For the following example

   String t = "test"
   Class c = t.getClass();
   Class sig[] = new Class[2];
   sig[0] = null;
   sig[1] = null;
   c.getMethod("foo", sig);

compiler prints the following warning msg:

warning: [unchecked] unchecked call to getMethod(java.lang.String,java.lang.Class<?>...)
as a member of the raw type java.lang.Class

Changing the Class type of "c" to Class<?> removes the warning msg.

Discussed this with Peter and he said:
>I don't think the compiler needs to give a warning in this particular
>case.