I've always been one to simply use List<String> names = new ArrayList<String>();
I use the interface as the type name for portability, so that when I ask questions such as these I ... |
In theory, is it easier to remove elements from an ArrayList or a LinkedList ?
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Taken from Apache TreeList doc:
The following relative performance statistics are indicative of this class:
get add ...
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I have read that LinkedHashMap has faster iteration speed than HashMap because its elements are doubly linked to each other. Additionally, because of this, LinkedHashMap is slower when inserting or deleting ... |
I have the following code:
public static void printCollection(ArrayList<Data> al, LinkedList<Data> ll, Stack<Data> stack){
for(Iterator<Data> iter = al.iterator(); iter.hasNext();){
Data x = ...
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i thought linkedlists were supposed to be faster than an arraylist when adding elements? i just did a test of how long it takes to add, sort, and search for elements ... |
I asked in another question why arraylist seemed faster than linkedlist when reading a file and to create the lists. I've now tried adding to the front of the list or ... |
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I am converting java code to vb.net and this line of code gives me different output in enclipse than one in VS.
req1.set(req3, Integer.valueOf(((Integer)req1.get(req3)).intValue() ^ ((Integer)req6.get(req3 + 256)).intValue() & 0x1));
System.out.println(req1.get(req3));
where req1 is ... |
I want to be able to access a certain node in my Doubly Linked List in O(1) time. I know that if i traverse the list to find a certain node ... |
About the List, Linkedlist and Arraylist, which one is a one way list and which one is Doubly-linked list?
And how could we reverse it?
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I was following a previous post on this that says:
For LinkedList
* get is O(n)
* add is O(1)
* remove ...
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I created a storage class and use to as the data type for my arraylist/Linked list.
private LinkedList bid_history;
I have initialised this in my constructure as
bid_history=new LinkedList <Bid_History> ();
I add new items ... |
Possible Duplicate:
When to use LinkedList<> over ArrayList<>?
I saw the API for the ArrayList and LinkedList and it seems to be same. Apart from their ... |
What is the reason why we cannot always use a HashMap, even though it is much more efficient than ArrayList or LinkedList in add,remove operations, also irrespective of the number of ... |
I want to use data structure that need sorted betweenwhiles. Size of the data structure will hardly be exceed 1000 items. Which one is better ArrayList or LinkedList ? Which sorting ... |
Both are similar, though slightly different in terms of goal and implementation. In a LinkedList, each element is linked to its previous and next element making it easier to delete or insert in the middle of the list. A ArrayList is more as its name subjects used as an array. Performance is similar, though LinkedList is optimized when inserting elements before ... |
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ArrayList is always at least twice as fast than LinkedList. ArrayList provides a collection backed by an array. It provides quick indexed access to its elements, and works best when elements are only added and removed at the end. By comparison, LinkedList is best when add and remove operations happen anywhere, not only at the end. But LinkedList's added flexibility comes ... |
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ArrayList will generally use less memory per item -- often quite a bit less. It also gives you faster access to a given item by index (constant time as opposed to time linearaly proportional to size.) LinkedList, however, has a big advantage in one area: adding and deleting items in the middle of the list is much faster than the equivalent ... |
ArrayList is implemented with an array to store the elements of the list. LinkedList is implemented as a doubly-linked list. Which one you should use depends on how you use the list. An ArrayList is faster when you need to lookup an element at a known index in the list, but slower when you insert elements in the list. A LinkedList ... |
Hi - I'm trying to write an application that will deconstruct relational tables for analysis. I'm attempting to deconstruct the tables and store them as objects within a List collection, but whenever I try to add objects to the lists I get an exception. The faulty code is listed below: while(rset.next()) { // check for last row of result set if(rset.isLast() ... |
I believe what is meant is that accessing a single element in an array requires constant time regardless of which element you are accessing, whereas accessing a single element in a linked list requires linear time. In other words, if you want to access the 100th item in the array, the computer would go directly to the 100th item and get ... |
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I read in Bruce Eckel's Thinking in Java that an ArrayList allows rapid access to elements, but is slow when inserting and removing elements from the middle of the list. Also that a LinkedList has inexpensive insertions and deletions from the middle of the list but is relatively slow for random access. I thought I would test this out so I ... |
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The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - ... |
To answer in short, when you want to deal with heterogeneous elements in one container, that's why Collections are there and the aforementioned elements are all a part of Collections in Java. The term heterogeneous means elements of different/dissimilar kind which is contradicting to arrays as arrays can only store the elements of same kind. You may go through the link ... |
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Hi seetharaman, when you use ArrayList and LinkedList only as "List" interface there's indeed no big difference between them - regarding the API. But there's a big difference how they are implemented! Usually you shouldn't have to worry about the implementations of an interface but the different collection classes make a big difference regarding performance of one or another method. Some ... |
The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - ... |
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I will try to supply an answer for the LinkedList / ArrayList issue. The first thing to do is to look at what interfaces these two implement. This might hint us at their purpose, as Sun usually bound purposes into interfaces. // lang java public class ArrayList extends AbstractList implements List, RandomAccess, Cloneable, Serializable public class LinkedList extends AbstractSequentialList implements List, ... |
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which is faster? You will quickly learn that the answer to almost EVERY question related to programming and "which is better/faster" is always "It depends". In a nutshell, it is going to be faster to FIND a specific element (I.e the 27th) in an array. Searching for the element where you don't know the location will be roughly the ... |
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Hi, welcome to the forums. You might find you get the best help if you give your own ideas of what the time complexities might be. And say what resources you have consulted so far (the javadocs, wikipedia, etc) I say this because otherwise it might look like a homework dump. Also, what does add(N/2,x) mean? And what is the difference ... |
Linked list elements are doubly linked to each other ,so for insertions and deletions it will be slow. Since ArrayLists and Vector have no concepts of double linkage,those two are certainly faster and since vector methods are synchronized they would be a bit slower than ArrayList. So Arraylist is left and hence the answer. ^^^^^^^^ This is how I would have ... |
hello, i have a linkedlist of objects of size 1000. Every object(every node of linked list is an instance of a class) in linkedlist contains of 20 variables. Now i want to take objects from this linkedlist and put it into array list.??? Example: If User says me i want to see linked list between range 30 to 200. So i ... |
You should really learn about how those two are implemented and learn what that means. Otherwise each answer will just seem like arcane knowledge to you. Basically: * Appending is cheap on both (it can be moderately expensive with an ArrayList, but on average it's cheap). * Inserting at the beginning (or anywhere, but the end) is cheap with an LinkedList, ... |
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Depends on what you intend to do with them. heres what i know ArrayList Growable array that gives you fast iteration and fast random access. The collection is ordered but not sorted. Recommend using this over a Linked list when you need fast iteration but not doing a lot of Inserts and Deletes. LinkedList Ordered list that provided fast inserts and ... |
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I read another thread somewhere recently that said an ArrayList is almost always faster than a LinkedList (even if you're only adding elements to the end of the list and not accessing it randomly). And that the only time you want to use a linkedlist instead is when you'll be inserting a lot of values into the middle |