Mengubah ukuran font dengan JSlider

frameTextSlider.java

import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.UIManager;
import javax.swing.border.EmptyBorder;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.event.*;
import java.awt.Font;
import javax.swing.JLabel;
import javax.swing.ImageIcon;
import java.awt.Color;

@SuppressWarnings("serial")
public class frameTextSlider extends JFrame 
{
	private JPanel contentPane;
	private JScrollPane scrollPane;
	private JTextArea textArea;
	private JSlider slider;
	private JLabel lblFontMax;
	private JLabel lblTulis;
	private JLabel lblWall;
	private JLabel lblIcon;

	/**
	 * Create the frame.
	 */
	public frameTextSlider() 
	{
		setTitle("Font Size");
		setResizable(false);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 564, 365);
		contentPane = new JPanel();
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);
		contentPane.setLayout(null);
		
		scrollPane = new JScrollPane();
		scrollPane.setBounds(12, 103, 309, 120);
		contentPane.add(scrollPane);
		
		textArea = new JTextArea();
		scrollPane.setViewportView(textArea);
		textArea.setFont(new Font("Comic Sans MS", Font.BOLD, 12));
		
		textArea.setWrapStyleWord(true);
		textArea.setLineWrap(true);
		
		slider = new JSlider(1,150);
		slider.setValue(15);
		slider.setBounds(76, 235, 200, 16);
		contentPane.add(slider);
		
		lblFontMax = new JLabel("Maximize / Minimize Font");
		lblFontMax.setFont(new Font("Comic Sans MS", Font.BOLD, 14));
		lblFontMax.setForeground(new Color(255, 255, 255));
		lblFontMax.setBounds(86, 263, 190, 15);
		contentPane.add(lblFontMax);
		
		lblTulis = new JLabel("Tulis text disini");
		lblTulis.setFont(new Font("Comic Sans MS", Font.BOLD, 14));
		lblTulis.setForeground(new Color(255, 255, 255));
		lblTulis.setBounds(101, 76, 114, 15);
		contentPane.add(lblTulis);
		
		lblIcon = new JLabel("");
		lblIcon.setIcon(new ImageIcon("/home/resa/Aplikasi Java/SwingJava/src/textSlider/icon.png"));
		lblIcon.setBounds(388, 103, 128, 120);
		contentPane.add(lblIcon);
		
		lblWall = new JLabel("");
		lblWall.setIcon(new ImageIcon("/home/resa/Aplikasi Java/SwingJava/src/textSlider/wall.jpg"));
		lblWall.setBounds(0, -12, 568, 348);
		contentPane.add(lblWall);
		
		slider.addChangeListener(new ChangeListener()
		{

			@Override
			public void stateChanged(ChangeEvent ce) {
				// TODO Auto-generated method stub
				textArea.setFont(new Font("Comic Sans MS", Font.BOLD, slider.getValue()));
			}
			
		});
		
		setLocationRelativeTo(null);
	}
	
	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try 
				{
					UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
					frameTextSlider frame = new frameTextSlider();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}
}