- Can a main () method be declared final?
- What happens if a user forgets to define a constructor inside a class?
- Does constructor return any value in C++?
- Can we declare a constructor final?
- Can a destructor return a value?
- Can constructor be overloaded?
- Can we overload the destructor?
- Why do we need destructor?
- Can constructor return value with reason?
- Which method does not return any value?
- Can we declare constructor as private?
- How many times destructor is called?
- What is the purpose of a constructor?
- What is the purpose of default constructor?
- What happens if you keep a return type for a constructor?
- What would be the behavior if constructor has a return type?
- Can we inherit a constructor?
- Why we Cannot make constructor final?
Can a main () method be declared final?
Yes, we can declare the main () method as final in Java.
The compiler does not throw any error.
The main use of the final method in Java is they are not overridden.
We can not override final methods in subclasses..
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. 3. What is a copy constructor?
Does constructor return any 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.
Can we declare a constructor final?
No, a constructor can’t be made final. A final method cannot be overridden by any subclasses. As mentioned previously, the final modifier prevents a method from being modified in a subclass.
Can a destructor return a value?
Declaring destructors Do not return a value (or void ). Cannot be declared as const , volatile , or static . However, they can be invoked for the destruction of objects declared as const , volatile , or static .
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.
Can we overload the destructor?
The reason why you can’t overload a destructor is because your code wouldn’t have a clue about which destructor it needs to call when you destroy an object. Unless you’re calling destructors badly but then you’re behaving badly! 😉 You can’t! Each class can only have one destructor.
Why do we need destructor?
Destructors are usually used to deallocate memory and do other cleanup for a class object and its class members when the object is destroyed. A destructor is called for a class object when that object passes out of scope or is explicitly deleted. … A destructor can be declared virtual or pure virtual .
Can constructor return value with reason?
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.
Which method does not return any value?
voidWithin the body of the method, you use the return statement to return the value. Any method declared void doesn’t return a value. It does not need to contain a return statement, but it may do so.
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.
How many times destructor is called?
The destructor is being called three times, for a , lol and b . In your case, a and b are instantiated using the default constructor .
What is the purpose of a 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.
What is the purpose of default constructor?
Q) What is the purpose of a default constructor? The default constructor is used to provide the default values to the object like 0, null, etc., depending on the type.
What happens if you keep a return type for a constructor?
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.
What would be the behavior if constructor has a return type?
Explanation: The constructor cannot have a return type. It should create and return new objects. Hence it would give a compilation error. … Explanation: Constructor returns a new object with variables defined as in the class.
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 we Cannot make constructor final?
A constructor is never inherited to an another class so it doesn’t need to be marked final. Hey, The constructor cannot be final because the constructor cannot be inherited and in constructor values are initialized to the variable so by this variables changes every time and yes it cannot be inherited.