Java捕獲選項事件ItemEvent

Java捕獲選項事件ItemEvent：

1. package com.han;
3. import java.awt.Container;
4. import java.awt.FlowLayout;
5. import java.awt.event.ItemEvent;
6. import java.awt.event.ItemListener;
7. import java.util.Vector;
9. import javax.swing.DefaultComboBoxModel;
10. import javax.swing.JComboBox;
11. import javax.swing.JFrame;
13. /**
14. * 捕獲選項事件ItemEvent
15. * @author HAN
16. *
17. */
18. public class ItemEvent_1 extends JFrame {
20. /**
21. *
22. */
23. private static final long serialVersionUID = -9005090453541883935L;
25. public ItemEvent_1() {
26. // TODO Auto-generated constructor stub
27. Container container = getContentPane();
28. container.setLayout(new FlowLayout());
29. Vector<String> vector = new Vector<String>();
30. for (int i = 1; i<6; i++)
31. vector.add("選項" + i);
32. DefaultComboBoxModel<String> defaultComboBoxModel =
33. new DefaultComboBoxModel<String>(vector);
34. JComboBox<String> comboBox = new JComboBox<String>(defaultComboBoxModel);
35. container.add(comboBox);
36. comboBox.addItemListener(new ItemListener() {
38. @Override
39. public void itemStateChanged(ItemEvent e) {
40. // TODO Auto-generated method stub
41. String item = e.getItem().toString();
42. int stateChange = e.getStateChange();
43. if (stateChange == ItemEvent.SELECTED) {
44. System.out.println("此次事件由選中“" + item + "”觸發！");
45. }else if (stateChange == ItemEvent.DESELECTED) {
46. System.out.println("此次事件由取消選中“" + item + "”觸發！");
47. }else {
48. System.out.println("此次事件由其它原因觸發！");
49. }
50. }
52. });
53. }
55. /**
56. * @param args
57. */
58. public static void main(String[] args) {
59. // TODO Auto-generated method stub
60. ItemEvent_1 frame = new ItemEvent_1();
61. frame.setTitle("選項事件示例");
62. frame.setVisible(true);
63. frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
64. frame.setBounds(0, 0, 300, 100);
65. }
67. }