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

public class DetectMouseClickOnImageWithJFrame extends JFrame
{
	// Create an ArrayList of JLabels; each JLabel will contain an ImageIcon of an
	//  "apple", since (unlike an Image) an ImageIcon can be assigned to a JLabel;
	//  each JLabel will also be assigned a MouseListener, since a MouseListener
	//  cannot be assigned directly to an ImageIcon (or an Image)
	private ArrayList<JLabel> apples = new ArrayList<JLabel>();

	// Create ArrayLists containing the coordinates of the "apples" (JLabels)
	private ArrayList<Integer> applesX = new ArrayList<Integer>();
	private ArrayList<Integer> applesY = new ArrayList<Integer>();

	private ImageIcon apple = new ImageIcon("data_files/apple.png");

	public static void main(String[] args)
	{
		new DetectMouseClickOnImageWithJFrame();
	}

	// Constructor
	public DetectMouseClickOnImageWithJFrame()
	{
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setSize(400, 250);
		setTitle("Detecting a Mouse Click on an Image on a JFrame");
		setLocationRelativeTo(null);
		setResizable(false);
		setVisible(true);
		setFocusable(true);
		addMouseListener(new InnerMouseListener());

		// Add three "apple" images to the ArrayList by creating JLabels, assigning an
		//  "apple" ImageIcon to each JLabel, and adding MouseListeners to the JLabels
		for (int i = 0; i < 3; i++)
		{
			apples.add(new JLabel());
			apples.get(i).setIcon(apple);
			apples.get(i).addMouseListener(new InnerMouseListener());
		}
		repaint();

		// Set the 'X' and 'Y' coordinates for the three "apple" images (JLabels)
		applesX.add(20);
		applesY.add(72);

		applesX.add(179);
		applesY.add(212);

		applesX.add(335);
		applesY.add(117);
	}

	public void paint(Graphics g)
	{
		// Draw the JFrame background
		g.setColor(Color.BLACK);
		g.fillRect(0, 0, 400, 250);

		// Draw the "apple" images at the 'X' and 'Y' coordinates specified above
		for (int i = 0; i < apples.size(); i++)
			g.drawImage(apple.getImage(), applesX.get(i), applesY.get(i), this);
	}

	// Creating an inner class that extends the 'MouseAdapter' class allows the
	//  'mouseClicked' method to be used without having to implement the four
	//  remaining (unused) methods of the MouseListener interface
	public class InnerMouseListener extends MouseAdapter
	{
		public void mouseClicked(MouseEvent event)
		{
			// Run through the elements of the 'apples' ArrayList to see if one of the
			//  "apple" images (JLabels) has been clicked
			for (int i = 0; i < apples.size(); i++)
			{
				// Create a "rectangle" around each JLabel in the ArrayList
				Rectangle rApple = new Rectangle(applesX.get(i), applesY.get(i),
							 apple.getImage().getWidth(null), apple.getImage().getHeight(null));

				// See if the coordinates where the mouse was clicked are within the
				//  "rectangle" that was created around the "apple" image (JLabel)
				if (rApple.contains(event.getX(), event.getY()))
					System.out.println("The mouse was clicked on apple #" + (i + 1) + ".");
			}
		}
	}
}