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 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 .
Read moreIs super class constructor always called?
Before you can initialize an object in a constructor, the object’s parent constructor must be called first. … The compiler automatically inserts superclass constructor calls in both constructors .
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