static Vs class with private constructor

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i have google net very much .. and have some confusion about one thing ....

sealed class- can not inherit these class but create instances

static class- can not create instance and can not inherit them

class with private constructor - can not create instances outside the class . and can not inherit them

abstract class - can not create instance but inherit as a base class .

than whats the use of class with private constructor when same behavior is available in static class . is it only that we create instance of class with private constructor inside the class ..

can any one clear it

Posted 2-Dec-14 23:16pm

Gaurav Dixit

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3 solutions

Solution 2

Here is the difference.

Class with private constructor:-

1. You can still have another public constructor to instantiate the class.
2. Private construtor is called every time class has been instantiated.

Static Class:-

1. You cann't instantiate at all.
2. Static constructor is called only once while class is loaded into the memory. or referenced first.

Posted 3-Dec-14 5:54am

sushil_gupta

Solution 3

You can't avail the benefits of all beauty of inheritance but able to achieve the same by using private constructor with static public property (i.e. singleton).

Posted 3-Dec-14 8:25am

Badal Kumar

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CPallini · Accepted Answer · 2014-12-02T23:24:00

Solution 1

You can't get an instance of a static class while you can get instances of a class having private constructor via static methods.
Private constructor is used, for instance, in the Singleton design pattern (see, for istance "Implementing Singleton in C#"[^]).

Posted 2-Dec-14 23:24pm

CPallini

Comments

Gaurav Dixit 3-Dec-14 5:35am

is there no use of private constructor in traditional asp.net ?