In both Java and C#, a “default constructor” refers to a nullary constructor that is automatically generated by the compiler if no constructors have been defined for the class . The default constructor implicitly calls the superclass’s nullary constructor, then executes an empty body.
Read moreIs it mandatory to have default constructor?
The compiler doesn’t ever enforce the existence of a default constructor. You can have any kind of constructor as you wish. For some libraries or frameworks it might be necessary for a class to have a default constructor, but that is not enforced by the compiler .
Read moreWhy is it important to provide a default constructor in Java What happens if your class doesn’t have a no argument constructor?
The arguments of a constructor can only be found by type, not by name, so there is no way for the framework to reliably match properties to constructor args. Therefore, they require a no-arg constructor to create the object, then can use the setter methods to initialise the data .
Read moreIs it always necessary to provide a default constructor for a class Why or why not?
If a class is not required to initialize its data member or does not contain data member, there is no need to write empty constructor explicitly . On class object creation, default constructor implicitly called will be enough. In below class, default constructor will be called on object creation of the class.
Read moreWhat happens if you don’t create a constructor for a class C++?
In C++, the compiler creates a default constructor if we don’t define our own constructor. In C++, compiler created default constructor has an empty body, i.e., it doesn’t assign default values to data members.
Read moreCan I create a class without constructor?
It is possible for a class to have no constructor . (An important distinction to draw here is that the JVM does not require all class files to have a constructor; however, any class defined in Java does have a default constructor if a constructor is not explicitly declared.
Read moreCan C++ class have no constructor?
If your class has no constructors, C++ will automatically generate a public default constructor for you . This is sometimes called an implicit constructor (or implicitly generated constructor). The Date class has no constructors.5 Eyl 2007
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