ArrayList will grow and shrink implicitly

Hi,
I have an ArrayList which is going to hold 1000 elements, hence I have defined the List as :-
List list = new ArrayList(1000);
If the number of elements is less than 1000 , in such case whether the ArrayList will shrink implictly and similarly
if the number of elements grows from 1000 to 1500 whether the ArrayList will increase the size implicitly to 1500?
I know that ArrayList will increase the size of its internal array to 50 % when compared to Vector?
If the above wont happen then it will be a problem as unnecessary memory space will be available List?
Please clarify.
Thanks.

797836 wrote:
Thanks.
This clearly indicates that if we are entirely sure that you are going to work with 1000 elements then better to define the initial capacity that way ,It can be better. In many cases--probably most cases--it will make no noticeable difference.
if not, use always use the default value (ie) 10. That can be better. In many cases, it will make no noticeable difference. Also note that resizing costs time and memory. For a brief period, there are two copies of the backing array--the initial one and the new, larger one. And of course copying the references takes CPU cycles. Most of the time this will not be noticeable, but if you're comparing specifying the initial size vs. going with the default, it's worth considering.
Also note that there exists a method to shrink the array. I think it's called trimToSize() or something like that.
In the end, if you think you have a rough idea how big the list will get, you may get some benefit from creating it with an appropriate initial capacity. Most of the time, however, it won't make a noticeable difference either way, so it's not usually worth spending much time thinking about it. When you test for scalability, if you find a bottleneck there, you can adjust the initial capacity as needed.

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HashMap will grow and shrink dynamically

Hi,
By default Hashmap takes 16 as an initial capacity. If it is more than 16 it will grow dynamically based on the constant factor.
If it is less than 16 elements set whether it will shrink dynamically as well? Please clarify.
Thanks.

797836 wrote:
Hi,
By default Hashmap takes 16 as an initial capacity. If it is more than 16 it will grow dynamically based on the constant factor.
If it is less than 16 elements set whether it will shrink dynamically as well? Please clarify.
Thanks.The size() call will give you a reduced number of entries. Entries are stored internally in an array, that will grow, but never shrink. I.e. if you add 25 entries to a new HashMap it will have a capacity of 32 and a size of 25. After removing 10 of those entries capacity will still be 32, but size will be 15.

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Grow and Shrink the gallery's "mainImage"
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Message was edited by: W_Bell

import javax.swing.*;
import java.awt.*;
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frame.addComponentListener(new ComponentAdapter(){//<---------------------
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01     | A     | 1
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Post Author: Ranjit
CA Forum: Crystal Reports
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There's an apple store in my city but it is about a 20 minute drive and I do not have apple care. Do you think they would still help me?

How can I import a movie into iMovie 09 from a hard drive? The movie will open and play in idvd but breaks into separate files that can't be downloaded when I try to import. Can it be done?

How can I import a movie into iMovie 09 from a hard drive? The movie will open and play in idvd but breaks into separate files that can't be downloaded when I try to import. Can it be done? I am trying to create a disc of player highlights for a collegiate coach, and I am using movie files downloaded to my hard drive from a DVD created on a PC.

No unfortunately it won't open in quicktime either. It does the same thing that Imovie does, separates it into two file folders audio and video, and if i select video it opens to reveal 8 files that cannot be selected. VIDEO_TS.BUP, VIDEO_TS.IFO, VIDEO_TS.VOB,VTS_01_0.BUP, VTS_01_0.IFO, VTS_01_1.VOB, VTS_01_2.VB, VTS_01_3.VOB. All of which cannot be opened or selected.
Opening it in Idvd and folllowing your suggestion works and I get a format code of NTSC. Is that the same? Thank you for your time and response.
CaCanuck

I keep getting an error window about java since I updated to firefox 8, my tabs will flash, tabs will close and open in a new window, everything stops working, firefox is non responsive, please help

Since I upgraded to firefox 8, I get this error window that pops up says something about java. My tabs flicker or flash, the tabs will close and open in a new window then everything stops. Then firefox does not respond. When I get this error message, I have to close all tabs wait a few seconds then open it back up it will work for a little while and then do the same thing. I have disabled plug-ins that I do not use, I have cleared my cache and cookies, I am not happy at all with this new version. I waited a while before updating. The first time I was going to update, firefox would not let me keep my anti-virus plug-in. PLEASE HELP

Hello,
The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information.
Note: ''This will cause you to lose any Extensions, Open websites, and some Preferences.''
To Reset Firefox do the following:
#Go to Firefox > Help > Troubleshooting Information.
#Click the "Reset Firefox" button.
#Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
#Firefox will open with all factory defaults applied.
Further information can be found in the [[Reset Firefox – easily fix most problems]] article.
Did this fix your problems? Please report back to us!
Thank you.

ArrayList will grow and shrink implicitly

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