Problems with adding a string to a list by multiple threads

advertisements

this is a follow-up post to Do I need a concurrent collection for adding elements to a list by many threads?

everybody there has focused on expaning of the list. I understand how that can be a problem, but .. what about adding elements ? is that thread-safe?

example code

static final Collection<String> FILES = new ArrayList<String>(1000000);

and I execute in many threads (I add less than 1000000 elements)

FILES.add(string)

is that thread safe ? what are possible problems with doing it that way ?

ArrayList<String> is not synchronized by itself. Use Collections.synchronizedList(new ArrayList<String>()) instead.

Related Articles

problems with adding an item to the list in VB

This is a homework assignment for Visual Basic (using Visual Studio 2013). This is my first question on this site (or any site). I am trying to make a phone directory that utilizes lists. The directory should be able to search, add and delete contact

Problem with adding sorted strings to a SortedSet in Java

I created a my own SortedSet here is the code for adding something to the array. (I know there are better and simpler ways to do this than an Array but it has to be done this way) public boolean add(AnyType x){ if(this.contains(x)) return false; else

problem with adding a map to a list using each closure

I am trying to add a map to a list using the each closure. The sample is like this def list = [1, 2, 3, 4] def titles = [] def map = [:] list.each{ map.put('index', xxxx) map.put('title', xxxxx) titles.add(map) } If I print the value of the final til

Having problems with adding objects to NSMutableArray

I am having problem with adding objects to NSMutableArray *array. // Controller.m #import "Controller.h" @implementation Controller - (void)parser:(NSString *)string{ [array addObject:string]; NSLog(@"answerArray(1): %@",[array objectA

Problem with '-' and '& amp;' String in mysql

I have a search engine in PHP. When a search normally it's OK. Search text is 'company', and in the database there is 'company' in the field... The problem is when the search text is &company or -company and the data is &company or -company there

Null reference when managing a list in multiple threads

Basically, i have a collection of objects, i am chopping it into small collections, and doing some work on a thread over each small collection simultaneously. int totalCount = SomeDictionary.Values.ToList().Count; int singleThreadCount = (int)Math.Ro

Having problems with spaces and strings in a function

Prompt Turn a string into rollercoaster case. The first letter of the sentence is uppercase, the next lowercase, the next uppercase, and so on. Code with open('test.txt') as file: for line in file: words = line.split() for word in words: chars = list

Problem with adding the Linq variable in ViewState

I have following LINQ statement: string[] str = { "a", "ab", "abcd" }; var s1 = from s in str.AsEnumerable() select s; ViewState.Add("str", s1); I added s1 into ViewState and I got following error: Type 'System.Linq

What is the problem with my code on the linked list in Java?

I have created two classes namely Node and LinkedList. The code is compilable but it never produces the last data that I store in my linked list. Consider these two classes Node.java public class Node { private int id; private String name; private No

Strange has_many: problem with adding objects to a collection

Bounty of $25 for the first working solution. I'm seeing a really weird has_many :through problem with ActiveRecord. With these classes: create_table :numbers do |t| t.string :phone_number end create_table :call_lists do |t| t.string :type t.string :

Problem with structures and strings

I made a linked list whose nodes hold 4 string values. When I call the newNode function, an error says 'Node has no member named familyName', as well as the other members. My code: I am really confused with how strings work in structs.Your immediate