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

public class ArraysOfGraphicalObjects extends JFrame implements ActionListener
{
	public static void main(String[] args)
	{
		new ArraysOfGraphicalObjects();
	}

	// Constructor
	public ArraysOfGraphicalObjects()
	{
		// Set up the JFrame that has been automatically created by the 'JFrame' class
		setLayout(null);
		setResizable(false);
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		setSize(335, 195);
		setTitle("Arrays of Graphical Objects");
		getContentPane().setBackground(Color.BLACK);
		setLocationRelativeTo(null);

		// Create an array of eight JButtons; note that in addition to JButtons, arrays
		//  can be created for all types of graphical objects
		JButton[] buttons = new JButton[8];

		for (int i = 0; i < 8; i++)
		{
			// Use the array element number (position) of each JButton in its caption
			buttons[i] = new JButton("I am JButton #" + (i + 1));

			// Use the array element positions of the JButtons to arrange the JButtons
			//  on the JFrame
			buttons[i].setLocation(10 + 160 * (i / 4), (i % 4) * 40 + 10);

			// If the 'setActionCommand' method has not been used, the 'getActionCommand'
			//  method will return the caption (text) of the JButton; to make for easier
			//  identification and processing of the buttons when they are clicked, the
			//  'setActionCommand' method is used here to set the text of each button to
			//  its element position (plus one) in the array of JButtons
			buttons[i].setActionCommand(Integer.toString(i + 1));

			buttons[i].setSize(150, 30);
			buttons[i].setFocusable(false);
			buttons[i].addActionListener(this);
			buttons[i].setVisible(true);
			add(buttons[i]);
		}

		setVisible(true);
	}

	public void actionPerformed(ActionEvent event)
	{
		System.out.println(event.getActionCommand());
	}
}