Technology Questions

Q:

When is the onStop() method invoked?

Answer

A call to onStop method happens when an activity is no longer visible to the user, either because another activity has taken over or if in front of that activity.

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Q:

What is android? What are the features of Android?

Answer

Android is a stack of software for mobile devices which has Operating System, middleware and some key applications. The application executes within its own process and its own instance of Dalvik Virtual Machine. Many Virtual Machines run efficiently by a DVM device. DVM executes Java language’s byte code which later transforms into .dex format files.


Features of Android :


- Components can be reused and replaced by the application framework.
- Optimized DVM for mobile devices
- SQLite enables to store the data in a structured manner.
- Supports GSM telephone and Bluetooth, WiFi, 3G and EDGE technologies
- The development is a combination of a device emulator, debugging tools, memory profiling and plug-in for Eclipse IDE.

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Q:

What are fact tables and dimension tables?

Answer

Business facts or measures and foreign keys are persisted in fact tables which are referred as candidate keys in dimension tables. Additive values are usually provided by the fact tables which acts as independent variables by which dimensional attributes are analyzed.


Attributes that are used to constrain and group data for performing data warehousing queries are persisted in the dimension tables.


 

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Q:

What is JavaScript?

Answer

JavaScript is a scripting language most often used for client-side web development.

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Subject: Web Technology

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Q:

What are the ways of preserving data on a Web Form in ASP.NET?

Answer

These objects provide two levels of scope:


Application State


Data stored in the application object can be shared by all the sessions of the application.


Application object stores data in the key value pair.

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Subject: .NET
Job Role: Software Architect

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Q:

How can we encrypt the username and password using PHP?

Answer

User names and passwords in PHP can be encrypted using md5 function.


MD5 function calculates the md5 hash of a string. It is basically used for encryption. It is also used for digital signature applications, where a large file must be "compressed" in a secure manner.


Example:


Md5($str);


 


Crypt() function can also be used to encrypt a string,. It used MD5, DES or blow fish algorithms for encryption.


Syntax:


Crypt(str, salt)


Salt is an optional parameter used to increase the number of characters encoded, to make the encoding more secure

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Subject: PHP

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Q:

What is MultiThreading?

Answer

Executing two or more blocks (threads) of a program at a time is called MultiThreading.

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Subject: Java

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Q:

What are the basic interfaces of Java Collections Framework ?

Answer

Java Collections Framework provides a well designed set of interfaces and classes that support operations on a collections of objects. The most basic interfaces that reside in the Java Collections Framework are:


Collection, which represents a group of objects known as its elements.


Set, which is a collection that cannot contain duplicate elements.


List, which is an ordered collection and can contain duplicate elements.


Map, which is an object that maps keys to values and cannot contain duplicate keys.

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Subject: Java

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