I am new to java..

I have an example structure as follows:

```
/folder/foo.java /folder/bar.java /folder/foobar.java

```

Now I am trying to run foobar.java but I get the following exception

```
Exception in thread "main" java.lang.ClassNotFoundException: /folder/foobar
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:247)
    at org.apache.hadoop.util.RunJar.main(RunJar.java:149)

```

Then I tried to configure it by doing 

```
java -classpath  .  foobar 
Exception in thread "main" java.lang.NoClassDefFoundError: foobar
Caused by: java.lang.ClassNotFoundException: foobar
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)

```

Any clues?
Thanks