This week's book giveaways are in the Java EE and JavaScript forums.
We're giving away four copies each of The Java EE 7 Tutorial Volume 1 or Volume 2(winners choice) and jQuery UI in Action and have the authors on-line!
See this thread and this one for details.
The moose likes Beginning Java and the fly likes Reset property and resuse bean Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login

Win a copy of The Java EE 7 Tutorial Volume 1 or Volume 2 this week in the Java EE forum
or jQuery UI in Action in the JavaScript forum!
JavaRanch » Java Forums » Java » Beginning Java
Bookmark "Reset property and resuse bean" Watch "Reset property and resuse bean" New topic

Reset property and resuse bean

Nitin Gaur

Joined: Sep 06, 2003
Posts: 27
Say its a simple java bean with some members and getter/setters. I create an instance of bean and call setters to set values. Now I want another copy of bean but with just one different property value. So the question is -
- Do I have to again instantiate the bean and call all setters again?
- Just call the setter for one property again and reuse the existing instance? Is this right way to do it?

Campbell Ritchie

Joined: Oct 13, 2005
Posts: 38474
If you want two instances you will need two instances. If you have one instance and reset one field, then you will lose the information about what that field was before.

How about giving your bean class a copy constructor? Then you can copy all the fields, and reset one only. Or even a clone() method call and a single field reset.
Beware: if any of those fields is a mutable reference type, then alteration to its state in one bean may be reflected in other beans with the same object in that field.
I agree. Here's the link:
subject: Reset property and resuse bean