When to choose ArrayList and LinkedList ?

Please let me know which list type to use and when ? Pros Cons .. Advantages Disadvantages
ArrayList vs LinkedList ?

Here is a good place to start [http://www.google.co.uk/search?q=arraylist+vs+linkedlist] 154,000 hits. I think most of the arguments are covered here. ;]

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Both of the advantages of ArrayList and LinkedList are needed.

Hi there,
I wonder how if I want performance on random access an ArrayList and also remove elements in any position of the List? As far as I know that a LinkedList is the best choice if I want to remove elements in any position of the List, but it's slow on traversing the List. Sometimes it's hard to choose between ArrayList and LinkedList, is there a way that I could have both advantages of ArrayList and LinkedList?
Any suggestion?
Thanks,
Jax

I think you might be interested in the data structure
called a deque. It is built for fast insertions
at both ends and is usually implemented as a linked
list of arrays. The standard collections API does not
offer this data structure (I wish it did). So you have
to find a 3rd party implementation. Try searching
Google: http://www.google.com/search?q=java+deque
Thanks nasch and pervel for the information. What do you think if I do something like this?
List a = new ArrayList();
// perform some tasks that is fast with ArrayList
List b = new LinkedList(a);
// perform some tasks..
Although a new object is created, but that perform better than one ArrayList or one LinkedList solely.

Mt icloud mail account was working fine. Now when I access mail, a screen pops up with a choice of mail sites. When I choose icloud and enter my id and password and press next it says this acct is already set up. There is no other option.... Please help m

My icloud mail was working fine. Now, when I access my mail ,a screen appears to prompt me to choose mail websites. When I choose icloud, enter my id and password, press next it tells me this account already exists. Help ? How can I access my mail again?

Hello Irishjanet,
I would recommend the following steps from our Mail troubleshooting guide:
Restart your iOS device.
Delete the affected email account from your device.
Tap Settings > Mail, Contacts, Calendars.
Choose the affected email account, then tap Delete Account.
Add your account again.
iOS: Troubleshooting Mail
http://support.apple.com/kb/TS3899
Cheers,
Allen

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Differece between ArrayList and LinkedList

Differece between ArrayList and LinkedList

An array list is implemented as an array. A LinkedList is implemented as a series of separate nodes linked by references.
Although they both support the same methods, that has performance implications. Linked lists are better at inserting and deleting arbitary elements, but are slow to reference an element by index.

Design choice between ArrayList and LinkedList

Can someone clarify me which is better suited (efficient) for use?
It appears to me that both can be used very much interchangeably at least from functionality point of view. :(

Using the following code (and I'm sure someone will come nitpicking about it) I get the (expected, at least by me from prior experience) result that iteration over a LinkedList is about twice as fast as iteration over an ArrayList, but lookup operations on an ArrayList are substantially faster:
package jtw.test;
import java.util.*;
public class SpeedTest {
    public static void main(String... args) throws Exception {
        List<Integer> linked = new LinkedList<Integer>();
        List<Integer> arr = new ArrayList<Integer>();
        for (int i = 0; i < 1e3; i++) {
            linked.add(i);
            arr.add(i);
        long r = 0;
        Date startLinked = new Date();
        for (int i = 0; i < 1e3; i++) {
            for (Integer q: linked) {
                 r += q;
        Date stopLinked = new Date();
        System.out.println("Total: " + r);
        r = 0;
        Date startArr = new Date();
        for (int i = 0; i < 1e3; i++) {
            for (Integer q: arr) {
                 r += q;
        Date stopArr = new Date();
        System.out.println("Total: " + r);
        System.out.println("LinkedList iteration: " + startLinked + " to " + stopLinked + " took " + (stopLinked.getTime() - startLinked.getTime()));
        System.out.println(" ArrayList iteration: " + startArr + " to " + stopArr + " took " + (stopArr.getTime() - startArr.getTime()));
         r = 0;
        startLinked = new Date();
        for (int i = 0; i < 1e3; i++) {
            for (int j = 999; j >= 0; j--) {
                 r += linked.get(j);
        stopLinked = new Date();
        System.out.println("Total: " + r);
        r = 0;
        startArr = new Date();
        for (int i = 0; i < 1e3; i++) {
            for (int j = 999; j >= 0; j--) {
                 r += arr.get(j);
        stopArr = new Date();
        System.out.println("Total: " + r);
        System.out.println("LinkedList lookup: " + startLinked + " to " + stopLinked + " took " + (stopLinked.getTime() - startLinked.getTime()));
        System.out.println(" ArrayList lookup: " + startArr + " to " + stopArr + " took " + (stopArr.getTime() - startArr.getTime()));
}Gets the result:
D:\jdk1.6.0_05\bin\java -Didea.launcher.port=7540 "-Didea.launcher.bin.path=C:\Program Files\JetBrains\IntelliJ IDEA 8.0.1\bin" -Dfile.encoding=windows-1252 -classpath "D:\jdk1.6.0_05\jre\lib\charsets.jar;D:\jdk1.6.0_05\jre\lib\deploy.jar;D:\jdk1.6.0_05\jre\lib\javaws.jar;D:\jdk1.6.0_05\jre\lib\jce.jar;D:\jdk1.6.0_05\jre\lib\jsse.jar;D:\jdk1.6.0_05\jre\lib\management-agent.jar;D:\jdk1.6.0_05\jre\lib\plugin.jar;D:\jdk1.6.0_05\jre\lib\resources.jar;D:\jdk1.6.0_05\jre\lib\rt.jar;D:\jdk1.6.0_05\jre\lib\ext\dnsns.jar;D:\jdk1.6.0_05\jre\lib\ext\localedata.jar;D:\jdk1.6.0_05\jre\lib\ext\sunjce_provider.jar;D:\jdk1.6.0_05\jre\lib\ext\sunmscapi.jar;D:\jdk1.6.0_05\jre\lib\ext\sunpkcs11.jar;F:\dev\Euler\out\production\Euler;C:\Program Files\JetBrains\IntelliJ IDEA 8.0.1\lib\idea_rt.jar" com.intellij.rt.execution.application.AppMain jtw.test.SpeedTest
Total: 499500000
Total: 499500000
LinkedList iteration: Wed Jan 21 07:32:41 CET 2009 to Wed Jan 21 07:32:41 CET 2009 took 30
ArrayList iteration: Wed Jan 21 07:32:41 CET 2009 to Wed Jan 21 07:32:41 CET 2009 took 53
Total: 499500000
Total: 499500000
LinkedList lookup: Wed Jan 21 07:32:41 CET 2009 to Wed Jan 21 07:32:42 CET 2009 took 424
ArrayList lookup: Wed Jan 21 07:32:42 CET 2009 to Wed Jan 21 07:32:42 CET 2009 took 22
Process finished with exit code 0Given the internal representation of the datatypes, this is to be expected.

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When to choose JSP and When to choose Servlet in Web Application

Hi,
I know that using JSP over servlet has only one advantage like for huge Application you can devide presentation layer from business logic. Is there any other advantage.
Also, if anyone can tell me how to handle FTP request in Servlet as HttpServlet supports only HTTP.
Thanks.
Subs

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http://jakarta.apache.org/struts/index.html
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Which is better? ArrayList or LinkedList

Do you know which one is better between ArrayList and LinkdedList in terms of performance, speed and capacity?
Which one do you suggest to use ?
Thanks

It depends upon how the list is going to be used. ArrayLists and LinkedLists work differently -- you need to think about how they each store their data.
ArrayLists store their list items in, well, arrays. This makes them very fast at addressing those items by index #. So any implementation that needs a lot of random access to the list, such as sorting, is going to be relatively fast.
The downside of storing the list in an array presents itself when it comes time to add more items to the list. When it runs out of space in the array, it must create a new larger array and copy the items over to it. Also, if you need to insert or remove an item anywhere other than the end of the list, ArrayList must shift the subsequent items in the list by doing an array copy.
This can be a real drag if you're implementing a queue. This is where LinkedList shines. Each item in the list points to the next and previous ones in the list. Inserting, appending or removing list items involves a couple simple assignment statements. No reallocations or large memory copies are involved. Access is easy as long as it is sequential.
Random access in a linked list is problematic however. In order to get to the Nth item in the list, LinkedList must start with the first item in the list and step through the list N-1 times. An order of magnitude slower than using an ArrayList.

Occasional grey screen when switching between SL and Windows

Hi folks,
I set up my new Mac Mini to dual-boot with Windows XP using boot camp. Sometimes when I switch from one to the other the system hangs on a grey screen and I have to shut down using the power button. This happens both when I choose restart and hold down the options (alt) tab and when I use system preferences and choose the boot drive from the menu. This is my config:
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We'll see if the problems occurs again.

When to choose oracle

Hi
I don’t know whether I can start this thread in this forum, but nevertheless I think I can get a better clarity from the experts, when I was googling to know the advantages of oracle over teradata and vice versa, I happened to see some articles, but most of them were written by peoples Who are biased with their own technology, I couldn’t get a fair idea , so it would be helpful for me if anyone could share their experience who had seen both the positives and negatives of both these database .
My questions are.
1.when to choose oracle and when to choose teradata
2.What are the major architectural differences between oracle and teradata, that makes one better than the other

You might find this article interesting,
Teradata and Oracle Partner for Enterprise Analytics
http://www.dashboardinsight.com/news/teradata-and-oracle-partner-for-enterprise-analytics.aspx
Well since you have read both sides of the story you can make your own judgement based on the articles. I suppose these articles from both sides will lists the pros/cons compare to their competitor and vice versa. You can gather these pros/cons and compose your own list and make smart decision.
Not knowing much about the technology of Teradata, my comments here is again biased. As the name suggested, TeraData has some strength on DataWare house territory, on most other parts I believe Oracle has an edge. Don't forget Oracle has survived fiercy competition from Sybase and Informix and dominate the market for over a decade.

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The Java type returned from the call was defined as ArrayList. Changing it to List resolved the problem.
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http://home.sums.ac.ir/~rowshansh/firefox.png
http://www.sums.ac.ir/~rowshansh/firefox.png

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*http://kb.mozillazine.org/Browser_attempts_to_connect_when_already_connected

When to choose ArrayList and LinkedList ?

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