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Java class without constructor

What is the purpose of a default constructor when must the developer provide the constructor explicitly?

1 April 2022 Enpatika.com Genel

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.

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Is it mandatory to have default constructor?

1 April 2022 Enpatika.com Genel

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 .

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Why is it important to provide a default constructor in Java What happens if your class doesn’t have a no argument constructor?

1 April 2022 Enpatika.com Genel

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 .

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Is it always necessary to provide a default constructor for a class Why or why not?

1 April 2022 Enpatika.com Genel

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.

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Can I create a class without constructor?

1 April 2022 Enpatika.com Genel

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.

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What happens if you don’t create a constructor for a class C++?

1 April 2022 Enpatika.com Genel

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.

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Can C++ class have no constructor?

1 April 2022 Enpatika.com Genel

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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