Subclass Constructors. This constructor explicitly initializes the cx and cy fields newly defined by PlaneCircle, but it relies on the superclass Circle() constructor to initialize the inherited fields of the class . To invoke the superclass constructor, our constructor calls super(). super is a reserved word in Java.
Read moreCan we use constructor in subclass?
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.
Read moreDo you need a constructor for a subclass?
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 moreDo Superclasses need constructors?
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 moreCan constructor be inherited through a subclass that calls the superclass constructor?
Super class’s Constructor in inheritance In inheritance constructors are not inherited . You need to call them explicitly using the super keyword.
Read moreWhat does a class inherit when it extends another class?
Summary. As you’ve seen, inheritance is a powerful concept that enables you to implement a subclass that extends a superclass. By doing that, the subclass inherits all protected and public attributes and methods, and the types of the superclass .
Read moreDoes subclass call superclass constructor?
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. The following example programs demonstrate use of super keyword.
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