Advantages of copy constructor in Java

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Class A is flexible and safe : you create a copy from any A object you have, even if it’s a temporary one. Class B is less safe as you could invoke the constructor with a nullptr . It’s less flexible because you can only use ypur constructor to copy an object from which you can get the address and which is not const.3 Eyl 2015

What is a Copy Constructor? A constructor in C++ is used to initialize an object . A copy constructor is a member function of a class that initializes an object with an existing object of the same class. In other words, it creates an exact copy of an already existing object and stores it into a new object.

A user-defined copy constructor is generally needed when an object owns pointers or non-shareable references, such as to a file, in which case a destructor and an assignment operator should also be written (see Rule of three).