 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
Java Forum / First Aid / May 2005return more than one object within one method
Hi newsgroup, I have a little problem with a method that tries to use another method in another class. So far this method receives an ArrayList as follows: private ArrayList bORead() { Einl e = new Einl(); bO = e.bocreate(); } This works fine, but now I would like to also receive an integer created from the method e.bocreate(). I know that the method bocreate() can only return one object, nevertheless I found some information about collections that could wrap more than one object. Does anyone know if it is possible to receive more than one object (with different object types) from one method? Any help is greatly appreciated. Thanks very much in advance and best regards! Frank > Hi newsgroup, > [quoted text clipped - 6 lines] > { > Einl e = new Einl(); WhatTypeIs bO; // ??? > bO = e.bocreate(); return bO_OrSomethingElse; // ??? > } > This works fine, but now I would like to also receive an integer created > from the method e.bocreate(). What's the return type of bocreate()? What does the integer represent? (maybe some count of matched items?) > I know that the method bocreate() can only return one object, nevertheless I > found some information about collections that could wrap more than one > object. > > Does anyone know if it is possible to receive more than one object (with > different object types) from one method? That's not possible, a method returns nothing (void), a primitive or an object (possibly null). However, you can define a new class that holds both, and bocreate() should return an instance of this class. There are other possibilities too, including the use of a collection class instance, or a 2 element Object array. > Any help is greatly appreciated. > > Thanks very much in advance and best regards! > > Frank  SignatureRegards, Roland de Ruiter ___ ___ /__/ w_/ /__/ / \ /_/ / \ Roland, > > This works fine, but now I would like to also receive an integer created > > from the method e.bocreate(). > > What's the return type of bocreate()? > What does the integer represent? (maybe some count of matched items?) By now, the bocreate() returns an ArrayList which is written to bO... sorry, my code was really misunderstandable... The integer I'd like to get from bocreate() too represents an account number, so it has nothing to do with the ArrayList already returned... > That's not possible, a method returns nothing (void), a primitive or an > object (possibly null). [quoted text clipped - 4 lines] > There are other possibilities too, including the use of a collection > class instance, or a 2 element Object array. Well, after having read some information about the Collection, I think I would use this way... which means that bocreate() has to put the ArrayList and the integer in a new Collection object and return this to bORead(), which will have to get the two out of the Collection, right? I'll try tomorrow... Many thanks so far and a very nice weekend! Best regards Frank > Roland, > [quoted text clipped - 9 lines] > The integer I'd like to get from bocreate() too represents an account > number, so it has nothing to do with the ArrayList already returned... Then it sounds like returning it should not be part of this method. Each method should only do one thing. A little test I use is to see if you can come up with a simple name for the multiple things you are trying to return without using the word "and". If not that's a red flag saying that you probably are trying to do something wrong. It sounds like you have a design problem and we can't really help you with that without understanding what it is you are trying to do in the actual program. SignatureDale King > Hi newsgroup, > [quoted text clipped - 24 lines] > > Frank You can do this if you return a Collection of Objects. For example you could have a Vector. You would need some wrapper class though to tell you what type of data each entry holds but other than that - its trivial. Allan Allan, > You can do this if you return a Collection of Objects. For example you > could have a Vector. You would need some wrapper class though to tell you > what type of data each entry holds but other than that - its trivial. guess what? I chose the Vector Object as my solution in the meanwhile... and it works :o) The only thing of importance was the usage of a Integer class object for the int value... Java can be so easy if you know ;o) A nice weekend! Best regards Frank Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
|
Reply to this Message
|
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2008 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.