JAVA中對同一問題分別使用內部類與匿名內部類實現

JAVA中對同一問題分別使用內部類與匿名內部類實現，基於輕量級組件Swing中JComboBox組件來舉例說明，希望能夠有助於深入理解內部類與匿名內部類的區別以及其使用。

1. package com.han;
2. import javax.swing.*;
4. import java.awt.*;
5. import java.awt.event.*;
7. /**
8. * 設計了一個Swing窗體，其中包括了JComboBox組件(下拉列表框)，
9. * 在下面的代碼中運用了內部類的手段。
10. * @author HAN
11. *
12. */
13. @SuppressWarnings("serial")
14. public class SwingJComboBox extends JFrame{
16. public SwingJComboBox(){
17. setLayout(null);
18. setBounds(130,30,300,200);
19. Container c=getContentPane();
20. final MyComboBox obj1=new MyComboBox();
21. @SuppressWarnings({ "unchecked", "rawtypes" })
22. JComboBox jc=new JComboBox(obj1);
23. jc.setBounds(0,0,290,20);
24. // System.out.println(obj1.getElementAt(0));
25. jc.addActionListener(new ActionListener(){
26. public void actionPerformed(ActionEvent arg0){
27. System.out.println(obj1.getSelectedItem());
28. }
29. });
30. JCheckBox jck1=new JCheckBox("男");
31. JCheckBox jck2=new JCheckBox("女",true);
32. jck1.setBounds(100,80,40,20);
33. jck2.setBounds(140,80,40,20);
34. JButton jb1=new JButton("確定");
35. JButton jb2=new JButton("取消");
36. jb1.setBounds(80,130,60,30);
37. jb2.setBounds(140,130,60,30);
38. c.add(jc);
39. c.add(jck1);
40. c.add(jck2);
41. c.add(jb1);
42. c.add(jb2);
43. setVisible(true);
44. setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); //very important !!
45. }
47. @SuppressWarnings("rawtypes")
48. class MyComboBox extends AbstractListModel implements ComboBoxModel {
49. String selecteditem="軍人證";
50. String[] test={"身份證","軍人證","學生證"};
51. public void setSelectedItem(Object item){
52. selecteditem=(String)item;
53. }
54. public Object getSelectedItem(){
55. return selecteditem;
56. }
57. @Override
58. public int getSize() {
59. // TODO Auto-generated method stub
60. return test.length;
61. }
62. @Override
63. public Object getElementAt(int index) {
64. // TODO Auto-generated method stub
65. return test[index];
66. }
68. }
70. public static void main(String[] args){
71. new SwingJComboBox();
73. }
74. }

1. package com.han;
2. import javax.swing.*;
3. import javax.swing.event.ListDataListener;
5. import java.awt.*;
6. import java.awt.event.*;
8. /**
9. * 設計了一個Swing窗體，其中包括了JComboBox組件(下拉列表框)，
10. * 在下面的代碼中運用了匿名內部類的手段。
11. * @author HAN
12. *
13. */
14. @SuppressWarnings("serial")
15. public class SwingJComboBox extends JFrame{
16. public static String selectedItem;
17. public SwingJComboBox(){
18. setLayout(null);
19. setBounds(130,30,300,200);
20. Container c=getContentPane();
21. // final MyComboBox obj1=new MyComboBox();
22. @SuppressWarnings({ "unchecked", "rawtypes" })
23. JComboBox jc=new JComboBox(new ComboBoxModel(){
24. String selecteditem="軍人證";
25. String[] test={"身份證","軍人證","學生證"};
26. // public void getItem(){
27. // selectedItem=selecteditem;
28. // }
29. @Override
30. public int getSize() {
31. // TODO Auto-generated method stub
32. return test.length;
33. }
35. @Override
36. public Object getElementAt(int index) {
37. // TODO Auto-generated method stub
38. return test[index];
39. }
41. @Override
42. public void setSelectedItem(Object anItem) {
43. // TODO Auto-generated method stub
44. selecteditem=(String) anItem;
45. }
47. @Override
48. public Object getSelectedItem() {
49. // TODO Auto-generated method stub
50. // getItem();
51. selectedItem=selecteditem;
52. return selecteditem;
53. }
55. @Override
56. public void addListDataListener(ListDataListener l) {
57. // TODO Auto-generated method stub
59. }
61. @Override
62. public void removeListDataListener(ListDataListener l) {
63. // TODO Auto-generated method stub
65. }
67. });
68. jc.setBounds(0,0,290,20);
69. // System.out.println(obj1.getElementAt(0));
70. jc.addActionListener(new ActionListener(){
71. public void actionPerformed(ActionEvent arg0){
72. System.out.println(selectedItem);
73. }
74. });
75. JCheckBox jck1=new JCheckBox("男");
76. JCheckBox jck2=new JCheckBox("女",true);
77. jck1.setBounds(100,80,40,20);
78. jck2.setBounds(140,80,40,20);
79. JButton jb1=new JButton("確定");
80. JButton jb2=new JButton("取消");
81. jb1.setBounds(80,130,60,30);
82. jb2.setBounds(140,130,60,30);
83. c.add(jc);
84. c.add(jck1);
85. c.add(jck2);
86. c.add(jb1);
87. c.add(jb2);
88. setVisible(true);
89. setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); //very important !!
90. }
93. public static void main(String[] args){
94. new SwingJComboBox();
96. }
97. }