Editing Comparison of C Sharp and Java (section)

=== User-defined value type (struct) ===
C# allows the programmer to create user-defined [[value type]]s, using the {{mono|struct}} keyword. Unlike classes and like the standard primitives, such value types are passed and assigned by value rather than by reference. They can also be part of an object (either as a field or [[Boxed type|boxed]]), or stored in an array without the memory indirection that normally exists for class types.

Because value types have no notion of a {{mono|null}} value and can be used in arrays without initialization, they always come with an implicit [[default constructor]] that essentially fills the struct memory space with zeroes. The programmer can only define additional constructors with one or more arguments. Value types do not have [[virtual method table]]s, and because of that (and the fixed [[memory footprint]]), they are implicitly sealed. However, value types ''can'' (and frequently do) implement [[Interface (object-oriented programming)|interfaces]]. For example, the built-in integer types implement several [[Interface (object-oriented programming)|interfaces]].

Apart from the built-in primitive types, Java does not include the concept of value types.