Java Synchronized list

by

Yes, Just be careful if you are also iterating over the list, because in this case you will need to synchronize on it. From the Javadoc:

It is imperative that the user manually synchronize on the returned list when iterating over it:

List list = Collections.synchronizedList(new ArrayList());
    ...
synchronized (list) {
    Iterator i = list.iterator(); // Must be in synchronized block
    while (i.hasNext())
        foo(i.next());
}

Or, you can use CopyOnWriteArrayList which is slower for writes but doesn’t have this issue.

More Related Contents:

  1. I have wondered why ‘new Thread(new Thread(),”string”);’ is running correctly
  2. Difference between volatile and synchronized in Java
  3. In ArrayBlockingQueue, why copy final member field into local final variable?
  4. What does java.lang.Thread.interrupt() do?
  5. Java multi-threading & Safe Publication [closed]
  6. Are Java static initializers thread safe?
  7. Multithreaded quicksort or mergesort
  8. java.lang.IllegalStateException: Not on FX application thread; currentThread = Thread-4
  9. In which thread do CompletableFuture’s completion handlers execute?
  10. If I synchronized two methods on the same class, can they run simultaneously?
  11. Cancelling a long running regex match?
  12. Turning an ExecutorService to daemon in Java
  13. What is the difference between a synchronized method and synchronized block in Java? [duplicate]
  14. java.io.StreamCorruptedException: invalid type code: 00
  15. How much memory does my java thread take?
  16. Sending a message to all clients (Client – Server communication)
  17. Wait until child threads completed : Java
  18. Why does java.util.concurrent.ArrayBlockingQueue use ‘while’ loops instead of ‘if’ around calls to await()?
  19. FixedThreadPool vs CachedThreadPool: the lesser of two evils
  20. JTextArea appending problems
  21. How to use spring transaction in multithread
  22. What is the most frequent concurrency issue you’ve encountered in Java? [closed]
  23. Thread safe Hash Map?
  24. How to listen for Firebase setValue completion
  25. Static variables and multithreading in java
  26. Dynamic Thread Pool
  27. JAVAFX : why wait cursor needs a new thread?
  28. Stopping a specific java thread
  29. notifyAll() throws IllegalMonitorStateException
  30. If a synchronized method calls another non-synchronized method, is there a lock on the non-synchronized method

Leave a Comment