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POJava Multithread stopping all other threads immediately
 

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  1. POJava Multithread stopping all other threads immediately
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    <p>I have this code:</p> <pre><code>public class BruteForceThread implements Callable&lt;String&gt; { private static volatile boolean stopped = false; public String call() { String password = this.getNextPassword(); while (!stopped) { System.out.println(numberOfThreat + ": " + password); synchronized(this) { try { if (this.testPassword(password)) { stopped = true; return password; } } catch (IOException e) { e.printStackTrace(); } } password = this.getNextPassword(); } return ""; } } </code></pre> <p>Main class:</p> <pre><code>public static void main(String[] args) throws IOException { int numberOfThreads = 2; ExecutorService executor = Executors.newFixedThreadPool(numberOfThreads); CompletionService&lt;String&gt; pool = new ExecutorCompletionService&lt;String&gt;(executor); for (int i = 1; i &lt; numberOfThreads + 1; i++) { Callable&lt;String&gt; bruteForce = new BruteForceThread(...); pool.submit(bruteForce); } executor.shutdown(); for(int i = 0; i &lt; numberOfThreads; i++){ try { String result = pool.take().get(); if (result != "") { System.out.println("Your password: " + result); } } catch (InterruptedException e) { e.printStackTrace(); } catch (ExecutionException e) { e.printStackTrace(); } } executor = null; } </code></pre> <p>Output: ...</p> <pre><code>1: aa &lt;- here first thread found a password 2: Fa &lt;- second thread is continue 2: Fb 2: Fc ... many more ... 2: IZ Your password: aa </code></pre> <p>If one thread find a password and sets stopped to true, another threads does not stop immediately. Why?</p>
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    1. USAlya'a Gamal
    1. USuser2351471
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    1. COHow many cores do you have?
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      1. POJava Multithread stopping all other threads immediately
      1. USdidierc
    2. COYou could try and use an AtomicBoolean instead
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      1. POJava Multithread stopping all other threads immediately
      1. USMadProgrammer
    3. COI used an `ArrayBlockingQueue` as the source of the strings, and I could not reproduce the issue. Though my system has only one core
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      1. POJava Multithread stopping all other threads immediately
      1. USdidierc
 

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