Can we call subclass constructor from superclass constructor?
Then, how can a subclass constructor call a superclass constructor?
The constructors of the subclass can initialize only the instance variables of the subclass. Thus, when a subclass object is instantiated the subclass object must also automatically execute one of the constructors of the superclass. To call a superclass constructor the super keyword is used.
Beside above, can we inherit constructor of super class? 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. A constructor may only be called with new . It cannot be called as a method.
Beside this, can we call a superclass constructor from the class constructor?
Call to super() must be first statement in Derived(Student) Class constructor. If a constructor does not explicitly invoke a superclass constructor, the Java compiler automatically inserts a call to the no-argument constructor of the superclass. It is called constructor chaining..
Do you have to call super in constructor?
There is an implicit call to super() with no arguments for all classes that have a parent - which is every user defined class in Java - so calling it explicitly is usually not required. However, you may use the call to super() with arguments if the parent's constructor takes parameters, and you wish to specify them.