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.18 Mar 2014
Read moreCan a subclass have its own method?
A subclass can do more than that; it can define a method that has exactly the same method signature (name and argument types) as a method in its superclass .
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 need to have a constructor quizlet?
Does a Subclass need to have a constructor? Yes, the subclass has its own constructor , either explicit or implicitly created.
Read moreCan a class work without a constructor?
The compiler automatically provides a public no-argument constructor for any class without constructors . This is called the default constructor. If we do explicitly declare a constructor of any form, then this automatic insertion by the compiler won’t occur.
Read moreWhat if superclass has no constructor?
If the parent has no constructor (Object does have one), the compiler will reject the program . But then, Object is a (direct or indirect) superclass of every class in Java. Suppose, we have a class A , which does not extend any class explicitly, so it implicitly extends Object .
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