Copy Constructor concept n Java

[Reddy Prasad]

Hi Friends,

I had a doubt is there any concept like copy constructor in Java like C++. If it is there, how can it be performed in Java.Please give the reply with example.


Thanks and Regards,
Prasad

[Stan James]

Hi, welcome to the ranch!!

Would that look like this?

Widget newWidget = new Widget( oldWidget );

You can certainly write the code to make the constructor copy the appropriate fields from old to new, but it's not there automatically. I think the only one of these I've used in the wild is the Attributes object in the XML DOM.

oldWidget.clone() might be an alternative. The object must be written to clone properly. The code would look an awful lot like the copy constructor as it copies each field from old to new. Look at the doc for clone() on the Object class.

Either way, if you're writing the copy code it will be your choice whether to make deep copies or not.

[Bear Bibeault]

This forum is for questions on JDBC. I've moved this topic to a more appropriate forum: Java in General (beginner).

[Ernest Friedman-Hill]

Strangely enough, we had a discussion about this just this morning!

[Jeroen T Wenting]

hardly strange, a new course period has AFAIK started at many schools...