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 we create object in C++ without new?
In C++, we can instantiate the class object with or without using the new keyword. If the new keyword is not use, then it is like normal object. This will be stored at the stack section. This will be destroyed when the scope ends.
Read moreCan we create an object without constructor in C++?
Defining a class without a constructor but with a destructor is perfectly legal C++, but is not recommended. Your compiler will try to generate a default constructor for you, which will automatically call the default constructor of all members in your class.
Read moreCan I create object without constructor?
Actually, yes, it is possible to bypass the constructor when you instantiate an object, if you use objenesis to instantiate the object for you . It does bytecode manipulations to achieve this. Deserializing an object will also bypass the constructor.
Read moreShould I delete default constructor C++?
Deleting the default constructor of a class is a good idea when there are multiple choices for the default or uninitialised state .
Read moreAre default constructors necessary?
The compiler-defined default constructor is required to do certain initialization of class internals . It will not touch the data members or plain old data types (aggregates like an array, structures, etc…). However, the compiler generates code for the default constructor based on the situation.9 Oca 2022
Read moreShould I write default constructor?
You should only implement your own default constructor it it does anything else then the one the compiler would generate. If you want to give the reader a hint, you can replace the implementation with = default in C++11.
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