If no user-defined constructor exists for a class A and one is needed, the compiler implicitly declares a default parameterless constructor A::A() . This constructor is an inline public member of its class.
Read moreDoes base class need a default constructor?
A derived class can only be constructed once all base class’ are fully constructed. So it doesn’t matter if you call the base class’ constructor or not . If you don’t call, as long as there is a default constructor available for compiler to determine, it will be called. Otherwise compiler will throw error.
Read moreCan a class have no default constructor?
Not having a default constructor is no problem, as long as you don’t use one . Always specifying an argument at construction is ok, when there is no obvious default argument.11 Kas 2011
Read moreCan a default constructor be empty?
Providing an empty default constructor( private ) is necessary in those cases when you don’t want an object of the class in the whole program . For e.g. the class given below will have a compiler generated default empty constructor as a public member . As a result, you can make an object of such a class.
Read moreCan you have a blank constructor in Java?
You don’t have to define a constructor for a class, but if you don’t define any constructor, the Java compiler will insert a default, no-argument constructor for you .
Read moreWhy do we create an empty constructor in Java?
8 Answers. An empty constructor is needed to create a new instance via reflection by your persistence framework . If you don’t provide any additional constructors with arguments for the class, you don’t need to provide an empty constructor because you get one per default.
Read moreDoes Java need an empty constructor?
Every tutorial I saw said : every entity needs an empty constructor . But Java always give you a default invisible empty constructor (if you don’t redefine one). … But Java always gives you this empty constructor when you don’t redefine it (write an other one with parameters).
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