Java-Gaming.org Hi !
Featured games (83)
games approved by the League of Dukes
Games in Showcase (521)
Games in Android Showcase (127)
games submitted by our members
Games in WIP (589)
games currently in development
News: Read the Java Gaming Resources, or peek at the official Java tutorials
 
    Home     Help   Search   Login   Register   
Pages: [1]
  ignore  |  Print  
  Vector into String array  (Read 865 times)
0 Members and 1 Guest are viewing this topic.
Offline Gannin

Senior Newbie





« Posted 2006-03-10 02:15:08 »

I think I used to know how to do this once upon a time, but that was a while ago.  I have a vector full of string objects, and I need to turn it into a String array.

String[] sarray = vector.toArray();

Doesn't work because the vector method is outputing an Object array instead of a String array.  I've tried casting it like this:

String[] sarray = (String[])vector.toArray();

And even though that will compile, it produces an error at run time.

Exception in thread "main" java.lang.ClassCastException: java.util.Arrays$ArrayList

Is there something simple I'm overlooking, or do I simply need to use a loop to step through the vector and assign elements to the string array element by element?  Thanks Smiley.
Offline kevglass

« JGO Spiffy Duke »


Medals: 195
Projects: 24
Exp: 18 years


Coder, Trainee Pixel Artist, Game Reviewer


« Reply #1 - Posted 2006-03-10 03:13:09 »

String[] sarray = (String[]) vector.toArray(new String[0]);

Kev

Offline zero

Junior Devvie





« Reply #2 - Posted 2006-03-10 03:53:27 »

String[] sarray = (String[]) vector.toArray(new String[0]);

I also used this until I came across the source code,

1  
2  
3  
4  
5  
6  
7  
8  
9  
10  
11  
    public synchronized <T> T[] toArray(T[] a) {
        if (a.length < elementCount)
            return (T[]) Arrays.copyOf(elementData, elementCount, a.getClass());

   System.arraycopy(elementData, 0, a, 0, elementCount);

        if (a.length > elementCount)
            a[elementCount] = null;

        return a;
    }

(note: this is from Java 6, which introduced 'Arrays.copyOf')

which made me assume that the follwing soulde be faster:

1  
String[] sarray = vector.toArray(new String[vector.size()]);

(further, the cast shouldn't be necessary using java 5+)

Games published by our own members! Check 'em out!
Legends of Yore - The Casual Retro Roguelike
Offline swpalmer

JGO Coder


Exp: 12 years


Where's the Kaboom?


« Reply #3 - Posted 2006-03-10 23:21:29 »

Also, prefer ArrayList to Vector.. Vector has synchronization that is usually useless.

Offline Gannin

Senior Newbie





« Reply #4 - Posted 2006-03-11 23:25:02 »

Thank you very much for all of the replies.  All of them seem to be more resource-friendly than spinning through a for loop.
Pages: [1]
  ignore  |  Print  
 
 
You cannot reply to this message, because it is very, very old.

 

Add your game by posting it in the WIP section,
or publish it in Showcase.

The first screenshot will be displayed as a thumbnail.

xFryIx (58 views)
2014-11-13 12:34:49

digdugdiggy (37 views)
2014-11-12 21:11:50

digdugdiggy (30 views)
2014-11-12 21:10:15

digdugdiggy (24 views)
2014-11-12 21:09:33

kovacsa (48 views)
2014-11-07 19:57:14

TehJavaDev (51 views)
2014-11-03 22:04:50

BurntPizza (51 views)
2014-11-03 18:54:52

moogie (66 views)
2014-11-03 06:22:04

CopyableCougar4 (64 views)
2014-11-01 23:36:41

DarkCart (150 views)
2014-11-01 14:51:03
Understanding relations between setOrigin, setScale and setPosition in libGdx
by mbabuskov
2014-10-09 22:35:00

Definite guide to supporting multiple device resolutions on Android (2014)
by mbabuskov
2014-10-02 22:36:02

List of Learning Resources
by Longor1996
2014-08-16 10:40:00

List of Learning Resources
by SilverTiger
2014-08-05 19:33:27

Resources for WIP games
by CogWheelz
2014-08-01 16:20:17

Resources for WIP games
by CogWheelz
2014-08-01 16:19:50

List of Learning Resources
by SilverTiger
2014-07-31 16:29:50

List of Learning Resources
by SilverTiger
2014-07-31 16:26:06
java-gaming.org is not responsible for the content posted by its members, including references to external websites, and other references that may or may not have a relation with our primarily gaming and game production oriented community. inquiries and complaints can be sent via email to the info‑account of the company managing the website of java‑gaming.org
Powered by MySQL Powered by PHP Powered by SMF 1.1.18 | SMF © 2013, Simple Machines | Managed by Enhanced Four Valid XHTML 1.0! Valid CSS!