Computer Science Canada Map -> Arraylist |
| Author: | Pockets [ Mon Nov 10, 2008 2:05 am ] |
| Post subject: | Map -> Arraylist |
Is there a method out there to strip out the keys to a Map and return an ArrayList of all the elements? In the context here, the keys are unimportant and can be discarded. |
|
| Author: | DemonWasp [ Mon Nov 10, 2008 9:51 am ] | ||
| Post subject: | RE:Map -> Arraylist | ||
Without speaking to any kind of efficiency concern, you could use:
to get an array. Array -> ArrayList is trivial too. |
|||
| Author: | OneOffDriveByPoster [ Mon Nov 10, 2008 10:11 am ] | ||
| Post subject: | Re: RE:Map -> Arraylist | ||
DemonWasp @ Mon Nov 10, 2008 9:51 am wrote:
|
|||
| Author: | Pockets [ Mon Nov 10, 2008 4:35 pm ] |
| Post subject: | Re: Map -> Arraylist |
Yeah, it's for a game of hearts. We're handed a trick as a map of <playerID strings, Card objects>, and I need to strip the card objects into a simple array for use in a card counting function. I may just use a manual iterator though. |
|
| Author: | OneOffDriveByPoster [ Mon Nov 10, 2008 4:56 pm ] |
| Post subject: | Re: Map -> Arraylist |
Pockets @ Mon Nov 10, 2008 4:35 pm wrote: I may just use a manual iterator though. This is probably a cleanest thing to do. If you are not sure you will always have a Map, then use a Iterator from Map.values(). Not sure why you wanted an ArrayList specifically. Map.values() will give you a Collection view of the map's values. Your algorithm might not need to have something as specific as ArrayList. |
|