- Can you use this () and super () both in a constructor?
- What is constructor overloading give example?
- What happens if there is no constructor?
- Can we override constructor in C++?
- Can a class run without constructor?
- Can we make constructor static?
- Can constructor be private?
- Why can’t a constructor be final?
- Can we have two constructors in a class?
- How do you override a constructor?
- Can we inherit constructor?
- What happens if constructor of class A is made private?
Can you use this () and super () both in a constructor?
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..
What is constructor overloading give example?
Constructor overloading is a concept of having more than one constructor with different parameters list, in such a way so that each constructor performs a different task. For e.g. Vector class has 4 types of constructors.
What happens if there is no constructor?
Question: What happens if you do not provide a constructor? Answer: … If you do not include a constructor, the Java compiler will create a default constructor in the byte code with an empty argument.
Can we override constructor in C++?
No , constructor can never be overridden . It’s because constructor acts at class level and it’s unique for each class created in Java or any Oop language. Constructor can only be accessed by other classes to create it’s object , but cant override it.
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.
Can we make constructor 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.
Can 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.
Why can’t a constructor be final?
No, a constructor can’t be made final. A final method cannot be overridden by any subclasses. … But, in inheritance sub class inherits the members of a super class except constructors. In other words, constructors cannot be inherited in Java therefore, there is no need to write final before constructors.
Can we have two constructors in a class?
There can be multiple constructors in a class. However, the parameter list of the constructors should not be same. This is known as constructor overloading.
How do you override a constructor?
Cannot override constructor. Constructor can be regarded as static, subclass cannot override its super constructor. Of course, you could call protected-method in super class constructor, then overide it in subclass to change super class constructor.
Can we inherit constructor?
A subclass inherits all the members (fields, methods, and nested classes) from its superclass. Constructors are not members, so they are not inherited by subclasses, but the constructor of the superclass can be invoked from the subclass.
What happens if constructor of class A is made private?
Constructor is used for object creation and initialization. If constructor is declared private that means constructor cannot be called outside the scope of class . so the objects of class having private constructor can neither be created nor can be initialized.