// the view displays a button and a text field;
// it listens to the button and is a listener for model changes 

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

// implementing the Semantics 
class View extends Layout implements IModelListener, ActionListener {

    IViewListener listener; 

    View() {
	super(); 
	but.addActionListener(this); 
    }

    // update the label
    public void notifyListener(int c) {
	lab.setText(new Integer(c).toString()); 
    }

    // -------------------------------------------
    // add listener to View 
    public void register(IViewListener vl) {
	listener = vl; 
    }

    // inform the listener of an event 
    public void actionPerformed(ActionEvent e) {
	listener.notifyListener(); 
    }
}