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Does Java has a default copy constructor as C++? If it has one - does it remain usable if I declare another constructor (not a copy constructor) explicitly?
This question already has an answer here:
Does Java has a default copy constructor as C++? If it has one - does it remain usable if I declare another constructor (not a copy constructor) explicitly?
There is a copy constructor (But not default one), but it should be called explicitly (In C++ it'll be implicitly called when needed):
Like C++, Java also supports copy constructor. But, unlike C++, Java doesn’t create a default copy constructor if you don’t write your own.
Also see write a Copy Constructor using Deep copy.
Java does not have bulit-in copy constructors.
But you can write your own such constructors. See an example below:
In Java the provision of an automatic copy constructor would be pointless.
Java doesn't need one since you can only have references to objects. (In C++ you can pass objects round by value so the grammar needs to allow for an automatic object copy).
If you need to take deep copies of object in Java, then implement
Cloneable
.Java does not have a default copy constructor. You'll need to define it yourself.
No, it doesn't have a default copy constructor. A default constructor.
Usually I provide a one like,