很简单的问题，请大家帮忙

最近学习JAVA 出现个问题import javax.swing.*;public class test
{
public static void main(String[] args)
{
String podstring =
JOptionPane.ShowInputDialog("Enter number of Pods:");
int numberofPods = Integer.parseInt(podstring); String peastring =
JOptionPane.ShowInputDialog("Enter number of Peas:");
int numberofPeas = Integer.parseInt(podstring); int totalnumberOfPeas = numberofPods * numberofPeas; JOptionPane.showMessadeDialog (
null,"The Total Numbers is :"+totalnumberOfPeas); System.exit(0);
}
}我用TextPad编译时 报错：
C:\j2sdk1.4.0_01\test\test.java:9: cannot resolve symbol
symbol  : method ShowInputDialog  (java.lang.String)
location: class javax.swing.JOptionPane
JOptionPane.ShowInputDialog("Enter number of Pods:");
                                           ^
C:\j2sdk1.4.0_01\test\test.java:13: cannot resolve symbol
symbol  : method ShowInputDialog  (java.lang.String)
location: class javax.swing.JOptionPane
JOptionPane.ShowInputDialog("Enter number of Peas:");
                                           ^
C:\j2sdk1.4.0_01\test\test.java:18: cannot resolve symbol
symbol  : method showMessadeDialog  (<*>,java.lang.String)
location: class javax.swing.JOptionPane
JOptionPane.showMessadeDialog (
                           ^
3 errorsTool completed with exit code 1初步怀疑是找不到swing包
但是我什么都安装好了啊，怎么会这样呢？ 达人教教我另外我的环境是设置好了的
CLASSPATH=.;C:\j2sdk1.4.0_01\lib\dt.jar;C:\j2sdk1.4.0_01\lib\tools.jar;
JAVA_HOME=C:\j2sdk1.4.0_01
PATH=%JAVA_HOME%\bin请大家帮忙解决下！ 不胜感激！