Prentice.Hall.Introduction.to.Java.Programming,.Brief.Version.9th.(2014).[sharethefiles.com]

6 private CircleModel model;
7 private JTextField jtfRadius = new JTextField();
8 private JComboBox jcboFilled = new JComboBox(new Boolean[]{
9 new Boolean(false), new Boolean(true)});
10
11 /** Creates new form CircleController */
12 public CircleController() {
13 // Panel to group labels
14 JPanel panel1 = new JPanel();
15 panel1.setLayout(new GridLayout(2, 1));
16 panel1.add(new JLabel("Radius"));
17 panel1.add(new JLabel("Filled"));
18
19 // Panel to group text field, combo box, and another panel
20 JPanel panel2 = new JPanel();
21 panel2.setLayout(new GridLayout(2, 1));
22 panel2.add(jtfRadius);
23 panel2.add(jcboFilled);
24
25 setLayout(new BorderLayout());
26 add(panel1, BorderLayout.WEST);
27 add(panel2, BorderLayout.CENTER);
28
29 // Register listeners
30 jtfRadius.addActionListener(new ActionListener() {
31 @Override
32 public void actionPerformed(ActionEvent e) {
33 if (model != null) // Set radius in the model
34 model.setRadius(Double.parseDouble(jtfRadius.getText()));
35 }
36 });
37 jcboFilled.addActionListener(new ActionListener() {
38 @Override
39 public void actionPerformed(ActionEvent e) {
40 if (model != null) // Set filled property value in the model
41 model.setFilled(((Boolean)jcboFilled.getSelectedItem()).
42 booleanValue());
43 }
44 });
45 }
46
47 public void setModel(CircleModel newModel) {
48 model = newModel;
49 }
50
51 public CircleModel getModel() {
52 return model;
53 }
54 }
Finally, let us create an applet named MVCDemo with two buttons,
Show Controller and Show View. The Show Controller button
displays a controller in a frame, and the Show View button
displays a view in a separate frame. The program is shown in
Listing 39.4.
Listing 39.4 MVCDemo.java
1 import java.awt.*;
7