1. 
   
2. <DIV class=blockcode>
   
3. <BLOCKQUOTE>
   
4. <BLOCKQUOTE>

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1. 
   
2. <P><package day4;
   
3. 
   
4. import java.awt.BorderLayout;
   
5. import java.awt.Container;
   
6. import java.awt.EventQueue;
   
7. import java.awt.FlowLayout;
   
8. import java.awt.event.KeyAdapter;
   
9. import java.awt.event.KeyEvent;
   
10. import java.awt.event.KeyListener;
    
11. 
    
12. import javax.swing.JFrame;
    
13. import javax.swing.JLabel;
    
14. import javax.swing.JPanel;
    
15. import javax.swing.JTextField;
    
16. 
    
17. public class KeyEventDemo extends JFrame {
    
18. 
    
19. public static void main(String[] args) {
    
20. EventQueue.invokeLater(new Runnable(){//采用事件队列的方式启动线程
    
21. 
    
22. @Override
    
23. public void run() {
    
24. KeyEventDemo frame=new KeyEventDemo();
    
25. }
    
26. });
    
27. }
    
28. //抽取窗口中的成员
    
29. private JLabel label=new JLabel("请回答下面的数学题计算结果");
    
30. private JLabel labelnum_1;
    
31. private JLabel labelnum_2;
    
32. private JLabel label_1;
    
33. private JLabel label_2;
    
34. private JTextField resultText;
    
35. private JPanel panel;
    
36. private JLabel showText;
    
37. private int n1=50;
    
38. private int n2=30;
    
39. 
    
40. //在构造方法中设置窗体的各个组件
    
41. public KeyEventDemo(){
    
42. super();
    
43. setBounds(100,100,500,400);
    
44. setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    
45. Container container=getContentPane();
    
46. 
    
47. container.setLayout(new BorderLayout());
    
48. 
    
49. panel=new JPanel(new FlowLayout(FlowLayout.CENTER));
    
50. 
    
51. 
    
52. labelnum_1=new JLabel();
    
53. labelnum_2=new JLabel();
    
54. labelnum_1.setText(n1+"");
    
55. labelnum_2.setText(n2+"");
    
56. label_1=new JLabel("+");
    
57. label_2=new JLabel("=");
    
58. resultText=new JTextField("0",10);
    
59. showText=new JLabel("这里显示提示信息");
    
60. 
    
61. panel.add(labelnum_1);
    
62. panel.add(label_1);
    
63. panel.add(labelnum_2);
    
64. panel.add(label_2);
    
65. panel.add(resultText);
    
66. 
    
67. container.add(label,BorderLayout.NORTH);
    
68. container.add(panel,BorderLayout.CENTER);
    
69. container.add(showText,BorderLayout.SOUTH);</P>
    
70. <P>//添加事件监听
    
71. resultText.addKeyListener(new KeyAdapter(){
    
72. 
    
73. public void keyPressed(KeyEvent e) {
    
74. do_result_keyPressed(e);     //事件处理方法向外抽取
    
75. }
    
76. 
    
77. });
    
78. 
    
79. 
    
80. setVisible(true);
    
81. }
    
82. 
    
83. protected void do_result_keyPressed(KeyEvent e) {
    
84. if (e.getKeyCode()==KeyEvent.VK_ENTER){
    
85. String result=resultText.getText();
    
86. int resultSum=0;
    
87. try {
    
88. resultSum = Integer.parseInt(result);
    
89. } catch (Exception e2) {
    
90. showText.setText("");
    
91. showText.setText("结果只能为数字，不能包含字母");
    
92. resultText.selectAll();
    
93. return ;                           //发生异常处理过后要返回继续向下执行.
    
94. }
    
95. 
    
96. if (resultSum==n1+n2){
    
97. showText.setText("");
    
98. showText.setText("回答正确");
    
99. randomNumber();
    
100. resultText.selectAll();
     
101. 
     
102. }else{
     
103. showText.setText("");
     
104. showText.setText("回答错误，请重新回答。");
     
105. resultText.selectAll();
     
106. }
     
107. }
     
108. }
     
109. 
     
110. private void randomNumber() {
     
111. n1=(int)(Math.random()*100+1);
     
112. n2=(int)(Math.random()*100+1);
     
113. System.out.println(n1+"::::::::"+n2);
     
114. labelnum_1.setText(n1+"");
     
115. labelnum_2.setText(n2+"");
     
116. }
     
117. 
     
118. }
     
119. ></P>

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亲，如问题已解决请将分类的“未解决”改为“已解决”。
以后的问题贴也要及时更改分类哦~