import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JSlider;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

/**
 * 
 */

/**
 * @author barbaralerner
 *
 */
public class Hello {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		JFrame frame = new JFrame();
		Container contentPane = frame.getContentPane();
		final JLabel l = new JLabel("Hello");
		contentPane.add(l, BorderLayout.CENTER);
		
		JButton b = new JButton ("Click me!");
		contentPane.add(b, BorderLayout.SOUTH);
		b.addActionListener (new ActionListener() {
			int counter = 0;

			public void actionPerformed(ActionEvent arg0) {
				counter++;
				l.setText("" + counter);
			}
			
		});
		
		final JSlider sizeSlider = new JSlider(JSlider.HORIZONTAL);
		contentPane.add (sizeSlider, BorderLayout.NORTH);
		sizeSlider.addChangeListener(new ChangeListener() {

			public void stateChanged(ChangeEvent arg0) {
				l.setFont(l.getFont().deriveFont((float) sizeSlider.getValue()));				
			}
			
		});
		
		frame.setSize(new Dimension (200, 200));
		frame.setVisible(true);
	}

}