i get this error during compile

[Bibin]

cannot resolve symbol
symbol:class windowAdapter
location:class mydlg
addWindowListener(new windowAdapter()

(same error in line 11 and 46)
This is my code

import java.awt.*;
import java.awt.event.*;
public class dlgexp extends Frame implements ActionListener
{
	Button b1;
	public dlgexp()
	{
	setLayout(new FlowLayout());
	b1=new Button("Click");
	add(b1);
	addWindowListener(new windowAdapter()
	{
		public void windowClosing(WindowEvent we)
		{
			dispose();
		}
	});
	b1.addActionListener(this);
	}
	public void actionPerformed(ActionEvent ae)
	{
	if(ae.getSource()==b1)
	{
		mydlg dd=new mydlg(this,"Subwindow",false);
		dd.setSize(200,200);
		dd.setVisible(true);
	}
	}
	public static void main(String arg[])
	{
		dlgexp dd=new dlgexp();
		dd.setSize(300,300);
		dd.setVisible(true);
	}
}

class mydlg extends Dialog
{
	TextField f1;
	mydlg(Frame f,String t, boolean m)
	{
		super(f,t,m);
		setLayout(new FlowLayout());
		f1=new TextField(20);
		add(f1);
		addWindowListener(new windowAdapter()
		{
			public void windowClosing(WindowEvent we)
			{
				dispose();
			}
		});
	}
}

[JosAH]

The class name is 'WindowAdapter' (with a capital-W); Java is picky about the case of identifiers.

kind regards,

Jos