Similarly, you may ask, can a constructor have a return value Java?
Constructors cannot return a value; they return the constructed object, so to speak. You get an error because the compiler is looking for a constructor that takes a string as its argument. Because as soon as you declare a return value/type for your method it is not a constructor anymore but a regular method.
Subsequently, question is, why 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.
Secondly, what happens if 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.
Can we write return in constructor?
Yes, using return statements in constructors is perfectly standard. Constructors are functions that do not return a value. 2 A return statement without an expression can be used only in functions that do not return a value, that is, a function with the return type void, a constructor (12.1), or a destructor (12.4).
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 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.How many types of constructors are there in Java?
There are two types of constructors in Java: no-arg constructor, and parameterized constructor.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 you make constructor 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. Therefore, java does not allow final keyword before a constructor.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 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.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.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.What is the difference between a constructor and a method?
Following are the difference between constructor and method. Constructor is used to initialize an object whereas method is used to exhibits functionality of an object. Constructors are invoked implicitly whereas methods are invoked explicitly. Constructor should be of the same name as that of class.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 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.Do constructors have a return type C++?
Constructors have no return type, not even void. This is because the implicit return type of a class' constructor is the class type itself. It is the constructor's job to initialize the internal state of an object so that the code creating an instance will have a fully initialized, usable object immediately.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 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.
