java every where

this fun video about java
i like it so much
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Network

Network will be New topic

java technology

java technology

this presentation Describes

• java family
• how java code run
• JDK &JRE
• J2ME Briefly view

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امتحانات ال windows الجديدة

امتحانات ال windows الجديدة



ICDL Windows

Good C# interview questions and answers1

What’s the advantage of using System.Text.StringBuilder over System.String? StringBuilder is more efficient in the cases, where a lot of manipulation is done to the text. Strings are immutable, so each time it’s being operated on, a new instance is created.

Can you store multiple data types in System.Array? No.

What’s the difference between the System.Array.CopyTo() and System.Array.Clone()? The first one performs a deep copy of the array, the second one is shallow.

How can you sort the elements of the array in descending order? By calling Sort() and then Reverse() methods.

What’s the .NET datatype that allows the retrieval of data by a unique key? HashTable.

What’s class SortedList underneath? A sorted HashTable.

Will finally block get executed if the exception had not occurred? Yes.

What’s the C# equivalent of C++ catch (…), which was a catch-all statement for any possible exception? A catch block that catches the exception of type System.Exception. You can also omit the parameter data type in this case and just write catch {}.

Can multiple catch blocks be executed? No, once the proper catch code fires off, the control is transferred to the finally block (if there are any), and then whatever follows the finally block.

Why is it a bad idea to throw your own exceptions? Well, if at that point you know that an error has occurred, then why not write the proper code to handle that error instead of passing a new Exception object to the catch block? Throwing your own exceptions signifies some design flaws in the project.

What’s a delegate? A delegate object encapsulates a reference to a method. In C++ they were referred to as function pointers.

What’s a multicast delegate? It’s a delegate that points to and eventually fires off several methods.

How’s the DLL Hell problem solved in .NET? Assembly versioning allows the application to specify not only the library it needs to run (which was available under Win32), but also the version of the assembly.

What are the ways to deploy an assembly? An MSI installer, a CAB archive, and XCOPY command.

What’s a satellite assembly? When you write a multilingual or multi-cultural application in .NET, and want to distribute the core application separately from the localized modules, the localized assemblies that modify the core application are called satellite assemblies.

What namespaces are necessary to create a localized application? System.Globalization, System.Resources.

What’s the difference between // comments, /* */ comments and /// comments? Single-line, multi-line and XML documentation comments.

How do you generate documentation from the C# file commented properly with a command-line compiler? Compile it with a /doc switch.

What’s the difference between and XML documentation tag? Single line code example and multiple-line code example.

Is XML case-sensitive? Yes, so and are different elements.

What debugging tools come with the .NET SDK? CorDBG – command-line debugger, and DbgCLR – graphic debugger. Visual Studio .NET uses the DbgCLR. To use CorDbg, you must compile the original C# file using the /debug switch.

What does the This window show in the debugger? It points to the object that’s pointed to by this reference. Object’s instance data is shown.

What does assert() do? In debug compilation, assert takes in a Boolean condition as a parameter, and shows the error dialog if the condition is false. The program proceeds without any interruption if the condition is true.

What’s the difference between the Debug class and Trace class? Documentation looks the same. Use Debug class for debug builds, use Trace class for both debug and release builds.

Why are there five tracing levels in System.Diagnostics.TraceSwitcher? The tracing dumps can be quite verbose and for some applications that are constantly running you run the risk of overloading the machine and the hard drive there. Five levels range from None to Verbose, allowing to fine-tune the tracing activities.

Where is the output of TextWriterTraceListener redirected? To the Console or a text file depending on the parameter passed to the constructor.

How do you debug an ASP.NET Web application? Attach the aspnet_wp.exe process to the DbgClr debugger.

What are three test cases you should go through in unit testing? Positive test cases (correct data, correct output), negative test cases (broken or missing data, proper handling), exception test cases (exceptions are thrown and caught properly).

Can you change the value of a variable while debugging a C# application? Yes, if you are debugging via Visual Studio.NET, just go to Immediate window.

Explain the three services model (three-tier application). Presentation (UI), business (logic and underlying code) and data (from storage or other sources).

What are advantages and disadvantages of Microsoft-provided data provider classes in ADO.NET? SQLServer.NET data provider is high-speed and robust, but requires SQL Server license purchased from Microsoft. OLE-DB.NET is universal for accessing other sources, like Oracle, DB2, Microsoft Access and Informix, but it’s a .NET layer on top of OLE layer, so not the fastest thing in the world. ODBC.NET is a deprecated layer provided for backward compatibility to ODBC engines.

What’s the role of the DataReader class in ADO.NET connections? It returns a read-only dataset from the data source when the command is executed.

What is the wildcard character in SQL? Let’s say you want to query database with LIKE for all employees whose name starts with La. The wildcard character is %, the proper query with LIKE would involve ‘La%’.

Explain ACID rule of thumb for transactions. Transaction must be Atomic (it is one unit of work and does not dependent on previous and following transactions), Consistent (data is either committed or roll back, no “in-between” case where something has been updated and something hasn’t), Isolated (no transaction sees the intermediate results of the current transaction), Durable (the values persist if the data had been committed even if the system crashes right after).

What connections does Microsoft SQL Server support? Windows Authentication (via Active Directory) and SQL Server authentication (via Microsoft SQL Server username and passwords).

Which one is trusted and which one is untrusted? Windows Authentication is trusted because the username and password are checked with the Active Directory, the SQL Server authentication is untrusted, since SQL Server is the only verifier participating in the transaction.

Why would you use untrusted verificaion? Web Services might use it, as well as non-Windows applications.

What does the parameter Initial Catalog define inside Connection String? The database name to connect to.

What’s the data provider name to connect to Access database? Microsoft.Access.

What does Dispose method do with the connection object? Deletes it from the memory.

What is a pre-requisite for connection pooling? Multiple processes must agree that they will share the same connection, where every parameter is the same, including the security settings.

to see more questions in doc formatting download it

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اسطونات تعليم جافا موسوعة بالعربى

مجموعة من الاسطونات الممتازة لتعلم جافا

الجزء الاول : وهو خاص باساسيات الجافا

(J2SE)

الجزء الثاني : وهو خاص ببرمجة المواقع والوب

(J2EE)

الجزء الثالث : وهو خاص بامتحانات الشهادة المعتمدة من جافا

الجزء الاول

J2SE

هذه سبع محاضراتخاصةبمبادئ الجافا او ما يعرفبالJ2SEمهمة للغاية لمن اراد ان يبدا بمشواره نحوتعلم الجافا واتقنها والحجم صغير جدا
Intro To Java 15.5MB

Datatypes and Variables 16.5MB

Arithmetic Operators 15.5MB

Control Structures 37.2MB

Loops 18.4MB

Strings & Objects 30.1MB

Arrays 15.2MB

Introduction to the Java

Programming ********

Running Time: 8 hrs / 92 Lessons
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J2EE

J2EE (Java 2 Enterprise Edition)

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Running Time: 14 Hours
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Sun Certified Programmer for Java 2 Platform 1.4
Exam-Pack CX-310-035

خاص بامتحان الشهادة للSCJP

Running Time: 15 Hours

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ولمزيد من المعلومات حول هذا الامتحان
من الموقع الرسمي للجافا هنا

الموضوع منقول للأمانة

تعلم جافا فديوهات عربى

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شرح مميز جدااااااا
تعلم جافا بدون عناء

محرك البحث Cuil وجوجل

محرك البحث الجديد Cuil يحتوي 3 أضعاف ما تحتويه جوجل

تخيل أن تستطيع البحث في 121,614,892,992 صفحة إنترنت (ما يزيد عن 120 مليار صفحة) ، هذا ما هو مكتوب على الصفحة الرئيسة لمحرك البحث الجديد Cuil (ينطق كول Cool) . وتؤكد مؤسسة ورئيسة الموقع أنا باتيرسون Anna Patterson بأن هذا الرقم يزيد بثلاثة أضعاف عن ما يحتويه محرك البحث جوجل ، حيث أنها عملت لدى جوجل حتى عام 2006م وتعلم بمحتوياته . وقد أنشأ هذا المحرك مجموعة من مهندسي جوجل السابقين وهذا يعطي أنطباع بقوته وقدرته على المنافسة . الموقع الجديد مدعوم برأسمال يبلغ 33 مليون دولار مما يساعد التطوير السريع له . الملاحظ على الموقع أنه يعرض نتائج البحث بأسلوب المجلات (اعمدة وصفوف) ويعتمد طريقة البحث والتحليل في محتوى الصفحة وهذا سينعكس في نتائج البحث إيجاباً . أعتقد بأن هذا الخبر سيجعل مايكروسوفت وياهو يفكرون مرة أخرى في الإندماج بعد زيادة حدة المنافسة .

الكمبيوتر و مشاكل الجواز

1. مبرمج اتجوز قدم لمراته الشبكة فى ايقونة

2. كل ما يجى يتخانق معاها يهنج

3. اتخانق معاها راح مفرمتها

4. ضربته بالشبشب عملتله باد سيكتور

5. زهق من خناقاتها عملها بلوك وعمل نفسه hidden

6. بعد كدة طلب منها انهم يصطبوا حياتهم من جديد

7. و لما حب يفضحها حط صورتها على الفيس بوك !!!!

8. فوجئ ان سيرتهم بقت فى كل شات رووم

9. خلف ولد طلع منه كوبى عشان لو حصله حاجة!!!!!

10. كل ما يجى ينام يعمل لنفسه" shut down "

11. مراته اكتشفت أنه بيعمل هاكينج على مرات جارهم

12. سدت عليه الطريق بـ"firewall "

13. حاول يسستمها على مزاجه هنجت منه

14. بعت لها ورقت طلاقها على الميل

15. حب يرجعها تانى عملها " Re-install "

16. تاهت منه بحث عنها فى Google

واحد ندل "نكت على الندلة"

واحد ندل إتجوز ....

راح شهر العسل لوحده

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واحد ندل أبوه طرده من البيت

رجع كتب على باب بيتهم

' مقر تنظيم القاعدة '

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واحد ندل عنده تاكسي، طلق مراته،

راح يوصلها لبيت ابوها

شغّل العدّاد

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واحد ندل عيّنوه رئيس الشرطة،

أول حاجة عملها غير رقم الطوارئ من 122

إلى 09742806329577935

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حرامي ( ندل ) دخل بيت .. ما لقاش حاجة يسرقها ...

اتصل بأمريكا

و خلى السماعة مرفوعة !!! و نزل

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واحد ندل صوّر أبوه وهم بيدفنوه .......

وكل يوم يفرج الشريط لأمه !!

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واحد ندل اتصل براديو نجوم إف إم و طلب أغنية

' بابا فين ' .... وأهداها للأيتام فى يوم اليتيم

------------ --------- -------

واحد ندل قعد سنة يتحايل على حبيبته علشان تخرج معاه ، ولما وافقت

راح قال لأبوها

------------ --------- --

واحد ندل عينوه مدرّس بمدرسة معوَّقين،

حط أول حصة , ألعاب رياضية ' قفز حواجز '

------------ --------- ---

ندل خصمت الدولة نصف راتبه كتبرع للإنتفاضة ..

قام إتبرع بالنص الثاني لإسرائيل

واحد ندل قراء التدوين

و ما مكتبش رد

راتب الامراتى والمصرى for fun

الراتب الاماراتى والراتب المصري‏

مصري سأل إماراتي:

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الإماراتي:

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بعدين سأل الإماراتي المصري:

وأنت كم راتبك؟

قال المصري:

راتبي 300 جنيه!

رد الإماراتي:

هذي بدل أيش؟

قال المصرى:

بدل ما أشحت!

لينكات سى شارب مفيدة جدااااااااااا

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