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

public class TextView extends JPanel implements Observer { 
    /**
     * The Model (Account) we are observing
     */
    private Model model; 

    /**
     * Our widget that we need to remember
     */
    private JTextField textField;

    public TextView (Model model) {
	// Stash arg
	this.model = model; 

	// Sign us up as Observer
	model.addObserver (this); 

	// Set up our JPanel
	setBorder (new TitledBorder ("View"));

	// Label
	add (new JLabel ("Balance:"));

	// Text field to display amount
	textField = new JTextField (10);
	textField.setEditable (false);
	add (textField);

	// Force an initial update(), args are ignored anyway
	update (null, null);
    }

    /**
     * This will be called by our Model
     */
    public void update (Observable observable, Object object) { 
	textField.setText (String.valueOf (model.getBalance ())); 
    }
}