Sunday, May 27, 2012

a few CORE differences - c# over java

(Let's be brief, incomplete...Page numbers refer to [[C# precisely]] )
-- fundamental differences among the myriad differences
Diff -- delegates, events, lambda - expanded C++ stateless functor
Diff -- non-virtual method? counter-intuitive to both C++ and java guys,
Diff: yield
diff: enums. Fundamentally different.  A Java enum type is a "singleton" class.
Diff -- generics
Diff -- expression tree

--fundamental but less exploited
Diff -- ref param, out param
** assignment to a method param are visible to caller method ! P71
Diff -- hiding rule -- less clean than java. Even more complicated than C++ hiding rules
** you can even hide a virtual method! P 75

Diff: struct? a "kernel" innovation but unimportant in "userland". P54
Diff: simple (i.e. primitive) types are aliases of struct types. Replaces autoboxing. Fundamentally they are same as java primitives
Diff: operator overloading like ==. Similar to equals() override in J
diff: access modifiers "internal", default. Similar to "package access" in J
diff: Integration of primitive and wrapper classes into structs -- primitive wrappers glorified
diff: simple types having methods.
--higher-level or local/peripheral features
diff: explicit interface members
class properties and indexers? accessors glorified
implicit user-defined type conversions? tricky and not widely used
IDisposable/using -- "finally" glorified
rectangular/jagged arrays? Only one of them is widely used.
all nested classes are all static
static classes
static ctor

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