Technology Questions

Q:

If I call performSelector:withObject:afterDelay: – is the object retained?

Answer

Yes the object is retained. It creates a timer that calls a selector on the current threads run loop. It may not be 100% precise time-wise as it attempts to dequeue the message from the run loop and perform the selector.

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Q:

What files are important in a bootable Windows XP operating system?

Answer

There are four important files in order to make a bootable Windows XP operating system. These are Ntldr, Ntdetect, Boot.ini and Ntfs.sys

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Q:

What is Marshalling?

Answer

Marshalling is the process of gathering data from one or more applications or non-contiguous sources in computer storage, putting the data pieces into a message buffer, and organizing or converting the data into a format that is prescribed for a particular receiver or programming interface.  

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Q:

How do we measure progress in Data Integration?

Answer

Look for the existence of the following items:


- Generic Data Models


- An Enterprise Data Platform


- Identify the Data Sources


- Selection of a MDM Product


- Implementation of a Customer Master Index or appropriate alternative

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Q:

How does DB2 determine what lock- size to use?

Answer

1. Based on the lock-size given while creating the table space


2. Programer can direct the DB2 what lock-size to use


3. If lock - size ANY is specified, DB2 usually chooses a lock-size of PAGE

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Q:

What is the purpose of declaring a variable as final?

Answer A final variable's value can't be changed. final variables should be initialized before using them.
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Subject: Java

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Q:

What is a PHP Filter?

Answer

A PHP filter is used to validate and filter data coming from insecure sources.
To test, validate and filter user input or custom data is an important part of any web application.
The PHP filter extension is designed to make data filtering easier and quicker.

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Subject: PHP

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Q:

Why interface method is always public?

Answer

To make this method available to every implementation class

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Subject: Java
Job Role: IT Trainer

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