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Comparision between C# and JAVA

by Vahid 25. January 2009 15:30

here is a quick comparision between microsoft c# (.net) and java

Concept	C#	Java	Notes
Virtual machine	CLR	JVM	CLR is not quite the same as JVM concept, but very similar.
Namespace	namespace/ using	package/ imports	C# allows multiple namespaces in a file, Java does not.

Attributes	[attribute]	@annotation	C# 1.0, Java 1.5
Base class	base	super
abstract objects	abstract class	abstract class
abstract methods	abstract	abstract
sealed objects	sealed	final	In both cases, sealing is discouraged.
sealed methods	sealed	final
replacement methods	new keyword	not supported	Effectively ignores the base method.
constants	const / readonly	final static
Enum’s	enum keyword	enum keyword	C# 1.0, Java 1.5
virtual functions	explicit virtual	always virtual	This is one of the gotcha’s when working between the two languages
override intention	override	@Override (though members override by default)	Causes compiler error if method is not actually overriding a base method.
Class/Type representation of simple types	Map 1:1 with the simple type keywords.	Behave different to simple type keywords.	C# seems more natural than Java in it’s behavior
Getters/Setters	get/set keywords, behave like properties	Explicit get/set methods	Again, C# seems more natural with this.
Events	Typically via delegates	Typically via interfaces
Reference equivalence	Object. ReferenceEquals()	==	Another C# vs Java gotcha.
Value equivalence	== or Object.Equals()	object.equals(), == for value types	Java’s choice of using == for reference equals adds to the need to distinguish between objects and value types.
Object introspection	Object.GetType()	object.class	Very similar
Exceptions thrown by method	implicit	throws keyword	Actually liking Java’s philosophy here, albeit taking some getting used to.
Stack scoping	using keyword, or try/finally keywords	try/finally keywords	‘using’ keyword is syntax sugar that calls IDisposable.Dispose() method at end of block.
Simple synchronization	lock keyword	synchronized keyword	‘synchronized’ can also be used on a method.
Generics	class<type>	class<type>	C# 2.0. Java 1.5. C# has a cleaner implementation and discovery of generics in reflection. In Java, class and class<type> cannot co-exist. class becomes synonymous to class
Output parameters	out, ref	Not allowed	Not a huge loss in Java, there are simple workarounds.
Switch fall-through	Not allowed	Allowed
iteration	foreach(type x in y)	for (type x : y)	C# 1.0. Java 1.5.
Lambda/Closures	=>	(future)	C# 3.0. Java 1.7 (maybe)

.Net | JAVA | Technical

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Comparision between C# and JAVA#

Comparision between C# and JAVA