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Index › Programming Questions & Help › Syntax Questions › JAVA Array Object

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JAVA Array Object (Read 1274 times)

mistergreen

JAVA Array Object
Mar 26^th, 2007, 7:07pm

JAVA has an Array object that's more flexible then the usual static array (int[] myArray = new int[ 3]) but for the life of me I can't remember it...

It's more flexible then the regular array. I used it last year in processing and it worked... I tried to find it but can't.

if you know, please point me the way. thanks

m
ps. it's pretty sweet.. Processing should document it.

JohnG Ex Member	Re: JAVA Array Object Reply #1 - Mar 26^th, 2007, 8:39pm ArrayList?

mistergreen YaBB Newbies Offline Posts: 18	Re: JAVA Array Object Reply #2 - Mar 26^th, 2007, 8:41pm YES! thanks

mistergreen

Re: JAVA Array Object ( ArrayList )
Reply #3 - Mar 26^th, 2007, 9:02pm

here's an example of it working
Code:


ArrayList myList = new ArrayList();

void setup()
{
  size(200, 200);
  myList.add("A");
  myList.add("B");
  print(myList.get(0) +":"+ myList.size() );
}

here's documentation on it
http://java.sun.com/j2se/1.4.2/docs/api/java/util/ArrayList.html

You don't have to specify the number of index, datatypes, and there's cool methods regular arrays don't offer like finding the length of the array.

fry

Re: JAVA Array Object
Reply #4 - Mar 27^th, 2007, 4:16am

mistergreen wrote on Mar 26^th, 2007, 7:07pm:

ps. it's pretty sweet.. Processing should document it.

it's also slower than just using arrays, and requires that all data (even ints and floats) be wrapped as objects, which is significantly slower. it also makes you get into typing issues. we don't have much to add to the reference over the way it's described in sun's javadoc, so it's not something that we cover.

mistergreen

Re: JAVA Array Object
Reply #5 - Mar 27^th, 2007, 5:29am

speaking of typing issues..
have you tried to append an object into an array?

like..
Code:


myClass [] myArray = new myClass[ 0];
myArray = append(myArray, new myClass() );

this will give me a typing error... Processing doesn't agree myArray & new myClass() as the same typing? I tried casting it too and it doesn't work either.
like:
Code:


myClass [] myArray = new myClass[ 0];
myClass temp = new myClass();
myArray = append(myArray, (myClass) temp );

ArrayList will let me do it.. that's partly why I'm using it instead.

fjen God Member Offline Posts: 965	Re: JAVA Array Object Reply #6 - Mar 27^th, 2007, 9:58am Code: class myClass { } myClass[] arr = new myClass[12]; arr = (myClass[])append( arr, new myClass() ); println( arr.length ); F

mistergreen YaBB Newbies Offline Posts: 18	Re: JAVA Array Object Reply #7 - Mar 27^th, 2007, 3:24pm oh. interesting. thanks.

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