import java.awt.*;
import java.awt.event.*;
class AwtF extends Frame {
    public static void main(String[] arg) {
        new AwtF();
    }
    TextField t;
    AwtF() {
        addWindowListener(new WindowAdapterF());
        setVisible(true);
        t = new TextField(40);
        add("North", t);
        Button b = new Button("Clear");
        add("South", b);
        b.addActionListener(new ActionListenerF());
        pack();
    }
    class ActionListenerF implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            t.setText("");  
        }
    }
}
class WindowAdapterF extends WindowAdapter {
    public void windowClosing(WindowEvent e) {
    	System.exit(0);
    }
}

// inner class
// I am within the scope of "t", so I can access "t" directly