Sadface.

138-78-106-56:src2 sean$ ls
test.java
138-78-106-56:src2 sean$ javac test.java
138-78-106-56:src2 sean$ # As you see, the compile works.
138-78-106-56:src2 sean$ # Now, let's try running it.
138-78-106-56:src2 sean$ java test
This file works.
138-78-106-56:src2 sean$ # Hooray!
138-78-106-56:src2 sean$ # But let's go up a directory.
138-78-106-56:src2 sean$ cd ..
138-78-106-56:Grading sean$ java src2/test
Exception in thread "main" java.lang.NoClassDefFoundError: src2/test (wrong name: test)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
    at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
138-78-106-56:Grading sean$ # But why?? Why won't this work??
138-78-106-56:Grading sean$ ls
grade.py    src.zip     src2
138-78-106-56:Grading sean$ cd src2; ls
test.class  test.java
138-78-106-56:src2 sean$ java test
This file works.
138-78-106-56:src2 sean$ logout

[Process completed]