Question: What Happens If We Make Constructor As Private?

Can constructor has 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..

Is a constructor a void method?

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

Can a constructor be 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.

Why is copy constructor called reference?

It is necessary to pass object as reference and not by value because if you pass it by value its copy is constructed using the copy constructor. This means the copy constructor would call itself to make copy. This process will go on until the compiler runs out of memory.

Should a constructor be public or private?

No, Constructors can be public , private , protected or default (no access modifier at all). Making something private doesn’t mean nobody can access it. It just means that nobody outside the class can access it. So private constructor is useful too.

Are constructors always public?

No, Constructors can be public , private , protected or default (no access modifier at all). Making something private doesn’t mean nobody can access it. It just means that nobody outside the class can access it. … Using private constructor we can ensure that no more than one object can be created at a time.

Can a constructor throw an 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.

Can a constructor be static?

No, we cannot define a static constructor in Java, If we are trying to define a constructor with the static keyword a compile-time error will occur. In general, static means class level. A constructor will be used to assign initial values for the instance variables.

Why constructor has no 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. … The whole purpose of constructor is to initialize the current state of the object by setting the initial values.

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

7. What happens if a user forgets to define a constructor inside a class? Explanation: The C++ compiler always provides a default constructor if one forgets to define a constructor inside a class.

What is the benefit of copy constructor?

The copy constructor and assignment operators are used to create a copy of the object. In some cases, the copy constructor is implicitly called by the compiler, such as when the object is passed by value. Advantages: Copy constructors make it easy to copy objects.

What happens if we add return type to 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.

Can a constructor be overloaded?

For classes, constructor overloading provides both the convenience and power of being able to instantiate the same type of object using different sets of initial data. Note, however, that only instance constructors support overloading, as a class can have only one static constructor.

Why would you make a constructor private?

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. If all the methods in the class are static, consider making the complete class static.

Can a copy constructor be made private?

Yes, a copy constructor can be made private. When we make a copy constructor private in a class, objects of that class become non-copyable.