Thread: Error "TitleChanger is abstract; cannot be instantiated"

Hey, I'm fairly new to java, been reading sams teach yourself java 6 in 21 days.

I ran into an error with a code in the day 12 section.

import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
 
[COLOR="DarkRed"]public class TitleChanger extends JFrame implements ActionListener[/COLOR]
{
	JButton b1 = new JButton("Rosencrantz");
	JButton b2 = new JButton("Guildenstern");
 
	public TitleChanger()
	{
		super("Title Bar");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		b1.addActionListener(this);
		b2.addActionListener(this);
		FlowLayout flow = new FlowLayout();
		setLayout(flow);
		add(b1);
		add(b2);
		pack();
		setVisible(true);
	}
 
	public void actionPreformed(ActionEvent evt)
	{
		Object source = evt.getSource();
		if (source == b1)
		{
			setTitle("Rosencrantz");
		}
		else if (source == b2)
		{
			setTitle("Guildenstern");
		}
		repaint();
	}
 
	public static void main(String[] arguments)
	{
		TitleChanger frame = new TitleChanger();
	}
}

Now whenever i try to compile this, it will say that TitleChanger is not abstract and cannot override abstract method actionPreformed(java.awt.event.ActionEvent).

After i declare the main class as abstract however.

import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
 
public abstract class TitleChanger extends JFrame implements ActionListener
{
	JButton b1 = new JButton("Rosencrantz");
	JButton b2 = new JButton("Guildenstern");
 
	public TitleChanger()
	{
		super("Title Bar");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		b1.addActionListener(this);
		b2.addActionListener(this);
		FlowLayout flow = new FlowLayout();
		setLayout(flow);
		add(b1);
		add(b2);
		pack();
		setVisible(true);
	}
 
	public void actionPreformed(ActionEvent evt)
	{
		Object source = evt.getSource();
		if (source == b1)
		{
			setTitle("Rosencrantz");
		}
		else if (source == b2)
		{
			setTitle("Guildenstern");
		}
		repaint();
	}
 
	public static void main(String[] arguments)
	{
		[COLOR="DarkRed"]TitleChanger frame = new TitleChanger();[/COLOR]
	}
}

The compiler will say that TitleChanger is abstract; cannot be instantiated.
TitleChanger frame = new TitleChanger();

I am currently using Windows Vista, and was wondering if anyone might have a solution, or be able to point me to another source.

aight thanks