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

public class TextFieldTest
{
	public static void main(String[] args)
	{
		TextFrame frame = new TextFrame();
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.show();
	}
}

class TextFrame extends JFrame
{
	public TextFrame()
	{
		defaultPlaf = UIManager.getLookAndFeel();

		plafLabel = new JLabel("Look and Feel:");
		sizeLabel = new JLabel("Textfield Size:");
		resultLabel = new JLabel("Result Textfield:");

		button1 = new JRadioButton("Default");
		button2 = new JRadioButton("Metal");
		button3 = new JRadioButton("Motif");
		button4 = new JRadioButton("Windows");

		sizeText = new JTextField(2);
		resultText = new JTextField(textLength);

		changeButton = new JButton("Change");

		group = new ButtonGroup();

		plafPanel = new JPanel();
		sizePanel = new JPanel();
		resultPanel = new JPanel();

		group.add(button1);
		group.add(button2);
		group.add(button3);
		group.add(button4);

		plafPanel.add(plafLabel);
		plafPanel.add(button1);
		plafPanel.add(button2);
		plafPanel.add(button3);
		plafPanel.add(button4);

		sizePanel.add(sizeLabel);
		sizePanel.add(sizeText);
		sizePanel.add(changeButton);

		resultPanel.add(resultLabel);
		resultPanel.add(resultText);

		Container contentPane = getContentPane();
		contentPane.add(plafPanel, BorderLayout.NORTH);
		contentPane.add(sizePanel, BorderLayout.CENTER);
		contentPane.add(resultPanel, BorderLayout.SOUTH);

		changeButton.addActionListener(new
			ActionListener()
			{
				public void actionPerformed(ActionEvent e)
				{
					try
					{
						if(button2.isSelected())
							UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
						else if(button3.isSelected())
							UIManager.setLookAndFeel("com.sun.java.swing.plaf.motif.MotifLookAndFeel");
						else if(button4.isSelected())
							UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
						else
							UIManager.setLookAndFeel(defaultPlaf);
					}
					catch(Exception ex)
					{
						System.out.println("Exception occured at UIManager.setLookAndFeel() statement!");
					}
					SwingUtilities.updateComponentTreeUI(TextFrame.this);
					try
					{
						resultText.setColumns(Integer.parseInt(sizeText.getText().trim()));
					}
					catch(NumberFormatException ex)
					{
						new PopupFrame("Error!", "The size entered is not a paresable number!", TextFrame.this);
					}

				}
			});

			pack();
			Dimension screen = Toolkit.getDefaultToolkit().getScreenSize();
			setLocation((screen.width-getWidth())/2, (screen.height-getHeight())/2);
			setResizable(false);
			setTitle("TextFrame Test");

	}

	private JLabel plafLabel, sizeLabel, resultLabel;
	private JRadioButton button1, button2, button3, button4;
	private JTextField sizeText, resultText;
	private JButton changeButton;
	private ButtonGroup group;
	private JPanel plafPanel, sizePanel, resultPanel;

	private int textLength = 10;
	private LookAndFeel defaultPlaf;
}

class PopupFrame extends JFrame
{
	public PopupFrame(String title, String message, final JFrame frame)
	{
		frame.setEnabled(false);

		msgLabel = new JLabel(message, SwingConstants.CENTER);
		okButton = new JButton("Ok");
		okPanel = new JPanel();
		Container contentPane = getContentPane();

		okPanel.add(okButton);
		contentPane.add(msgLabel, BorderLayout.CENTER);
		contentPane.add(okPanel, BorderLayout.SOUTH);

		okButton.addActionListener(new
			ActionListener()
			{
				public void actionPerformed(ActionEvent e)
				{
					frame.setEnabled(true);
					PopupFrame.this.dispose();
				}
			});

		pack();
		Dimension screen = Toolkit.getDefaultToolkit().getScreenSize();
		setLocation((screen.width-getWidth())/2, (screen.height-getHeight())/2);
		setResizable(false);
		setTitle(title);
		show();
	}
	private JLabel msgLabel;
	private JButton okButton;
	private JPanel okPanel;
}