Question

JavaFX Programming Assignment

Create a countdown timer with at least 3 text items to appear (minutes, seconds, and milliseconds). Start at 2 minutes. Code needed to add to a gaming program which needs to count down during each level. I've shown the general idea below.

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Answer 1

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This will Reset Your button to two minutes every time you pressed it and it will count backwards.

1. import java.awt.event.*;
2. import java.awt.*;
3. import javax.swing.*;
4. public class Stopwatch extends JFrame implements ActionListener, Runnable
5. {
6. private long startTime;
7. private final static java.text.SimpleDateFormat timerFormat = new java.text.SimpleDateFormat("MM : ss : SSS");
8. private final JButton startStopButton= new JButton("Start/stop");
9. private Thread updater;
10. private boolean isRunning= false;
11. private final Runnable displayUpdater= new Runnable()
12. {
13. public void run()
14. {
15. displayElapsedTime(Stopwatch.this.startTime - System.currentTimeMillis());
16. }
17. };
18. public void actionPerformed(ActionEvent ae)
19. {
20. if(isRunning)
21. {
22. long elapsed= startTime - System.currentTimeMillis() ;
23. isRunning= false;
24. try
25. {
26. updater.join();
27. // Wait for updater to finish
28. }
29. catch(InterruptedException ie) {}
30. displayElapsedTime(elapsed);
31. // Display the end-result
32. }
33. else
34. {
35. startTime= 2*60*1000+System.currentTimeMillis();
36. isRunning= true;
37. updater= new Thread(this);
38. updater.start();
39. }
40. }
41. private void displayElapsedTime(long elapsedTime)
42. {
43. startStopButton.setText(timerFormat.format(new java.util.Date(elapsedTime)));
44. }
45. public void run()
46. {
47. try
48. {
49. while(isRunning)
50. {
51. SwingUtilities.invokeAndWait(displayUpdater);
52. Thread.sleep(50);
53. }
54. }
55. catch(java.lang.reflect.InvocationTargetException ite)
56. {
57. ite.printStackTrace(System.err);
58. // Should never happen!
59. }
60. catch(InterruptedException ie) {}
61. // Ignore and return!
62. }
63. public Stopwatch()
64. {
65. startStopButton.addActionListener(this);
66. getContentPane().add(startStopButton);
67. setSize(100,50);
68. setVisible(true);
69. }
70. public static void main(String[] arg)
71. {
72. new Stopwatch().addWindowListener(new WindowAdapter()
73. {
74. public void windowClosing(WindowEvent e)
75. {
76. System.exit(0);
77. }
78. });
79. }
80. }