I wanted to know if it was possible to change
ArrayList<ArrayList<String>>
to String[][] in java. I do not think that the toArray() function would recurse inside its generic parameter. Any advice would be greatly appreciated.
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2 Answers
You're right that toArray won't recurse. I'm afraid you'll have to do this manually. Something like:
List<List<String>> stringLists;
String[][] stringArrays = new String[stringLists.size()][];
int i = 0;
foreach (List<String> stringList: stringLists) {
stringArrays[i] = stringList.toArray(new String[stringList.size()]);
++i;
}
I haven't actually tried that, mind, so it could be rubbish.
4 Comments
Snicolas
you get it, 3 secs before me :)
Tom Anderson
I got lucky - my typing is usually so bad it takes me another minute to get my posts fixed before i can post them, but today it came out quite quickly!
Snicolas
I was gonna ask how you typed and formatted it so fast ;) Do you usually use eclipse to answer ? I type directly in the textfield and correct indentation manually.
Tom Anderson
No, i just type in the text area. I am a pretty fast typist, but i'm generally quite inaccurate, so although i can type something fast, i then need to spend as much time fixing it as i spent typing it. This time, i didn't make as many mistakes as usual.
if bigL is your bigger array list, and tab has been created to bigL.size().
Can't you do something like :
for( ArrayList<String> l : bigL )
{
tab[ index ++ ] = l.toArray( new String[ l.size() ] );
}//for
