J2EEvs.NET

J2EE vs .NET J2EE vs .NET

Presentation by(Presentation by(): ):

Saloni TyagiSaloni Tyagi

E-Mail: E-Mail: [email protected][email protected]

mm

Comparing J2EE with .NET

AgendaAgenda

Platform and ProfilePlatform and Profile ComparisonComparison

Layer-by-Layer comparison of the Layer-by-Layer comparison of the infrastructuresinfrastructures

SummarySummary


Platform and ProfilePlatform and Profile There are the following variants of There are the following variants of

JavaJava JavaCardJavaCard J2ME (Java 2 Platform Micro Edition)J2ME (Java 2 Platform Micro Edition) J2SE (Java 2 Platform Standard Edition)J2SE (Java 2 Platform Standard Edition) J2EE (Java 2 Platform Enterprise Edition)J2EE (Java 2 Platform Enterprise Edition)


.NET framework.NET framework

..NET UniverseNET Universe .NET framework for Standard .NET framework for Standard

and enterpriseand enterprise .NET Compact framework.NET Compact framework

Consistent Programming modelConsistent Programming model Cross platform supportCross platform support Language interoprabilityLanguage interoprability Automatic management of Automatic management of resourcesresources Ease of deploymentEase of deployment

.NET ARCHITECTURE

OPERATING SYSTEM HARDWARE

COMMON LANGUAGE RUNTIME(CLR)

.NET FRAMEWORK BASE CLASS LIBRARY

WINDOWS FORMS ASP.NET CONSOLE ADO.NET

.NET FRAMEWORK CLASS LIBRARY

COMMON TYPE SYSTEM

COMMON LANGUAGE SPECIFICATION

C# VB.NET VISUAL C++ OTHERS..

WINDOWS PRESENTATION

(WPF)

WINDOWS COMMUNICATION

(WCF)

WINDOWSWORKFLOW

(WWF)

WINDOWS CARDSPACE

LINQ ASP.NET 3.5 ADO.NETADDITIONAL

ENHANCEMENTS..

.NET 3

.0.N

ET 3

.5

Visu

al S

tudio

.NET

.NE

T fra

mew

ork

2.0

and

SP1


Layer-By-Layer ComparisonLayer-By-Layer Comparison


The Runtime SystemThe Runtime System


Java Virtual MachineJava Virtual Machine The JVM is intended for Java and interprets Java The JVM is intended for Java and interprets Java

Byte Code. Byte Code. Just-in-Time compilers exist for different Just-in-Time compilers exist for different

environments and OSsenvironments and OSs

Java

Com

piler

CLASS-Files

Classloader/Verifier JIT

NativeCode

Interpreter

Garbage Collection,

Security Manager‘Multithreading,

...


.NET Runtime.NET Runtime Common Language Runtime (CLR)Common Language Runtime (CLR) It is intended for any language compiled to the It is intended for any language compiled to the

MSILMSIL Provides integration for several languagesProvides integration for several languages

C#

VB.NET

C++

Perl

Com

piler

MSIL +Metadata

Loader/Verifier JIT

Managed Code

ExecutionGarbage

Collection,Security,

Multithreading,...


Commonalities and DifferencesCommonalities and Differences

Commonalities:Commonalities: Basic concepts are similarBasic concepts are similar

Differences:Differences: Java is intended for interpretation Java is intended for interpretation Java allows for custom class loaders Java allows for custom class loaders

and security managersand security managers .NET CLR provides a command set .NET CLR provides a command set

that also supports functional that also supports functional languageslanguages


The Object ModelThe Object Model


Object Model (Java)Object Model (Java)

Java has primitive types and classes.Java has primitive types and classes. No automatic boxing/ unboxingNo automatic boxing/ unboxing

Types

Primitive Types Reference Types

InterfacesArrays

Classes


java.lang.Objectjava.lang.Object

The “Mother of all Java classes“The “Mother of all Java classes“public class Object { public Object(); public boolean equals(Object obj); public final Class getClass(); public int hashCode(); public final void notify(); public final void notifyAll(); public String toString(); public final void wait() throws InterruptedException; public final void wait(long timeout) throws InterruptedException; public final void wait(long timeout, int nanos)

throws InterruptedException; protected Object clone() throws CloneNotSupportedException; protected void finalize() throws Throwable;}


Object Model (.NET)Object Model (.NET)

In .NET, everything is an object In .NET, everything is an object

Types

Value Types Reference Types

System ValueTypes

User ValueTypes

Enumerations

InterfacesPointers

Self-describingTypes

ArraysClasses

Delegates Boxed Values

User-Defined


System.ObjectSystem.Object

The “mother of all .NET classes“The “mother of all .NET classes“public class Object { public virtual int GetHashCode(); public virtual bool Equals(); public virtual String ToString(); public static bool Equals(object a, object b); public static bool ReferenceEquals(object a, object b); public Type GetType(); protected object MemberWiseClone(); protected virtual Finalize()´;}


Important Base ClassesImportant Base Classes

.NET.NET JavaJavaGUI Windows.Forms

Web.FormsSWING, AWT

Communication System.Net: Connection, HttpWebRequest, ...

Java.net: Sockets, URL, ...

Container System.Collections: ArrayList, BitArray, Maps, Queue, List, Stack

java.util: Lists, Maps, Sets, Trees, Vectors

No big conceptual differences here.


Multithreading in .NET and JavaMultithreading in .NET and Java

.NET:.NET: .NET uses delegates for multithreading.NET uses delegates for multithreading There are monitors for synchronizationThere are monitors for synchronization

Java :Java : In java there is a class „Thread“ In java there is a class „Thread“ For synchronization there is synchronized For synchronization there is synchronized

keywordkeyword


DeploymentDeployment


Java JAR filesJava JAR files

.jar files are similar to .NET‘s .jar files are similar to .NET‘s assembliesassemblies They can be shared or privateThey can be shared or private They can be signedThey can be signed

They contain They contain types types resourcesresources metadata in manifest filemetadata in manifest file


Assemblies in .NETAssemblies in .NET

Types:Types: Shared Assemblies Shared Assemblies

They are signed by a keyThey are signed by a key They are versioned!!They are versioned!!

Private Assemblies Private Assemblies private to clientprivate to client Avoid version problemsAvoid version problems ..

Menifest

Resources

metadataTYPE1

IL CODE

TYPE2IL CODE

TYPE3IL CODE



Commonalities:Commonalities: Assemblies and JAR files provide Assemblies and JAR files provide

“deployment“ components“deployment“ components Differences:Differences:

Much better versioning support in .NET Much better versioning support in .NET (side-by-side execution)(side-by-side execution)


Database Access in JavaDatabase Access in Java

Java provides JDBC to access Java provides JDBC to access relational datarelational data

ODBCDB

ODBC Driver

JDBC/ODBC Bridge

Driver ManagerConnection

Statement

PreparedStatement

CallableStatement

Resultset

Application


Database Access in .NETDatabase Access in .NET

In .NET there is ADO.NETIn .NET there is ADO.NET ““connectionless”connectionless”

Data Source

DataSetCommandCommand

Connection

DataReader

DataSet

Client

Managed Provider


ADO.NETADO.NET

ADO.NET provides way to acessADO.NET provides way to acess XML dataXML data Relational and application dataRelational and application data

ADO.NET architectureADO.NET architecture DisconnectedDisconnected



Commonalities:Commonalities: Decoupling of the concrete data model Decoupling of the concrete data model

and the userand the user Differences:Differences:

JDBC has a more relational JDBC has a more relational flavor,ADO.NET uses XML flavor,ADO.NET uses XML

JDBC is connection oriented, ADO.NET JDBC is connection oriented, ADO.NET always works non-connected, or offlinealways works non-connected, or offline

.NET DataSets are a kind of In-Memory-.NET DataSets are a kind of In-Memory-Database-Cache.Database-Cache.


WebWeb


Java Server Pages and ServletsJava Server Pages and Servlets

Java also allows for server-side Java also allows for server-side scriptingscripting JSPs are based on ServletsJSPs are based on ServletsWeb

ServerClient(1) get a.jsp (2) process

JVM

JSP

OtherComponents

Database

(4) result

(5) HTTP file

Servlet

(3) gen. Servlet Servlet Impl.


ASP.NET ASP.NET (Server-Side Scripting)(Server-Side Scripting)

ASP.NET Architecture:ASP.NET Architecture:

IIS 5Web

ServerClient

(1) get a.apx (2) process

.NETEngine

.NETAssembly

OtherAssemblies

Database

(3) result

(4) HTTP file


Login Example Login Example

JAVA LOGINJAVA LOGIN

.NET LOGIN.NET LOGIN


.NET and/or Java ?.NET and/or Java ?

.NET is a product, Java and J2EE is a .NET is a product, Java and J2EE is a specificationspecification

Java should be used for:Java should be used for: real big systemsreal big systems Platform independencePlatform independence More scalabilityMore scalability

.NET should be used for:.NET should be used for: Window application and GUIWindow application and GUI Language indepedenceLanguage indepedence


Questions?Questions?

… …....


The EndThe End

Thank you !!Thank you !!

J2EEvs.NET

Technology

object model java java

net types

synchronization java

interpretation java

communication java

servlets java

object model net

forms gui java net