why I get error while trying to run a class in a package

[newlifeseattle]

I have created two classes in a package:
1)class MyMaths
package mytest;

public class MyMaths {


public static int add(int op1, int op2)
{
return (op1+op2);
}

}
2) class MathTest
package mytest;
import junit.framework.*;

public class MathTest extends TestCase {


public MathTest(String string) {
// TODO Auto-generated constructor stub
super(string);
}

public static void testAdd()
{
int a=3;
int b=4;
int sum=a+b;
int total=MyMaths.add(a,b);
assertEquals(sum,total);
}

public static void main(String[] args)
{
System.out.println("hello");
//TestCase test= new MathTest("testAdd");
//test.run();


}

}


these two classes are put in my test folder. I did the following:
1) cd c:\mytest
2) javac *.java
3) java mytest.MathTest
it gives me error saying:
NOClassDeffoundError: mytest\MathTest

I did the following steps:
4)cd .. (get outside of mytest)
5) java mytest.MathTest
again it is Classnotfound but this time the error message is different:
NOClassDefFOund:junit.framework.TestCase

my Question:
1) why I have two different errors when I run the command from different directory?
2) how to successful run the class?

thanks!

[curmudgeon]

Your second attempt, while unsuccessful, appears more successful than the first seeing as Java "found" the classes, but didn't find the junit.framework.TestCase class.

Question: you don't appear to be setting the classpath when you compile or run your programs, and this may be why Java cannot find the junit.framework.TestClass class. There is a switch for setting the classpath when compiling and running programs and the Sun Java tutorials can tell you all about it.

[newlifeseattle]

thanks Curmudgeon.

my classpath is as below:
c:\program files\java\jdk1.6.0_20\lib\*.jar;.;c:\program files\java\jdk1.6.0_20\lib;d:\JavaCode\test\;d:\Ja vaCode\JunitSeleniumTest\src\test
where junit jar is under c:\program files\java\jdk1.6.0_20\lib\

I'll check the sun java tutorial to find out how to set up the classpath. thanks!

[newlifeseattle]

another question, I am able to compile successfully, while get runtimeerror.
so I am wondering whether it is because I set the classpath wrongly, or I import the wrong package in the code or include the wrong package in my folder. thanks!

[Norm]

get runtimeerror.

Please copy and paste all or error message text here.
Don't know how to solve the problem without seeing the error message