REVOLUTION FOREVER

Features of C# Absent in Java

C# includes more primitive types and the functionality to catch arithmetic exceptions.
Includes a large number of notational conveniences over Java, many of which, such as operator overloading and user-defined casts, are already familiar to the large community of C++ programmers.
Event handling is a "first class citizen"—it is part of the language itself.
Allows the definition of "structs", which are similar to classes but may be allocated on the stack (unlike instances of classes in C# and Java).
C# implements properties as part of the language syntax.
C# allows switch statements to operate on strings.
C# allows anonymous methods providing closure functionality.
C# allows iterator that employs co-routines via a functional-style yield keyword.
C# has support for output parameters, aiding in the return of multiple values, a feature shared by C++ and SQL.
C# has the ability to alias namespaces.
C# has "Explicit Member Implementation" which allows a class to specifically implement methods of an interface, separate from its own class methods. This allows it also to implement two different interfaces which happen to have a method of the same name. The methods of an interface do not need to be public; they can be made to be accessible only via that interface.
C# provides integration with COM.
Following the example of C and C++, C# allows call by reference for primitive and reference types.

Java's strictfp keyword guarantees that the result of floating point operations remain the same across platforms.
Java supports checked exceptions for better enforcement of error trapping and handling.