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.
Also know, can constructor return value with reason?
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.
Subsequently, question is, what is a constructor in Java with an example? A constructor is a special method that is used to initialize a newly created object and is called just after the memory is allocated for the object. If no user-defined constructor is provided for a class, compiler initializes member variables to its default values.
Also, what would happen if a constructor has a return type?
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.
Does constructor return any value in C++?
A constructor initializes an object immediately upon creation. It has the same name as the class in which it resides and is syntactically similar to a function. Once defined, the constructor is automatically called immediately after the object is created. Constructors have no return type, not even void.
Can 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.Does constructor return type?
Constructors in Java do not return anything explicitly. They do not have a return type, not even void. However, as the definition of Constructor goes, it is used to initialize an object of the class. So implicitly, they return the current instance of the class whose constructor it is.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 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.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.Why are constructors used?
The purpose of constructor is to initialize the object of a class while the purpose of a method is to perform a task by executing java code. Constructors cannot be abstract, final, static and synchronised while methods can be. Constructors do not have return types while methods do.What is constructor in OOP?
A constructor is a special method of a class or structure in object-oriented programming that initializes an object of that type. A constructor is an instance method that usually has the same name as the class, and can be used to set the values of the members of an object, either to default or to user-defined values.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.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 override static method?
Answer is, No, you can not override static method in Java, though you can declare method with same signature in sub class. It won't be overridden in exact sense, instead that is called method hiding. As per Java coding convention, static methods should be accessed by class name rather than object.What is true constructor?
What is true about constructor? 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. Abstract class cannot have a constructor.Can constructor be overloaded?
Constructor can be overloaded in a similar way as function overloading. Overloaded constructors have the same name (name of the class) but different number of arguments. Depending upon the number and type of arguments passed, specific constructor is called.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.
