Quick Answer: Which Type Of Constructor Can’T Have A Return Type?

Which constructor is called while assigning some object with another?

3.

Which constructor is called while assigning some object with another.

Explanation: Copy constructor is used while an object is assigned with another..

Can a constructor be 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.

How do you call a constructor?

It will be invoked at the time of object creation.//Java Program to create and call a default constructor.class Bike1{//creating a default constructor.Bike1(){System.out.println(“Bike is created”);}//main method.public static void main(String args[]){//calling a default constructor.Bike1 b=new Bike1();More items…

Can method be overloaded?

Overloaded methods are differentiated based on the number and type of the parameters passed as an arguments to the methods. … You can not define more than one method with the same name, Order and the type of the arguments.

How are this () and super () used with constructors?

super() as well as this() both are used to make constructor calls. super() is used to call Base class’s constructor(i.e, Parent’s class) while this() is used to call current class’s constructor. super() is use to call Base class’s(Parent class’s) constructor.

What is the difference between the default constructor and the overloaded constructor?

Default constructor is created only if there are no constructors. If you define any constructor for your class, no default constructor is automatically created. … A default constructor is one that doesn’t need to be given arguments, either because it doesn’t have any, or the ones it has have default values.

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.

What is Setattr () used for?

The setattr() function sets the value of the specified attribute of the specified object.

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.

What happens if constructor has a return type?

Since constructor can only return the object to class, it’s implicitly done by java runtime and we are not supposed to add a return type to it. If we add a return type to a constructor, then it will become a method of the class. This is the way java runtime distinguish between a normal method and a constructor.

Which type of constructor can’t have a return type?

No, constructor does not have any return type in Java. Constructor looks like method but it is not. It does not have a return type and its name is same as the class name. Mostly it is used to instantiate the instance variables of a class.

Can constructor be overloaded?

Yes! Java supports constructor overloading. In constructor loading, we create multiple constructors with the same name but with different parameters types or with different no of parameters.

Which constructor Cannot be overloaded?

Can constructors be overloaded in derived class? Explanation: The constructor must be having the same name as that of a class. Hence a constructor of one class can’t even be defined in another class. Since the constructors can’t be defined in derived class, it can’t be overloaded too, in derived class.

Does 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.

Can constructor 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 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. … Explanation: No instance can be created of abstract class.

Can constructor have void return type?

Note that the constructor name must match the class name, and it cannot have a return type (like void ). Also note that the constructor is called when the object is created. All classes have constructors by default: if you do not create a class constructor yourself, Java creates one for you.

Can we use this () and super () in a method?

this() and super(), both are the constructors that’s why must be the first statement. But we can use both in a program. this(): It is used to call, same class Default or Parametrized Constructor. super(): It is used to call, immediate super/parent class Default or Parametrized Constructor.