Help me with this (I am new to java)

I am completely new to java, and programming all together, for that matter. I am trying to make a java program that will add 2 numbers that I have input (I don't even know what to put so I can input a number, but oh well).
I put together the following program, but I got an error when trying to run it, and don't know what the error means or why.
Program:
class addition
public static void main (String[] args)
int result = 1+2;
System.out.println(result);
Error:
----jGRASP exec: java add
java.lang.NoClassDefFoundError: add
Exception in thread "main"
----jGRASP wedge2: exit code for process is 1.
----jGRASP: operation complete.

Also, what does this mean:
java.lang.NoClassDefFoundErrorTranslated : No Class Definition Found Error. It means you haven't defined a class called "add". You defined a class called "addition". Being this said, I repeat the question, when you are called by another name than yours, do you respond?
I get that all the time when compiling.when compiling or trying to running it? (diferent concepts)
Message was edited by:
Ruly-o_O

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    �     � Can display amount payable          
    �     � Can indicate availability of drink (with error checking)          
    �     � Can accept payment for drink (with error checking)          
    �     � Can dispense drink          
    �     � Can update stock          
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