- What happens if there is no constructor defined in a class?
- Why constructor has no return type?
- Can a class run without constructor?
- Can we override static method?
- Can constructor be static?
- Can we inherit constructor?
- Can abstract class have constructor?
- Which specifier applies only to the constructor?
- Can constructor be virtual?
- What do you call a constructor that accepts no arguments?
- Can we override constructor in C++?
- Can we declare constructor as protected?
What happens if there is no constructor defined in a class?
If we don’t define a constructor in a class, then compiler creates default constructor(with no arguments) for the class.
And if we write a constructor with arguments or no-arguments then the compiler does not create a default constructor.
Default constructor provides the default values to the object like 0, null, etc..
Why constructor has no return type?
So the reason the constructor doesn’t return a value is because it’s not called directly by your code, it’s called by the memory allocation and object initialization code in the runtime. … The whole purpose of constructor is to initialize the current state of the object by setting the initial values.
Can a class run without constructor?
It is possible for a class to have no constructor. (An important distinction to draw here is that the JVM does not require all class files to have a constructor; however, any class defined in Java does have a default constructor if a constructor is not explicitly declared.
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 constructor be static?
A static constructor does not take access modifiers or have parameters. 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).
Can we inherit constructor?
Constructors are not members, so they are not inherited by subclasses, but the constructor of the superclass can be invoked from the subclass.
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.
Which specifier applies only to the constructor?
5. Which specifier applies only to the constructors? Explanation: The keyword explicit can be used while defining the constructor only. This is used to suppress the implicit call to the constructor.
Can 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 do you call a constructor that accepts no arguments?
In both Java and C#, a “default constructor” refers to a nullary constructor that is automatically generated by the compiler if no constructors have been defined for the class. … A programmer-defined constructor that takes no parameters is also called a default constructor in C#, but not in Java.
Can we override constructor in C++?
Constructor overriding is not possible because of following reason. Constructor name must be the same name of class name. In Inheritance practice you need to create two classes with different names hence two constructors must have different names.
Can we declare constructor as protected?
protected: If you declare constructor as protected, any other child classes or classes within the same package can instantiate this class.