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Improving my SQL BI Skills

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Category Archives: OOPS

OOPS Concepts

Class — Definition and Small Explaination

12 Sunday Sep 2010

Posted by Pawan Kumar Khowal in OOPS

≈ Leave a comment


I have been interviewed by many people in my life. Interviewers often go with simple root level questions like what is an object.
Many candidates often get confused with simple questions ! One more is given below

Class — Definition and Small Explaination

1.A class definition is like a blueprint that specifies what the type can do.

2.A class is a set of objects having similar state and behaviour.

3.Memory is not allocated for classes but objects of that class.

4.Class represents abstraction.

5.A single object is simply an instance of a class.

6.Objects that share no common structure and behaviour cannot be grouped together in a class.

7.A class is a template from which we can create objects objects.

—————

Pawan Kumar

Pawankkmr@hotmail.com

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Object — Definition and Small Explaination

12 Sunday Sep 2010

Posted by Pawan Kumar Khowal in OOPS

≈ Leave a comment


I have been interviewed by many people in my life. Interviewers often go with simple root level questions like what is an object.
Many candidates often get confused with simple questions ! One of them is given below..

Object — Definition and Small Explaination

1. Object is a concrete entity that exists in time and space.

2. An object has 3 things.

a) State
b) Behaviour
c) Identity

3. The state and behaviour of similar objects are defined in their common class.

4. The words Instance and objects are interchangeable.

5. State of an object consists of properties i.e member variables with their dynamic values.

6. Behaviour means how an object reacts and acts when state changes and message passing. Behaviour means functions or methods defined in a class.

7. Identity is the property of an object which distinguishes it from all other objects.

8.A class or struct definition is like a blueprint that specifies what the type can do.

9. An object is basically a block of memory that has been allocated and configured according to the blueprint. A program may create many objects of the same class.

10.Objects are also called instances, and they can be stored in either a named variable or in an array or collection. Client code is the code that uses these variables to call the methods and access the public properties of the object.

11.In an object-oriented language such as C#, a typical program consists of multiple objects interacting dynamically.

12. Please go through the example given taken from MSDN.

// keyword_object.cs
using System;
class SampleClass
{
public int i = 10;
}

class MainClass
{
static void Main()
{
object a;
a = 1; // an example of boxing
Console.WriteLine(a);
Console.WriteLine(a.GetType());
Console.WriteLine(a.ToString());

a = new SampleClass();
SampleClass classRef;
classRef = (SampleClass)a;
Console.WriteLine(classRef.i);
}
}

Output
1
System.Int32
1
10

—————

Pawan Kumar

Pawankkmr@hotmail.com

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Properties of Static Constructors

04 Wednesday Aug 2010

Posted by Pawan Kumar Khowal in OOPS

≈ Leave a comment


Some of the properties of Static Constructors are given below. Please add if you know more…

A static constructor does not take access modifiers

A static constructor does not take parameters.

A static constructor is called automatically to initialize the class
before the first instance is created or any static members are
referenced.

A static constructor cannot be called directly.

The user has no control on when the static constructor is executed in the program.

A typical use of static constructors is when the class is using a
log file and the constructor is used to write entries to this file.

Other typical use of static constructor is when the class is using a message box to show the message to the end user.

Developer can directly write classname.method name to access the methods.

Will add some more to complete the static constructors.

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