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1 package chapter1;
2
3 import java.awt.*;
4 import java.awt.event.*;
5
6 public class AWTDemo extends Frame implements ActionListener{
7 int x = 100;
8 int y = 100;
9
10 public static void main(String[] args) {
11 Frame frame = new AWTDemo();
12 frame.setSize(640, 480);
13 frame.setVisible(true);
14 }
15
16 public AWTDemo() {
17 setTitle("AWT Demo");
18 // create menu
19 MenuBar mb = new MenuBar();
[Page 18]20 setMenuBar(mb);
21 Menu menu = new Menu("File");
22 mb.add(menu);
23 MenuItem mi = new MenuItem("Exit");
24 mi.addActionListener(this);
25 menu.add(mi);
26 // end program when window is closed
27 WindowListener l = new WindowAdapter() {
28 public void windowClosing(WindowEvent ev) {
29 System.exit(0);
30 }
31 };
32 this.addWindowListener(l);
33 // mouse event handler
34 MouseListener mouseListener = new MouseAdapter() {
35 public void mouseClicked(MouseEvent ev) {
36 x = ev.getX();
37 y = ev.getY();
38 repaint();
39 }
40 };
41 addMouseListener(mouseListener);
42 }
43
44 public void paint(Graphics g) {
45 g.drawOval(x-50, y-50, 100, 100);
46 }
47
48 public void actionPerformed(ActionEvent ev) {
49 String command = ev.getActionCommand();
50 if ("Exit".equals(command)) {
51 System.exit(0);
52 }
53 }
54 }