So basically I'm not sure if this is the correct way to synchronize my ArrayList.
I have an ArrayList "in_queue" which is passed in from the registerInQueue function.
ArrayList<Record> in_queue ...
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I read ArrayList is synchronized in java...
When do we use synchronized ArrayList as we have already Vectors synchronized....
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I've been mulling this over & reading but can find an absolute authoritative answer.
I have several deep data structures made up of objects containing ArrayLists, Strings & primitive values. I can ... |
I have an ArrayList that I want to use to hold RaceCar objects that extend the Thread class as soon as they are finished executing. A class, called Race, handles this ... |
I am writing an application similar to a chat server-client pair.
I am planning on having a central Object which will hold new messages received from clients until they are dealt with ... |
I am serializing an ArrayList in 2 classes:
private void serializeQuotes(){
FileOutputStream fos;
try {
...
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i have created synchronized arrayList like this
import java.text.SimpleDateFormat;
import java.util.*;
class HelloThread
{
int i=1;
List arrayList;
public void go()
{
arrayList=Collections.synchronizedList(new ArrayList());
Thread thread1=new Thread(new Runnable() {
...
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I'm having a bit of difficulty understanding how to synchronize ArrayList's between threads in java. Currently my code looks like:
Public class Runner {
public static void ...
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I wonder why this question still exists in 2011,J2SE 1.2 was released in Dec 98 with Collections framework.is there anybody out there still using Vector(unless you are writing client for ... |
once again a question about ArrayList and synchronize.
I'd just like to know what this snippet exactly does:
ArrayList<ObjectX> list = ....;
synchronized (list) {
if (list.contains(objectxy) == false) {
...
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What does it mean when we say an ArrayList is not synchronized?
Does it mean that if we declare an ArrayList in object scope, multiple threads accessing the objects have the ... |
I have an ArrayList that needs to be read from and written to from multiple components of my GUI. I have drastically reduced the amount of code to try to ... |
Hi, I have a value object, SubordinateUserDTO (DTO == Data Transfer Object), that contains a collection (ArrayList) of another value object, OrgRoleDTO. In addition to the usual getter/setters, I would like to add methods to add and remove OrgRoleDTO items from the collection. So the SubordinateUserDTO looks like this: import java.util.ArrayList; public class SubordinateUserDTO { private String userId; //... private ArrayList ... |
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Both ArrayList and Vector implement the List interface, but Vector has a bunch of other methods that duplicate the functionality of those List methods, but have uglier names: for example, addElement(). Vector also provides a methat that returns an old-fashioned Enumeration are well as an Iterator. The one additional difference is that the algorithms used to grow the underlying array when ... |
I think Synchronization (i.e. Thread safety) is the main difference. Because of which one more thing comes into picture that is "speed(or performance)" of the operations on these collection objects. When you know that there will not be multiple threads accesing the collection object you should use the ArrayList instead of vector. -Rupali SCJP , SCWCD. |
In your solution, only part of the method call is synchronized. The list remains the same, without any synchronization of its own. Collections.synchronizedList handles that internally. It returns a new List wrapper that is implemented simlarly like this: class SynchronizedList implements List { private List list; private Object mutex; public SynchronizedList(List list) { this.list = list; mutex = this; } public ... |
Hi Java Gurus, I have a question eating my mind about ArryList and Vector.There are two questions here : 1) How to get a synchronized ArrayList ? I know that i can get it by using the synchronizedList(List list) method in collection but then it also says that "It is imperative that the user manually synchronize on the returned list from ... |
Hello friends, The methods in vector are synchronized, but in the ArrayList is not. But When I see the API, NO methods in the Vector class was declared with Synchronized keyword? I know the use of Synchronized keyword in case of Multithreading concept. But I can't get the concept in case of Vector and ArrayList, that is, how the methods in ... |
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hi Java Community pple, how do i synchronized an arraylist in core java??? If u have an example can you please paste it here. Assuming list l1 = new ArrayList(); how do i synchronize the above array list without using a synchronize block... can any one help me out with an example. Code attached will be highly helpful and appreciated. |
Read the sun tutorials about threads. Synchronizing is quite easy. But a good implementation really depends on the context, so there is no perfect solution. Multithreaded architecture can be really nasty. Rely on what the JDK provides as far as you can, and only implement own synchronization techniques when you really have to. |