Why Constructor Has No Return Type?

Can a constructor be void?

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..

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.

What happens if a user forgets to define a constructor inside a class?

Also if any user forgets to define init() function then no object will be initialized whereas if any constructor is not defined in any class the class provides a default constructor for initialization. … d) A constructor to kill other copies of a given object.

Can a constructor call another constructor?

Yes, any number of constructors can be present in a class and they can be called by another constructor using this() [Please do not confuse this() constructor call with this keyword]. this() or this(args) should be the first line in the constructor. This is known as constructor overloading.

Can a constructor have a return type?

No, constructor does not have any return type in Java. … 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. If the programmer doesn’t write a constructor the compiler writes a constructors on his behalf.

Can we inherit a constructor?

Constructors are not members, so they are not inherited by subclasses, but the constructor of the superclass can be invoked from the subclass.

Why do we need 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.

How many constructors can a class have?

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

What happens if you keep a return type for a constructor?

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 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.

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.

Does every class need a constructor?

Java doesn’t require a constructor when we create a class. … The compiler automatically provides a public no-argument constructor for any class without constructors. This is called the default constructor. If we do explicitly declare a constructor of any form, then this automatic insertion by the compiler won’t occur.

What is a no argument constructor?

No-argument constructor: A constructor that has no parameter is known as default constructor. If we don’t define a constructor in a class, then compiler creates default constructor(with no arguments) for the class. … If we want to initialize fields of the class with your own values, then use a parameterized constructor.

Does constructor return value?

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.

What will happen if a constructor is defined with a return type?

Explanation: The constructor cannot have a return type. It should create and return new objects. … 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.

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.

Can a class run without constructor?

It is possible for a class to have no constructor. (An important distinction to draw here is that the JVM does not require all class files to have a constructor; however, any class defined in Java does have a default constructor if a constructor is not explicitly declared.

Do constructors return void?

Because constructor function returns the object it creates, not Void.