Note the key statement below that connects this view to the model.

abstract class TemperatureGUI implements java.util.Observer
{ TemperatureGUI(String label, TemperatureModel model, int h, int v)
{ this.label = label;
this.model = model;
temperatureFrame = new Frame(label);
temperatureFrame.add("North", new Label(label));
temperatureFrame.add("Center", display);
Panel buttons = new Panel();
buttons.add(upButton);
buttons.add(downButton);
temperatureFrame.add("South", buttons);
temperatureFrame.addWindowListener(new CloseListener());
model.addObserver(this); // Connect the View to the Model
temperatureFrame.setSize(200,100);
temperatureFrame.setLocation(h, v);
temperatureFrame.setVisible(true);
}

public void setDisplay(String s){ display.setText(s);}

public double getDisplay()
{ double result = 0.0;
try
{ result = Double.valueOf(display.getText()).doubleValue();
}
catch (NumberFormatException e){}
return result;
}

public void addDisplayListener(ActionListener a){ display.addActionListener(a);}
public void addUpListener(ActionListener a){ upButton.addActionListener(a);}
public void addDownListener(ActionListener a){ downButton.addActionListener(a);}

protected TemperatureModel model(){return model;}

private String label;
private TemperatureModel model;
private Frame temperatureFrame;
private TextField display = new TextField();
private Button upButton = new Button("Raise");
private Button downButton = new Button("Lower");

public static class CloseListener extends WindowAdapter
{ public void windowClosing(WindowEvent e)
{ e.getWindow().setVisible(false);
System.exit(0);
}
}
}

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Thanks & Regards,
Jegan CBK
"We will either find a way, or make one!”