What does a protected constructor do?
Protecting a constructor prevents the users from creating the instance of the class, outside the package. During overriding, when a variable or method is protected, it can be overridden to other subclass using either a public or protected modifier only.
Can a constructor be protected C#?
Instance constructors can have public, private, protected, external, or internal modifiers.
What is the use of private constructor in C #?
Private constructors are used to prevent creating instances of a class when there are no instance fields or methods, such as the Math class, or when a method is called to obtain an instance of a class.
What happens if constructor of class A is made protected?
5. What happens if constructor of class A is made private? Explanation: If we make any class constructor private, we cannot create the instance of that class from outside the class.
What is protected class in C#?
protected: The type or member can be accessed only by code in the same class , or in a class that is derived from that class . internal: The type or member can be accessed by any code in the same assembly, but not from another assembly.
What is the true about protected constructor?
What is true about protected constructor? Explanation: Protected access modifier means that constructor can be accessed by child classes of the parent class and classes in the same package.
Can constructor be overloaded in C#?
We can overload the constructor if the number of parameters in a constructor are different.
Can a constructor be static in C#?
A class or struct can only have one static constructor. Static constructors cannot be inherited or overloaded. A static constructor cannot be called directly and is only meant to be called by the common language runtime (CLR). It is invoked automatically.
Can static class have private constructor in C#?
A static class can only have a static constructor and public/private does not apply since your code can never call this constructor (the CLR does). So you may not use a access modifier (public/private/…) on a static constructor.
What is difference between private constructor and sealed class in C#?
A sealed class cannot be inherited but it can be instantiated. On the other hand, a class having a private constructor neither can be inherited nor instantiated due to its protection level.
What is the difference between static and private constructor in C#?
1. Static constructor is called before the first instance of class is created, wheras private constructor is called after the first instance of class is created. 2. Static constructor will be executed only once, whereas private constructor is executed everytime, whenever it is called.
WHAT IS interface in C# net?
Interface in C# is a blueprint of a class. It is like abstract class because all the methods which are declared inside the interface are abstract methods. It cannot have method body and cannot be instantiated. It is used to achieve multiple inheritance which can’t be achieved by class.
Should a constructor be private?
No, Constructors can be public , private , protected or default (no access modifier at all). Making something private doesn’t mean nobody can access it. It just means that nobody outside the class can access it. So private constructor is useful too.
Can we declare constructor as private?
Yes, we can declare a constructor as private. If we declare a constructor as private we are not able to create an object of a class. We can use this private constructor in the Singleton Design Pattern.
How many arguments can be passed to main ()?
3. Number of arguments can be passed to main() is? Explanation: Infinite number of arguments can be passed to main().