Keywords like const and virtual have many different meanings in C++. Similarly, in Java the keyword final has many uses. Some of these are not possible in C#:

                         JDK 1.0.2   JDK 1.1+        C#
constant field             final       final        const
constant local variable    N/A         final         N/A
constant parameter         N/A         final         N/A
non-overridable method     final       final      [default]
    overridable method   [default]   [default]     virtual
non-overridable class      final       final       sealed