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POHow to make two threads wait and notify each other
 

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  1. POHow to make two threads wait and notify each other
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    <p>I have to create two Threads which have to poll and object from a queue in 2 seconds intervals. </p> <p>The first Thread poll and object then wait and notify the second one to poll the object from it's queue.</p> <p>I read all about wait and notify but nothing works with me.</p> <p>Any sugestions?</p> <p>First thread:</p> <pre><code>public class SouthThread extends Thread { private Queue&lt;Car&gt; q = new LinkedList&lt;Car&gt;(); public void CreateQueue() { Scanner input = new Scanner(System.in); for (int i = 0; i &lt; 2; i++) { Car c = new Car(); System.out.println("Enter registration number: "); String regNum = input.nextLine(); c.setRegNum(regNum); q.offer(c); } } public int getQueueSize() { return q.size(); } @Override public void run() { while (q.size() != 0) try { while (q.size() != 0) { synchronized (this) { System.out.print("The car with registration number: "); System.out.print(q.poll().getRegNum()); System.out .println(" have passed the bridge from the south side."); this.wait(2000); notify(); } } } catch (InterruptedException e) { e.printStackTrace(); } } </code></pre> <p>}</p> <p>Second thread:</p> <pre><code>public class NorthThread extends Thread { private Queue&lt;Car&gt; q = new LinkedList&lt;Car&gt;(); public void CreateQueue() { Scanner input = new Scanner(System.in); for (int i = 0; i &lt; 2; i++) { Car c = new Car(); System.out.println("Enter registration number: "); String regNum = input.nextLine(); c.setRegNum(regNum); q.offer(c); } } public int getQueueSize() { return q.size(); } @Override public void run() { try { while (q.size() != 0) { synchronized (this) { System.out.print("The car with registration number: "); System.out.print(q.poll().getRegNum()); System.out .println(" have passed the bridge from the north side."); this.wait(2000); notify(); } } } catch (InterruptedException e) { e.printStackTrace(); } } </code></pre> <p>}</p> <p>Main Thread:</p> <pre><code>public class Main { public static void main(String[] args) throws Exception { // TODO Auto-generated method stub SouthThread tSouthThread = new SouthThread(); NorthThread tNorthThread = new NorthThread(); tSouthThread.CreateQueue(); tNorthThread.CreateQueue(); System.out.println(tSouthThread.getQueueSize()); tSouthThread.start(); tNorthThread.start(); } </code></pre> <p>}</p>
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    1. USAltair
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    1. COEach thread has its own queue?
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    2. COCan you explain more _why_ you want this lock stepped behavior?
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    3. COYes. I have two queues with cars, which pass through a bridge. And in two seconds a car have to pass through it.
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      1. USAltair
 

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