How to solve this problem"exception in thread "main" java.lang.noclassdeff"

Question

I am a tyro of java programming .
i downloaded the j2sdk-1_4_2_09-windows-i586-p.exe from www.java.sun.com and installed it at the defaulted path C:\j2sdk1.4.2_09,
then i wrote down my first java program as follow:
public class hello
public static void main (String args[])
System.out.println("hello,����!");
}and stored it at C:\Javasmp\ch01\hello.java.
after that i opened dos commind window and compiled it :
c:\javac C:\Javasmp\ch01\hello.java. and obtained file hello.class (C:\Javasmp\ch01\hello.class)
but when running it (c:\java C:\Javasmp\ch01\hello) there was a mistake:
exception in thread "main"java.lang.noclassdeffounderror:C:\Javasmp\ch01\hello
i searched on the internet and found out the solution is set enviroment viriable ,so i set the "CLASSPATH" as".;C:\j2sdk1.4.2_09\lib;C:\j2sdk1.4.2_09\lib\tools.jar" ,"PATH" as"C:\j2sdk1.4.2_09\bin;C:\Windows\system32;c:\windows\system32\Wbem" and "JAVA_HOME" as "C:\j2sdk1.4.2_09\bin;C:\j2sdk1.4.2_09\jre\bin"
afer that, i opened a new dos command window and run it again ,but the problem was still unsolved.
in addition,my os is "windows xp"
anyone can help me ,thank you!
i am a student in China,it's a hard time for me to write down my question in english ,i doubt whether i express my question clearly.
thank you for you reading.

Answer 1

I have created a simple applet.
import java.lang.*;
import java.awt.*;
public class jawtex3 extends java.applet.Applet
public void init()
add(new Button("One"));
add(new Button("Two"));
public Dimension preferredSize()
return new Dimension(200, 100);
public static void main(String [] args)
Frame f = new Frame(" jawtex3");
jawtex3 ex = new jawtex3();
ex.init();
f.add("Center", ex);
f.pack();
f.show();
In this no compilation errors.
I am getting runtime exception.as Exception in thread "main"java.lang.NoClassDefFound Error: jawtex
reply me soon.
thankyou.