一道作业题！
这样获取TextField的值对吗？可是最后还是显示不出来~！List 的值不会
小朋友一枚，求各位帮忙！谢谢！

1. import javax.microedition.midlet.MIDlet;
   
2. import javax.microedition.midlet.MIDletStateChangeException;
   
3. import javax.microedition.lcdui.*;
   
4. 
   
5. 
   
6. public class zouye extends MIDlet implements CommandListener{
   
7. private TextField tf1,tf2;
   
8. private Form mainForm1,mainForm2,mainForm;
   
9. private Command cm1,cm2,cm3,cm4;
   
10. private ChoiceGroup list;
    
11. 
    
12. public zouye() {
    
13. 
    
14. }
    
15. 
    
16. protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
    
17. 
    
18. 
    
19. }
    
20. 
    
21. protected void pauseApp() {
    
22. 
    
23. 
    
24. }
    
25. 
    
26. protected void startApp() throws MIDletStateChangeException {
    
27. Display display = Display.getDisplay(this);
    
28. 
    
29. tf1 = new TextField ("班级","",15,1);
    
30. tf2 = new TextField ("姓名","",15,1);
    
31. mainForm1 = new Form("请输入");
    
32. mainForm1.append(tf1);
    
33. mainForm1.append(tf2);
    
34. cm1 = new Command("下一页", Command.SCREEN, 1);
    
35. mainForm1.addCommand(cm1);
    
36. mainForm1.setCommandListener(this);
    
37. 
    
38. mainForm2 = new Form("请选择");
    
39. String [] stringArray = {"男","女"};
    
40. list = new ChoiceGroup("单选",Choice.EXCLUSIVE,stringArray,null);
    
41. cm2 = new Command("上一页", Command.SCREEN, 1);
    
42. cm3= new Command ("完成",Command.SCREEN,1);
    
43. mainForm2.append(list);
    
44. mainForm2.addCommand(cm2);
    
45. mainForm2.setCommandListener(this);
    
46. mainForm2.addCommand(cm3);
    
47. mainForm2.setCommandListener(this);
    
48. 
    
49. mainForm = new Form("显示");
    
50. cm4 = new Command ("退出",Command.EXIT ,1);
    
51. String a = tf1.getString();
    
52. String b = tf2.getString();
    
53. mainForm.append(a );
    
54. mainForm.append(b);
    
55. mainForm.addCommand(cm4);
    
56. mainForm.setCommandListener(this);
    
57. 
    
58. display.setCurrent(mainForm1);
    
59. 
    
60. 
    
61. }
    
62. 
    
63. public void commandAction(Command c, Displayable d) {
    
64. Display display = Display.getDisplay(this);
    
65. if (c == cm1){
    
66. display.setCurrent(mainForm2);
    
67. }        
    
68. if (c == cm2){
    
69. display.setCurrent(mainForm1);
    
70. }
    
71. if (c == cm3){
    
72. display.setCurrent(mainForm);
    
73. 
    
74. 
    
75. }
    
76. if (c == cm4){
    
77. try{
    
78. destroyApp(false);
    
79. }catch(MIDletStateChangeException exception){
    
80. System.out.println("MIDletStateChangeException");
    
81. }
    
82. notifyDestroyed();
    
83. }
    
84. 
    
85. }
    
86. 
    
87. }

复制代码

1. public void itemStateChanged(Item i) {
   
2. if (i ==tf1) {
   
3. String a = tf1.getString();
   
4. }
   
5. if (i == this.tf2) {
   
6. String  b = tf2.getString();
   
7. }
   
8. }

复制代码

第一先就着你的代码说吧~~你没有写Item组件变化监听方法，我上面给你写了~~~~
第二 最好把 字符串 a和b弄成全局变量
第三 你的代码结构很混乱 估计你是刚起步吧~~~多看看别人代码的格式~~培养一下你的编程思想