Java Programming

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

public class ChatClient implements ActionListener <--- Error "ActionListener cannot be resolved to type"
{
	private TextArea output;
	private TextField input;
	private Button sendButton;
	private Button quitButton;
	
	public ChatClient()
	{
		output = new TextArea(10,50);
		input = new TextField(50);
		sendButton = new Button("Send");
		quitButton = new Button("Quit");
	}
	
	public void launchFrame()
	{
		Frame f = new Frame("Chat Room");
		
		f.setLayout(new BorderLayout());
		f.add(output, BorderLayout.WEST);
		f.add(input, BorderLayout.SOUTH);
		
		Panel p = new Panel();
		p.setLayout(new GridLayout(2,1));
		p.add(sendButton);
		p.add(quitButton);
		
		f.add(p, BorderLayout.CENTER);
		
		f.pack();
		f.setVisible(true);
		
		f.addWindowListener(new WindowAdapter()	
		{
			public void windowClosing(WindowEvent we)
			{
				System.exit(0);
			}
		} );
		
		public void actionPerformed(ActionEvent ae) <--- error here
		{
			if (ae.getSource() == sendButton)
			{
				sendButton.setText("You Clicked me!"); <--- error here "The method setText(String) is undefined for type button
			}
		}
	}
	
	public static void main(String args[])
	{
		ChatClient cc = new ChatClient();
		cc.launchFrame();
	}
}{code}

I'm stumped and these books I have are apparently crap if they cannot teach me how to do events correctly. Anyways...

Help please!

Thanks!