HI all!

I created a class as follow, HomeWork.class:

package junit.samples;

// Imports

import junit.framework.Test;

import junit.framework.TestCase;

public class HomeWork extends TestCase {

// Constructors

public HomeWork() { }

// Methods

public static void main(String[] stringArray) { }

public static Test suite() { return null;}

public void testEmptyCollection() { }

}

and HomeWork.java as below:

package junit.samples;

import java.util.*;

import junit.framework.*;

public class HomeWork extends TestCase {

public void testEmptyCollection() {

Collection collection = new ArrayList();

assertTrue(collection.isEmpty());

}

public static Test suite() {

TestSuite suite = new TestSuite();

suite.addTest(new HomeWork("testEmptyCollection")

{ protected void runTest() { testEmptyCollection(); }

}

);

return suite;

}

public static void main(String args[]) {

junit.swingui.TestRunner.run(suite());

}

}

I place it in C:junit3junit directory
and run as follow command:

at c:>java swingui.TestRunner junit.samples.Homework

and I got error "Bad magic number"
Please help me !! I dont know why??? thanks