以下这段简单的程序为什么不能运行?

[microibm]

我用的是JDK1.3
以下这段程序,在用java命令运行时出现这样的错误(javac 命令正常):
Exception in thread "main" java.lang.NoClassDefFoundError:myframe

程序如下:
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

public class myframe extends JFrame
{
MyPane j;

myframe()
{
super("Swing Application");

Container contentpane=getContentPane();
j=new MyPane();
contentpane.add(j);

}

public static void main(String[] args)
{
final JFrame f=new myframe();
f.setBounds(100,100,300,300);
f.setVisible(true);
f.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
f.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
}

}


class MyPane extends JPanel
{
JTextField txtshow=new JTextField("Hello from swing!");
MyPane()
{
setBackground(Color.white);
add(txtshow);
}

public void paintComponent(Graphics g)
{
super.paintComponent(g);
g.drawString("Hello from swing!",0,60);
}

}

[refc]

查看文件名称和主类名称是否相同,myframe.java?

[GJA106]

运行成功！path或classpath路径问题搜索java论坛解决.