上面我刚发过一个关于RandomAccessFile的问题　很感谢斑竹的详细解答．．解开了我很多迷惑的地方．没想到这里好心人有那么多～！

下面这个典型的问题　是我在国外网站上找到的　只不过这个习题也没有给出详细的答案．

问题如下：

Write an application that allows a user to choose insurance options in Checkboxes．Use CheckboxGroup to allow the user to select only one of two insurance types--HMO(health maintenance organization) or PPO(preferred provider organization)[两种不同形式的保险]. Use regular(single)Checkbox for dental insurance and vision insurance options［另外的两种］:the user can select one option, both options, or neither option. As the user selects each option,display［显示］ its name and price in a text field; the HMO cost $200, the PPO cost $600 per month, the dental coverage adds $75 per month, and the vision care adds $20 per month. When the user deselects［取消］ an item, make the text field blank. Save the program as Insurance.java.

不知道咱们论坛的哪位朋友　有兴趣试着写写解题过程．．．我想刚开始接触j2se的朋友　都需要这样实际的例子帮助学习．．呵呵～

到底CheckboxGroup与Checkbox区别在哪呢？

都睡觉啦嘛～～晚安哈

这个问题不是典型问题吗？怎么没人愿意去解答呢？呵呵．．．．

一直在找在看．．可是还不太理解．．是不是我太笨了？

懂的朋友帮看看．．．现在可以正常运行了　但是达不到我想要的目的．．一共有两种保险　那么选择第１种　弹出价格为７５　这个正常　那么我再选上第２个　弹出的价格却不是第２个和头一个的总和　还只是第２个自身的价格．．．

我想要实现的是　点第一个价格是７５　再点第２个　价格为７５＋２０＝９５　再取消掉第一个　价格变为２０　或者取消掉第二个　价格变化为７５　最后取消掉剩下那个　价格变成０

好心的朋友帮我写写思路吧　我还在琢磨！
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class CheckboxGroupFile extends JFrame{
private JLabel messageLabel;
private JCheckBox HMO;
private JCheckBox PPO;
private JCheckBox dental;
private JCheckBox vision;
private final int WINDOW_WIDTH=300;
private final int WINDOW_HEIGHT=250;
private int HMOInsurance=200;
private int PPOInsurance=600;
private int dentalInsurance=75;
private int visionInsurance=20;
public CheckboxGroupFile()
{
setTitle("Insurance Check Box");
setSize(WINDOW_WIDTH,WINDOW_HEIGHT);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
messageLabel = new JLabel("Select the check " +
"boxes to change insurance.");
HMO=new JCheckBox("HMO insruance");
PPO=new JCheckBox("PPO insurance");
dental=new JCheckBox("dental insurance");
vision=new JCheckBox("vision insurance");

HMO.addItemListener(new CheckBoxListener());
PPO.addItemListener(new CheckBoxListener());
dental.addItemListener(new CheckBoxListener());
vision.addItemListener(new CheckBoxListener());

setLayout(new FlowLayout());

add(HMO);
add(PPO);
add(dental);
add(vision);

setVisible(true);}

private class CheckBoxListener implements ItemListener
{
public void itemStateChanged(ItemEvent e)
{
if (e.getSource() ==dental && e.getSource() == vision)
{
JOptionPane.showMessageDialog(null,"1");
}
else
{if (e.getSource() == dental)
{if (dental.isSelected())
{
JOptionPane.showMessageDialog(null,"The name is:dental"+"The price is:"+dentalInsurance);
}
}
if (e.getSource() == vision)
{if (vision.isSelected())
{
JOptionPane.showMessageDialog(null,"The name is:vision"+"The price is:"+visionInsurance);
}
}
}

}
}
}

[此贴子已经被作者于2007-3-30 17:11:36编辑过]

谢谢朋友　这个错误　我已经修改掉了．．．

[此贴子已经被作者于2007-3-30 17:13:59编辑过]

你长的这是嘴？你妈刚生你下来，你就会跑了？看把你猖狂的．什么东西不是一点点学习一点点积累的？你帮助新人的方式就是这样？我不想骂你．．