No, constructor does not return any value. While declaring a constructor you will not have anything like return type. In general, Constructor is implicitly called at the time of instantiation. And it is not a method, its sole purpose is to initialize the instance variables.
Then, what happens if you keep a return type for a constructor?
Constructors have no return type. When you create a object so constructor will automatically call according to which object is call. Because constructor can also overload. So it show an compiler error when you create a return type.
Additionally, can copy constructor return anything? Copy Constructor: A copy constructor IS a constructor, so it is a function with the same name as the class and no return type (just like any constructor). However, it is invoked implicitly when something is done that causes a COPY of an existing object to be created.
Hereof, what would be Behaviour if constructor has a return type?
A Constructor always must have the same name as the class. A Constructor cannot have a return type, hence it doesn't return a value. A constructor may have any access modifier like private, protected, default, public.
Is constructor inherited?
Constructors are not members of classes and only members are inherited. You cannot inherit a constructor. That is, you cannot create a instance of a subclass using a constructor of one of it's superclasses.
Can a constructor be private?
Yes, class can have a private constructor. It is needed as to disallow to access the constructor from other classes and remain it accessible within defined class. A singleton is a design pattern that allows only one instance of your class to be created, and this can be accomplished by using a private constructor.Why a return type is not allowed for constructor?
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. Its return value (if it actually has one when compiled down to machine code) is opaque to the user - therefore, you can't specify it.Can final class have constructor?
A final class cannot be extended, but its constructor can be public. A private constructor can be called from another constructor or used by an inner class.Can we declare a constructor final?
No Constructors can NEVER be declared as final. Your compiler will always give an error of the type "modifier final not allowed" Final, when applied to methods, means that the method cannot be overridden in a subclass. Constructors are NOT ordinary methods. So there is NO SENSE in declaring it final.Does constructor return any value in C#?
Constructors do not have a return type, but you can pass values by reference using the ref keyword. It would be better to throw an exception from the constructor to indicate a validation failure. Make a Constructor with Out parameter and send your return value via same.What is false constructor?
What is false about constructor? Explanation: Default, parameterised constructors can be defined. Explanation: Constructor returns a new object with variables defined as in the class. Instance variables are newly created and only one copy of static variables are created.How many constructors can a class have?
You can have 65535 constructors in a class(According to Oracle docs). But IMPORTANTLY keep this in your mind. We achieve this only by CONSTRUCTOR OVERLOADING ( constructor-overloading/ ). You can create many constructors but with different signatures.Can we have this () and super () together?
Both this() and super() are constructor calls. Constructor call must always be the first statement. So we can not have two statements as first statement, hence either we can call super() or we can call this() from the constructor, but not both.Why does constructor have a 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. Its return value (if it actually has one when compiled down to machine code) is opaque to the user - therefore, you can't specify it.Is constructor by default final?
apply a final keyword to a method means you cannot override that method. but by default in java no constructor can be overridden. so there is no need to use final keyword with a constructor . A constructor can't inherited so can't be overridden , so there is no use of making constructor final.What are the six ways to use this keyword?
What are the 6 ways to use this keyword in Java?- this can be used to get the current object.
- this can be used to invoke current object's method.
- this() can be used to invoke current class constructor.
- this can be passed as a parameter to a method call.
- this can be passed as a parameter to a constructor.
- this can be used to return the current object from the method.
