What Happens If We Add Return Type To Constructor?

Can constructor throw exception?

Yes, constructors are allowed to throw an exception in Java.

A Constructor is a special type of a method that is used to initialize the object and it is used to create an object of a class using the new keyword, where an object is also known as an Instance of a class..

Why constructor has no return type not void?

Constructor is internally a nonstatic method with name and void return type. It does not return anything. … Object is not allocated with constructor itself. In other words the syntax new Object() not only calls the constructor but also creates new object and after calling the constructor returns it.

Why do we use constructor?

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.

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 a constructor have a return type C++?

1) Constructor doesn’t have a return type. Member function has a return type. 2) Constructor is automatically called when we create the object of the class. … 3) When we do not create any constructor in our class, C++ compiler generates a default constructor and insert it into our code.

Why do we need parameterized constructor?

The purpose of a parameterized constructor is to assign user-wanted specific values to the instance variables of different objects. A parameterized constructor is written explicitly by a programmer.

How many constructors can a class have?

You can have 65535 constructors in a class(According to Oracle docs).

How many objects can be returned at once?

one objectExplanation: Only one object can be returned at a time. This is because a function is only capable of returning a single value at a time. Though array of objects can be returned from a function.

How do you call a constructor?

Invoking a constructor from a method No, you cannot call a constructor from a method. The only place from which you can invoke constructors using “this()” or, “super()” is the first line of another constructor. If you try to invoke constructors explicitly elsewhere, a compile time error will be generated.

Can constructor return a value in C++?

Constructors are functions that do not return a value. The family of functions that do not return a value consists of: void functions, constructors and destructors. It is stated in 6.6. 3/2 in the C++ standard.

Is constructor inherited?

A subclass inherits all the members (fields, methods, and nested classes) from its superclass. Constructors are not members, so they are not inherited by subclasses, but the constructor of the superclass can be invoked from the subclass.

Can a class have multiple constructors?

There can be multiple constructors in a class. However, the parameter list of the constructors should not be same. This is known as constructor overloading.

What happens if we add return type to constructor *?

If you keep a return of a constructor then that will be treated as a normal method and it will not execute while creating an object of the class. You need to access that method by using an object.

Can constructor can take any number of parameters?

You can use any data type for a parameter of a method or a constructor. This includes primitive data types, such as doubles, floats, and integers, as you saw in the computePayment method, and reference data types, such as objects and arrays.

What type of constructor Cannot have a return type?

implicit return typeThe implicit return type by default is the class type in which it is declared. No. A constructor can not return a value because a constructor completely replaces the reference ID of an object, and as a constructor is also a method and a method can’t return more than one values.

What does constructor return in C++?

6 Answers. A constructor doesn’t return anything. A constructor is called to initialize an object. A constructor can only be used to initialize an object; you can’t actually call a constructor explicitly (for one thing, constructors do not have names).

Can we use return in constructor?

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.

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.