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Which design pattern should have private or protected constructor?

Posted By :nishithraj     Posted Date :December 31, 2009    Points :10   Category :.NET Framework 
singleton design pattern should have private or protected constructor

You can also find related Interview Question to Which design pattern should have private or protected constructor?  below: 

What is Private Constructor? and it's use? Can you create instance of a class which has Private Constructor?

  
When a class declares only private instance constructors, it is not possible for classes outside the program to derive from the class or to directly create instances of it. (Except Nested classes)
Make a constructor private if:

1) You want it to be available only to the class itself. For example, you might have a special constructor used only in the implementation of your class' Clone method.

2) You do not want instances of your component to be created. For example, you may have a class containing nothing but Shared utility functions, and no instance data. Creating instances of the class would waste memory. (More...)

What is the Scope of public/private/friend/protected/protected friend?

  
Scope of public/private/friend/protected/protected friend.

Visual Basic/Visual C#
Public/public All members in all classes and projects.

Private/private Members of the current class only.

Friend/internal All members in the current project.

Protected/protected All members in the current class and in classes derived from this member's class. Can be used only in member definitions, not for class or module definitions.

Protected Friend/protected internal All members in the current project and all members in classes derived from this member's class. Can be used only in member definitions, not for class
or module definitions. (More...)

What is a private constructor? Where will you use it?

  
When you declare a Constructor with Private access modifier then it is called Private Constructor. We can use the private constructor in singleton pattern.

If you declare a Constructor as private then it doesn't allow to create object for its derived class, i.e you loose inherent facility for that class. (More...)

A constructor can be private. True or False

  
False. A constructor should not be private. (More...)

Whether we can create a private constructor for a class?

  
Yes it is possible. we can create a private constructor for a class (More...)

Where we can use the private constructor?

  
A private constructor is a special instance constructor. It is commonly used in classes that contain static members only. (More...)

What is the use of private constructor in Java?

  
A private constructor is used when there is no requirement of another class to invoke that. It is used mostly in implementing singletons. A static method is used for managing the creating the instances of that class.

The following is the example of private constructor.

public class Singleton {
private static Singleton instance;.
//private constructor
private Singleton {
// some code goes here
}
} (More...)

You are designing a single person shooter game application. The player can choose between multiple guns.
1) Pistol with 5 bullets
2) Shotgun with 100 bullets
3) Grenade Launcher with 20 grenades

Each gun will have different sound effects and graphics.

Pressing Ctrl+Space should rotate between guns.
Which design pattern should you employ for this?

  
Use Strategy Pattern.

Explanation: Each gun having different performance and graphics.
So this can be accomodated in the algorithm.

Strategy pattern is best suited for shifting the guns/algorithms

There will be a IGun interface implemented by 3 classes
Pistol : IGun
Shotgun : IGun
GrenadeLauncher : IGun (More...)

What is design pattern?

  
Design pattern are recurring solution to the recurring problem.

There are basically classified in to three categories. They are,
1. Creational pattern
2. Structural pattern
3. Behavioural pattern.
(More...)

Which design pattern to use if i needed to add additional responsibilities at runtime?

  
Decorator Pattern design pattern is use if i needed to add additional responsibilities at runtime (More...)

Which is the design pattern that is type-safe and still extensible on runtime?

  
Decorator Pattern design pattern that is type-safe and still extensible on runtime (More...)

What is a Design Pattern?

  
Design Pattern is a re-usable, high quality solution to a given requirement, task or recurring problem. Further, it does not comprise of a complete solution that may be instantly converted to a code component, rather it provides a framework for how to solve a problem. (More...)

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