- Can a constructor be final?
- Can we declare constructor as private?
- Can copy constructor be private?
- Can abstract class have constructor?
- Can constructor be static in C++?
- Can a constructor be virtual?
- What is difference between static constructor and private constructor?
- Can a constructor be abstract?
- Can constructor be static or final?
- Can we declare constructor as static?
- Why constructor is non static?
- Can we override static method?
- Can we have static constructor in non static class?
- Why static methods Cannot be inherited?
- Can a constructor be overridden?
Can a constructor be final?
No, a constructor can’t be made final.
A final method cannot be overridden by any subclasses.
In other words, constructors cannot be inherited in Java therefore, there is no need to write final before constructors..
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.
Can copy constructor be private?
Yes, a copy constructor can be made private. When we make a copy constructor private in a class, objects of that class become non-copyable.
Can abstract class have constructor?
Yes! Abstract classes can have constructors! Yes, when we define a class to be an Abstract Class it cannot be instantiated but that does not mean an Abstract class cannot have a constructor. Each abstract class must have a concrete subclass which will implement the abstract methods of that abstract class.
Can constructor be static in C++?
4 Answers. The purpose of a constructor is to initialize the contents of an instance of the class. Static methods don’t have an instance associated with them. Hence there is no such thing as a static constructor.
Can a constructor be virtual?
In C++, the constructor cannot be virtual, because when a constructor of a class is executed there is no virtual table in the memory, means no virtual pointer defined yet. So, the constructor should always be non-virtual. But virtual destructor is possible.
What is difference between static constructor and private constructor?
Static Constructor executes by the CLR not by the object of a class. … However, Private Constructor is used to restrict a class to be instantiated and to be inherited. Private Constructor is used whenever a class contains only static members.
Can a constructor be abstract?
You can’t have an abstract constructor, as abstract means you need to provide the implementation for that at some point of time in your subclass. But you cannot override constructor. There will be no point in having an abstract constructor : Since the constructor needs to be of the same name as of class.
Can constructor be static or final?
The static , final and abstract keywords are not meaningful for a constructor because: static members belong to a class, but the constructor is needed to create an object. An abstract class is a partially implemented class, which contains abstract methods to be implemented in child class.
Can we declare constructor as static?
No, we cannot define a static constructor in Java, If we are trying to define a constructor with the static keyword a compile-time error will occur. In general, static means class level. A constructor will be used to assign initial values for the instance variables.
Why constructor is non static?
This is the reason why constructor cannot be static – Because if we make them static they cannot be called from child class thus object of child class cannot be created. … If you made constructor as static then the constructor will be called before object creation same like main method.
Can we override static method?
Can we Override static methods in java? We can declare static methods with the same signature in the subclass, but it is not considered overriding as there won’t be any run-time polymorphism. Hence the answer is ‘No’.
Can we have static constructor in non static class?
A non-static class can contain one parameterless static constructor. Parameterized static constructors are not allowed. Static constructor will be executed only once in the lifetime. So, you cannot determine when it will get called in an application if a class is being used at multiple places.
Why static methods Cannot be inherited?
Static methods in Java are inherited, but can not be overridden. If you declare the same method in a subclass, you hide the superclass method instead of overriding it. Static methods are not polymorphic. At the compile time, the static method will be statically linked.
Can a constructor be overridden?
Constructor looks like method but it is not. It does not have a return type and its name is same as the class name. But, a constructor cannot be overridden. If you try to write a super class’s constructor in the sub class compiler treats it as a method and expects a return type and generates a compile time error.