton buttonPressed = (JButton) arg0.getSource();
	// If the buttonPressed was the firstButton
	if (buttonPressed == firstButton) {
	askQuestion("How many dimensions are there?", "11", 100);
	}
	// Call the askQuestion() method
	// Fill in the askQuestion() method. When you play the game, the score
	// should change.
	// Or if the buttonPressed was the secondButton
	// Call the askQuestionRecipe with a harder question
	// Clear the button text (set the button text to nothing)
	}
	private void askQuestion(String question, String correctAnswer,
	int prizeMoney) {
	// Remove this temporary message
	JOptionPane.showMessageDialog(null,
	"this is where the question will be asked");
	// Use a pop up to ask the user the question
	// If the answer is correct
	// Increase the score by the prizeMoney
	// Call the updateScore() method
	// Pop up a message to tell the user they were correct
	// Otherwise
	// Decrement the score by the prizeMoney
	// Pop up a message to tell the user the correct answer
	// Call the updateScore() method
	}
	public void playJeopardyTheme() {
	try {
	AudioInputStream audioInputStream = AudioSystem
	.getAudioInputStream(new URL(
	"jeopardy.wav"));
	Clip clip = AudioSystem.getClip();
	clip.open(audioInputStream);
	clip.start();
	} catch (Exception ex) {
	ex.printStackTrace();
	}
	}
	private void playSound(String fileName) {
	AudioClip scream = JApplet.newAudioClip(getClass()
	.getResource(fileName));
	scream.play();
	}
	private Component makeScorePanel() {
	JPanel panel = new JPanel();
	panel.add(new JLabel("score:"));
	panel.add(scoreBox);
	panel.setBackground(Color.CYAN);
	return panel;
	}
	private void updateScore() {
	scoreBox.setText("" + score);
	}
	private JPanel createHeader(String topicName) {
	JPanel panelj = new JPanel();
	panelj.setLayout(new BoxLayout(panelj, BoxLayout.PAGE_AXIS));
	JLabel l1 = new JLabel(topicName);
	l1.setAlignmentX(Component.CENTER_ALIGNMENT);
	panelj.add(l1);
	return panelj;
	}
	void showCorrectImage() {
	showImage("correct.jpg");
	}
	void showIncorrectImage() {
	showImage("incorrect.jpg");
	}
	private void showImage(String fileName) {
	JFrame frame = new JFrame();
	URL imageURL = getClass().getResource(fileName);
	Icon icon = new ImageIcon(imageURL);
	JLabel image = new JLabel(icon);
	frame.add(image);
	frame.setVisible(true);
	frame.pack();
	}
	}