C# Interview questions and answers for freshers and experienced - Part Two

With my first post of C# Interview Questions and Answers for freshers and experienced developers in this post I am sharing some more questions for the same range of experience.

If you have not provide any access modifier to a class then what is the default access specifier?

This is very basic question but for freshers it can create confusion between internal and private. Coming to the answer when you don't specify any access modifier to class then by default it has "internal" as its access modifier.
Don't get confused between access modifier and member accessibility of class. Access modifier is for class and it is "internal" by default on the other hand member accessibility is for members of a class for which "private" is default access modifier if not provided.

For others below are default access modifiers if not provided.

struct - internal
enum -  public
interface - public
methods, fields, and properties - private

When class is instantiated by using the new keyword then its constructor gets called. Right??
Suppose If I haven't provide any constructor for class then can I create a object a class?

Yes, you can create a object of class as C# will create one by default if you do not provide any constructor which instantiates class object and sets member variables to the default values.

What are Generics in C#?

Generics is C# feature introduced in version 2.0 using which you can define type-safe classes to maximize code reuse,type safety and performance.For example using generic type T you can write a single class that other client code can use without incurring the cost or risk of runtime casts or boxing operations.

In simple words, using generic you can create a common code which will allow us to use type as a parameter.

To know more about generics do visit this post on MSDN here.

Can we inherit from static class if we declare instance constructor in the that class?

No you cannot inherit from static class as by default it is sealed and you cannot declare instance constructor for static class as you cannot create a object of it and CLR loads it automatically when the program or namespace that contains the class is loaded however they can contain static constructor.

What are the different types of JIT (Just in Time) compiler?

There are 3 types for JIT(Just in Time) compiler which are as follows,

Pre-JIT

This type of JIT Compiler compiles complete source code into native code in a single compilation cycle which is done at the time of deployment of the application.

Econo-JIT  

This type of JIT Compiler compiles only those methods that are called at runtime but these compiled methods are removed when they are not required.

Normal JIT 

Normal-JIT compiles only those methods that are called at runtime.These methods are compiled the first time they are called, and then they are stored in cache.When the same methods are called again, the compiled code from cache is used for execution.

Hope you have benefited by reading this post. If you are finding these questions very basic you can read some advanced interview questions here.

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Go to Part Three