C# and .Net vs. Java - Apache Software...

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C# and .Net vs.Java

Bernhard Herzog, May 2001Copyrights (c) 2001, Sysis AG


Agenda

§ Introduction§ Evolution of Component Software§ The Common Language Runtime§ HalloWorld in C#, VB.Net and Java§ Assemblies vs. JAR-Files§ ASP.Net§ XML, SOAP and WebServices§ Microsoft Visual Studio 7§ Q & A


The Actors

§ James Gosling§ Anders Hejlsberg§ Bill Gates, Chief Software Architect,

Microsoft§ Larry Ellison, CEO, Oracle§ Louis Gerstner, CEO, IBM§ Scott McNealy, CEO, Sun


Evolution of Component Software

Smalltalk

C

Basic

CGI ISAPI

VisualBasic

C++

Java

COM

ASP

MTS/COM+

WAM

JSP/Servlet

YouAre

Here

EJB

Delphi


CLR = Common Language Runtime

§ Technology for integrating softwarecompontents from multiple organizations§ Pervasive type system that spans programming

language and operating system boundaries


CLR: Pervasive TypeCOM: Type Fragmentation

Lib1 Lib2 Lib3

Lib1 Lib2 Lib3

COM, CORBA Type System Internal Type System

CLR Type System


Language Choices

IL ASM

MC++

C#/VB.NET

Productivity

Con

trol


HalloWorld in C#, VB.Net and Java

public class HalloWorld{

public static void Main(){

System.Console.WriteLine("Hello, World");}

}public class HalloWorld{

public static void main(String argv[]){

System.out.println("Hallo, World");}

}


Assemblies vs. JAR-Files (1)

main.cs csc.exe /t:exe /r:aux.dll main.cs main.exe

aux.cs csc.exe /t:library aux.cs aux.dll



jar cf Aux.jar demo\Aux.class Aux.jar

Aux.java jikes demo\Aux.java Aux.class

Main.java jikes -CLASSPATH ... Main.java Main.class



§ ildasm§ Global Assembly Cache vs. CLASSPATH and

lib/ext§ Versioning, Culture, Originator§ AppDomains vs. ClassLoaders


C# Language Features§ Boxing, Structs§ Preprocessor§ Enums§ Properties („Component Oriented“)§ Indexers (like operator[], but parameter of any type),

foreach§ operator overloading, conversions§ Delegates and Events§ XML Documentation§ Attributes§ no checked Exceptions


ASP.NET

§ Server-side controls that fire events (drag anddrop in forms editor)§ Pages are compiled as with JSPs§ Session state can be moved to other process,

other machine or to DB§ Breakpoints supported§ Full Power of .NET Framework available


ASP.NET (and ADO.NET)<%@ Page Language="C#" Debug="true" %><%@ Import Namespace="System" %>

<html><body><%

for (int i = 0; i < 10; i++){

%><%= i %><%

}%></body></html>


XML

§ Technology for representing data andinformation§ Type system provided by XML Schemas (XSD)


XML Type System

Lib1 Lib2 Lib3

XML Type System Internal Type System


XML Infoset (Abstract Model)vs. XML + NS (Concrete Syntax)

Web

Ser

ver

XMLX

ML

Par

ser

XML-basedProcessingSoftware


TDS (or equivalent)X

mlR

eade

r Int

erfa

ceXML-basedProcessingSoftware

XML Infoset (Abstract Model)vs. XML + NS (Concrete Syntax)

OLE

DB

/Sys

tem

.Dat

a


XML Schema

§ Replacement for DTD§ Reflection capabilities for XML§ Schema compilers could eventually replace

tedious XML-Parsing


SOAP

§ RPC-Style Applications§ WSDL: Web Service Description Language

(MS+IBM)§ UDDI: Universal Description, Discovery and

Integration (MS+IBM+Ariba)§ Example: Book Reviews Lookup via ISBN number


Web Service (ASMX)

<%@ WebService Language="C#" Class=“Service" %>

using System;using System.Web.Services;

public class Service{

[WebMethod()]public String getText(int index){

.

.

.


Create Proxy Class

§ webserviceutil /c:proxy /pa:downloaded.sdl/l:CSharp /n:XYZNameSpace§ csc /out:bin\XYZNameSpace.dll /t:library

/r:system.web.services.dll/r:system.xml.serialization.dll XYZNameSpace.cs


Sun‘s Answers to Web Services

§ EJBs, CORBA, RMI?§ JINI?§ JXTA (P2P)?


Microsoft Visual Studio 7


Things to Bear in Mind

§ Microsoft had one of the fastest and mostreliable Java Virtual Machines§ IL Code is never interpreted§ Microsoft has an excellent high quality

Development Environment§ For the near future only on Windows§ Java is not open (source) or a standard (?)§ Is Java 1.3 bloated, resource-hungry and

unreliable?


Q & Ahttp://www.gotdotnet.com/

http://www.javausergroup.at/http://www.sysis.at/

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