Quick Answer: Can We Use Return In Constructor?

Does return type void?

______________ have the return type void.

Explanation: Constructor creates an Object and Destructor destroys the object.

They are not supposed to return anything, not even void.

Explanation: There are no void objects..

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.

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 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 we write return statement in constructor in Java?

There are no “return value” statements in constructor, but constructor returns current class instance. We can write ‘return’ inside a constructor. Like methods, we can overload constructors for creating objects in different ways.

Can we use return in void function?

Void functions are created and used just like value-returning functions except they do not return a value after the function executes. … You may or may not use the return statement, as there is no return value. Even without the return statement, control will return to the caller automatically at the end of the function.

What happens if we declare constructor as private?

The use of private constructor is to serve singleton classes. … Using private constructor we can ensure that no more than one object can be created at a time. By providing a private constructor you prevent class instances from being created in any place other than this very class.

Can you return in a 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.

What is the purpose of private constructor?

Private constructors are used to prevent creating instances of a class when there are no instance fields or methods, such as the Math class, or when a method is called to obtain an instance of a class.

How many types of constructors are there in Java?

3 typesIn Java, constructors can be divided into 3 types: No-Arg Constructor. Parameterized Constructor. Default Constructor.

What is Constructor with example?

When a class or struct is created, its constructor is called. Constructors have the same name as the class or struct, and they usually initialize the data members of the new object. In the following example, a class named Taxi is defined by using a simple constructor.

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.

Can we override private methods?

No, we cannot override private or static methods in Java. Private methods in Java are not visible to any other class which limits their scope to the class in which they are declared.

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.

Can constructor take any number of parameters?

A Java class constructor initializes instances (objects) of that class. Typically, the constructor initializes the fields of the object that need initialization. Java constructors can also take parameters, so fields can be initialized in the object at creation time.

Is constructor inherited?

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

What is the difference between return 0 and return?

In other words: 0 (zero) is a value, which is not the same thing as the absence of a value. … When you write return you are actually returning void value and you are simply returning 0 when you write return 0. So, you generally use return 0 when return type is int and return when return type is void.

Which procedure do not return a value?

A Sub procedure does not return a value to the calling code. You call it explicitly with a stand-alone calling statement. You cannot call it by simply using its name within an expression.