// C:\java_shit\Test.java

class Test
{
	public static void main(String args[])
	{
		System.out.println("foo");
	}
}


// java -classpath C:\java_shit Test.java

C:\java_shit>java -classpath C:\java_shit Test.java
Exception in thread "main" java.lang.NoClassDefFoundError: Test/java
Caused by: java.lang.ClassNotFoundException: Test.java
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClassInternal(Unknown Source)
Could not find the main class: Test.java.  Program will exit.