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POReading an array consecutively with two threads
 

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    <p>I have an array : int[] arr = {5,4,3,1,2};</p> <pre><code> I want to do like this:: 5 should be read by thread one 4 should be read by thread two 3 should be read by thread one 1 should be read by thread two 2 should be read by thread one </code></pre> <p>I have tried my best this simple program:</p> <pre><code>package com.techighost.create.deadlock; public class ArrayReading implements Runnable { volatile int index = 0; int[] arr; public ArrayReading(int[] arr) { this.arr = arr; } @Override public void run() { synchronized (arr) { for (;index&lt;=(arr.length-1);) { if (index % 2 == 0 &amp;&amp; Thread.currentThread().getName().equals("Thread-One")) { System.out.println(arr[index] + " " + Thread.currentThread().getName()); index++; arr.notify(); } else if (index % 2 != 0 &amp;&amp; Thread.currentThread().getName().equals("Thread-Two")) { System.out.println(arr[index] + " " + Thread.currentThread().getName()); index++; arr.notify(); }else{ System.out.println("In else " + Thread.currentThread().getName()); try { arr.wait(); } catch (InterruptedException e) { e.printStackTrace(); } } } } } public static void main(String[] args) throws InterruptedException { int[] arr = { 5, 4, 3, 1, 2 }; ArrayReading arrayReading = new ArrayReading(arr); Thread t = new Thread(arrayReading); t.setName("Thread-One"); Thread t1 = new Thread(arrayReading); t1.setName("Thread-Two"); t.start(); t1.start(); t.join(); t1.join(); } } </code></pre> <p><strong>I think that this thread name check should not be there? Any body please suggest what can be done to remove this check</strong></p>
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    1. USSunny Gupta
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    1. COWhy do you want this specific thread 1, 2, 1 pattern? The whole nature of threads is supposed to be asynchronous and _not_ this orderly. You should just submit the jobs from the array into an `ExecutorService` and let the threads process them in parallel.
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      1. USGray
    2. CO@Gray I was trying something. and i thought check on thread name is not kool
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      1. USSunny Gupta
    3. COIf you want your tasks to run sequentially, run them sequentially. If you want them to run in parallel, expect random interleaving...
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      1. USassylias
 

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