Does a Subclass need to have a constructor? Yes, the subclass has its own constructor , either explicit or implicitly created.
Read moreWhat is the use of subclass constructor?
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 moreDo subclasses 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.
Read moreDoes a subclass constructor need to use super?
It is required if the parameterized constructor (a constructor that takes arguments) of the superclass has to be called from the subclass constructor . The parameterized super() must always be the first statement in the body of the constructor of the subclass, otherwise, we get a compilation error.
Read moreDo subclasses need super?
You need a call to super() if and only if there’s no default constructor (accepting no arguments) for your parent class . In all other cases (where a constructor with zero arguments exists) you don#t have to code it.
Read moreWhat happens if you do not call super () in the subclass 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 . If the superclass does not have a no-argument constructor, you will get a compile-time error.
Read moreWhat happens if a child class constructor doesn’t have a super () method?
If we call “super()” without any superclass Actually, nothing will be displayed . Since the class named Object is the superclass of all classes in Java. If you call “super()” without any superclass, Internally, the default constructor of the Object class will be invoked (which displays nothing).2 Tem 2019
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