How do .NET and J2EE compare
As you can see, the .NET platform has an array of technologies under its umbrella. Microsoft is ostensibly presenting these as alternatives to other existing platforms, like J2EE and CORBA, in order to attract developers to the Windows platform. But how do the comparisons play out item-by-item One way to lay out the alternatives between .NET and J2EE is shown in the following table:
| Microsoft.NET | J2EE | Key differentiators |
|---|---|---|
| C# programming language | Java programming language | C# and Java both derive from C and C++. Most significant features (e.g., garbage collection, hierarchical namespaces) are present in both. C# borrows some of the component concepts from JavaBeans (properties/attributes, events, etc.), adds some of its own (like metadata tags), but incorporates these features into the syntax differently. Java runs on any platform with a Java VM. C# only runs in Windows for the foreseeable future. C# is implicitly tied into the IL common language runtime (see below), and is run as just-in-time (JIT) compiled bytecodes or compiled entirely into native code. Java code runs as Java Virtual Machine (VT) bytecodes that are either interpreted in the VM or JIT compiled, or can be compiled entirely into native code. |
| .NET common components (aka the ".NET Framework SDK") | Java core API | High-level .NET components will include support for distributed access using XML and SOAP (see ADO+ below). |
| Active Server Pages+ (ASP+) | Java ServerPages (JSP) | ASP+ will use Visual Basic, C#, and possibly other languages for code snippets. All get compiled into native code through the common language runtime (as opposed to being interpreted each time, like ASPs). JSPs use Java code (snippets, or JavaBean references), compiled into Java bytecodes (either on-demand or batch-compiled, depending on the JSP implementation). |
| IL Common Language Runtime | Java Virtual Machine and CORBA IDL and ORB | .NET common language runtime allows code in multiple languages to use a shared set of components, on Windows. Underlies nearly all of .NET framework (common components, ASP+, etc.). Javas Virtual Machine spec allows Java bytecodes to run on any platform with a compliant JVM. CORBA allows code in multiple languages to use a shared set of objects, on any platform with an ORB available. Not nearly as tightl <script type="text/java script">
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