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  1. package cc.ptt;
  2.  
  3. import java.awt.BorderLayout;
  4. import java.awt.event.ActionEvent;
  5. import java.awt.event.ActionListener;
  6.  
  7. import javax.swing.BorderFactory;
  8. import javax.swing.JButton;
  9. import javax.swing.JFrame;
  10. import javax.swing.JLabel;
  11. import javax.swing.SwingUtilities;
  12.  
  13. public class CountDownDemo {
  14.     public static void main(String[] args) {
  15. 		JFrame frm = new JFrame("Demo for Java@ptt");
  16. 		frm.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
  17.  
  18. 		final JLabel messageBar = new JLabel("", JLabel.CENTER);
  19. 		messageBar.setBorder(BorderFactory.createLoweredBevelBorder());
  20. 		messageBar.setFont(messageBar.getFont().deriveFont(48f));
  21. 		frm.getContentPane().add(messageBar);
  22.  
  23. 		final JButton start = new JButton("開始倒數 10 秒");
  24. 		frm.getContentPane().add(start, BorderLayout.SOUTH);
  25. 		final CountDown counter = new CountDown();
  26. 		counter.setTickListener(new CountDown.OnTickListener() {
  27. 			@Override
  28. 			public void onTick(int seconds) {
  29. 				// setText method is thread-safe
  30. 				messageBar.setText(String.format("%d 秒", seconds));
  31. 				if (seconds <= 0) {
  32. 					SwingUtilities.invokeLater(new Runnable() {
  33. 						public void run() {
  34. 							start.setEnabled(true);
  35. 						}
  36. 					});
  37. 				}
  38. 			}
  39. 		});
  40. 		start.addActionListener(new ActionListener() {
  41. 			@Override
  42. 			public void actionPerformed(ActionEvent e) {
  43. 				start.setEnabled(false);
  44. 				counter.asyncStart(10);
  45. //				counter.syncStart(10);
  46. 			}
  47. 		});
  48.  
  49. 		frm.setSize(400, 400);
  50. 		frm.setLocationRelativeTo(null);
  51. 		frm.setVisible(true);
  52. 	}
  53. }
  54.  
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https://ideone.com/VEY1io
language:
Java (HotSpot 12)
created:
13 years ago
visibility:
secret

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