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From: Lew <lewbloch@gmail.com>
Newsgroups: comp.lang.java.programmer
Subject: Re: Size of an arraylist in bytes
Date: Sun, 20 Nov 2011 20:28:16 -0800 (PST)
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On Sunday, November 20, 2011 1:11:00 PM UTC-8, sara wrote:
> Here is the code:
>=20
> 		ArrayList<Integer> tmp=3Dnew ArrayList<Integer>();

*DO NOT USE TAB CHARACTERS TO INDENT USENET CODE LISTINGS!*

> 		tmp.add(-1);
> 		tmp.add(-1);
> 		System.out.println(DiGraph.GetBytes(tmp).length);
> 		tmp.set(0, 10);
> 		System.out.println(DiGraph.GetBytes(tmp).length);
>=20
>=20
> 	public static byte[] GetBytes(Object v) {
> 		ByteArrayOutputStream bos =3D new ByteArrayOutputStream();
> 		ObjectOutputStream oos;
> 		try {
> 			oos =3D new ObjectOutputStream(bos);
> 			oos.writeObject(v);
> 			oos.flush();
> 			oos.close();
> 			bos.close();
> 		} catch (IOException e) {
> 			e.printStackTrace();
> 		}
> 		byte[] data =3D bos.toByteArray();
> 		return data;
> 	}
>=20
> The problem is I need to write multiple arraylists on disk and later

The problem is that the code you posted won't compile.

> on I update the elements of them. I store the starting location of
> arraylists and their size such that later I can refer to them. If the
> size of objects change then it messes up! Could you please help?

Java changes the sizes of things in surprising ways, and makes no promises =
about the size of an 'ArrayList' in the way you're asking.

What do you really want to do?

> On Nov 20, 1:05=A0pm, markspace <-@.> wrote:

*DO NOT TOP-POST!*

--=20
Lew