Automatic insertion of super class constructor call When an object is created, it’s necessary to call the constructors of all super classes to initialize their fields. Java does this automatically at the beginning if you don’t .
Read moreHow does super constructor work in Java?
super() calls the parent constructor with no arguments . It can be used also with arguments. I.e. super(argument1) and it will call the constructor that accepts 1 parameter of the type of argument1 (if exists).
Read moreDoes a superclass need a constructor?
A subclass needs a constructor if the superclass does not have a default constructor (or has one that is not accessible to the subclass). If the subclass has no constructor at all, the compiler will automatically create a public constructor that simply calls through to the default constructor of the superclass.
Read moreWhat are abstract classes in Java?
Abstract class: is a restricted class that cannot be used to create objects (to access it, it must be inherited from another class). Abstract method: can only be used in an abstract class, and it does not have a body. The body is provided by the subclass (inherited from).
Read moreWhat are the properties of abstract class in Java?
Abstract class in Java
Read moreCan abstract classes have instance fields?
Abstract classes can have instance variables (these are inherited by child classes). Interfaces can’t. Finally, a concrete class can only extend one class (abstract or otherwise).
Read moreCan Java abstract classes have fields?
An abstract class may have static fields and static methods. You can use these static members with a class reference (for example, AbstractClass.
Read more