求救！！！！

[jiuzhangcs21dn]

package dbl1;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

public class SameTypeDemo extends JFrame{
JButton jb1,jb2,jb3;
public SameTypeDemo ()
{ Container contentPane=getContentPane();
contentPane.setLayout(null);
jb1= new JButton("Swing Button #1");
jb2= new JButton("Swing Button #2");
jb3= new JButton("Swing Button #3");
jb1.setBounds(85,25,150,65);
jb2.setBounds(100,65,150,65);
jb3.setBounds(115,105,150,65);
contentPane.add(jb1);
contentPane.add(jb2);
contentPane.add(jb3);

}
public static void main(String arg[]){
SameTypeDemo frmSameType=new SameTypeDemo();
frmSameType.setSize(new Dimension(400,300));
frmSameType.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e)
{ System.exit(0);
}
});
frmSameType.validate();
frmSameType.show();
}
}
错误信息：
E:\JBuilder8\jdk1.4\bin\javaw -classpath "E:\j2p\dbl1\class;E:\JBuilder8\jdk1.4\jre\lib\rt.jar;E:\JBuilder8\jdk1.4\jre\lib\i18n.jar;E:\JBuilder8\jdk1.4\jre\lib\sunrsasign.jar;E:\JBuilder8\jdk1.4\jre\lib\jsse.jar;E:\JBuilder8\jdk1.4\jre\lib\jce.jar;E:\JBuilder8\jdk1.4\jre\lib\charsets.jar;E:\JBuilder8\jdk1.4\jre\classes;E:\JBuilder8\jdk1.4\lib\tools.jar" dbl1.SameTypeDemo
java.lang.NoClassDefFoundError: dbl1/SameTypeDemo

Exception in thread "main"
非常感谢！！！！

[orant]

你的J2SE环境能用吗？

[jiuzhangcs21dn]

能啊！！
我想问一下，jbuilder8.0装完后，还用自己设置classpath等环境变量吗？
我机器里同时单独装了j2sdk1.4.2和jbuilder8.0是不是对juilder的运行环境有影响？
恳请指教！！！

[LuZhou]

SameTypeDemo.java/SameTypeDemo.class要放在dbl1目录中，因为dbl1是包。

[jiuzhangcs21dn]

thanks very very much!!!