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

public class JFrameJButtonJLabelJTextField2 implements ActionListener, KeyListener
{
	public static void main(String[] args)
	{
		// Create a new instance of a JFrame; note that because the 'JFrame' class
		//  is not being extended, it IS necessary to create a 'JFrame' object here;
		//  note, also, that since a constructor is not being used, it is necessary
		//  to give the 'JFrame' object a name (instead of just creating a JFrame
		//  with "new JFrame()") and use that name throughout the 'main' method
		JFrame window = new JFrame();

		// Allow objects to be placed anywhere on the JFrame
		window.setLayout(null);

		// Don't let the JFrame be resized
		window.setResizable(false);

		// Allow the JFrame to be closed via the "X"; note that because the 'JFrame'
		//  class has not been extended, the "JFrame" prefix must be used here 
		window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		// Set the size, title, and background color of the JFrame
		window.setSize(400, 200);
		window.setTitle("Demo #2:  JFrame, JButton, JLabel, JTextField");
		window.getContentPane().setBackground(Color.BLACK);

		// Position the JFrame in the center of the screen
		window.setLocationRelativeTo(null);

		//=============================================================================//

		// Create and set up a JButton
		JButton button1 = new JButton("I am a Button!");
		button1.setFont(new Font("Arial", Font.BOLD, 20));
		button1.setBackground(Color.GREEN);
		button1.setForeground(Color.BLUE);
		button1.setSize(180, 30);
		button1.setLocation(110, 15);

		// Don't let the button be pressed via ENTER or SPACE
		button1.setFocusable(false);

		// Allow this JButton to respond to mouse clicks
		button1.addActionListener(new JFrameJButtonJLabelJTextField2());

		// Make the JButton visible and add it to the JFrame
		button1.setVisible(true);
		window.add(button1);

		//=============================================================================//

		// Create and set up a JLabel
		JLabel label1 = new JLabel("This is a Label.");
		label1.setSize(180, 30);
		label1.setLocation(110, 75);
		label1.setFont(new Font("Arial", Font.BOLD, 24));
		label1.setOpaque(true);
		label1.setBackground(Color.BLACK);
		label1.setForeground(Color.YELLOW);

		// Make the JLabel visible and add it to the JFrame		
		label1.setVisible(true);
		window.add(label1);

		//=============================================================================//

		// Create and set up a JTextField
		JTextField text1 = new JTextField(20);
		text1.setSize(180, 25);
		text1.setLocation(110, 135);
		text1.setFont(new Font("Arial", Font.BOLD, 16));
		text1.setBackground(Color.WHITE);
		text1.setForeground(Color.BLACK);
		text1.setHorizontalAlignment(JTextField.LEFT);

		// Allow this JTextField to respond to keypresses
		text1.addKeyListener(new JFrameJButtonJLabelJTextField2());

		// Make the JTextField visible and add it to the JFrame
		text1.setVisible(true);
		window.add(text1);

		//=============================================================================//

		// Make the JFrame (and everything on it) visible; note that this line
		//  is executed AFTER the above objects have been added to the JFrame
		//  to ensure that all of the above added objects appear on the JFrame 
		window.setVisible(true);
	}

	//================================================================================//

	// This method is called whenever the JButton is clicked
	public void actionPerformed(ActionEvent event)
	{
		System.out.println("The \"" + event.getActionCommand() + "\" button was clicked!");
	}

	//================================================================================//

	// Since 'KeyListener' is implemented, this method must exist to avoid errors
	public void keyPressed(KeyEvent event)
	{
	}

	// Since 'KeyListener' is implemented, this method must exist to avoid errors
	public void keyReleased(KeyEvent event)
	{
	}

	// This method is called whenever a key is pressed in the JTextField
	public void keyTyped(KeyEvent event)
	{
		System.out.println("You pressed the \"" + event.getKeyChar() + "\" key.");
	}
}