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  1. import java.io.BufferedReader;
  2. import java.io.IOException;
  3. import java.io.InputStreamReader;
  4. import java.util.concurrent.*;
  5.  
  6. public class App{
  7.     public final static BlockingQueue<String> queue = new ArrayBlockingQueue<String>(20);
  8.     public static void main(String[] args) throws ExecutionException, InterruptedException {
  9.         ExecutorService service = null;
  10.         String threadName = Thread.currentThread().getName();
  11.         try {
  12.             service = Executors.newFixedThreadPool(6); // +1 thread for producer
  13.             for(int i=0; i<20; ++i){queue.put("Hello");}
  14.             service.submit(new Producer(service, queue)).get(); // Wait until producer exits
  15.         } finally {
  16.             if (null != service) {
  17.                 service.shutdown();
  18.                 System.out.printf("[%s] Awaiting termination...%n", threadName);
  19.                 try {
  20.                     service.awaitTermination(1, TimeUnit.HOURS);
  21.                 } catch (InterruptedException e) {
  22.                     System.err.println("Failed to terminate worker");
  23.                 }
  24.             }
  25.         }
  26.         System.out.printf("[%s] Done%n", threadName);
  27.     }
  28. }
  29.  
  30. class Worker implements Runnable {
  31.     private String message;
  32.  
  33.     public Worker(String message) {
  34.         this.message = message;
  35.     }
  36.  
  37.     @Override
  38.     public void run() {
  39.         String name = Thread.currentThread().getName();
  40.         ThreadLocalRandom random = ThreadLocalRandom.current();
  41.         try {
  42.             System.out.printf("[%s] Sending message '%s'...%n", name, message);
  43.             Thread.sleep(random.nextInt(50, 300));
  44.             System.out.printf("[%s] Message '%s' successfully sent!%n", name, message);
  45.         } catch (InterruptedException e) {
  46.             System.err.printf("[%s] Received interrupt signal, exiting...%n", name);
  47.         }
  48.     }
  49. }
  50.  
  51. class Producer implements Runnable {
  52.     private final BlockingQueue<String> queue;
  53.     private ExecutorService service;
  54.  
  55.     Producer(ExecutorService service, BlockingQueue<String> queue) {
  56.         this.service = service;
  57.         this.queue = queue;
  58.     }
  59.  
  60.     @Override
  61.     public void run() {
  62.         String threadName = Thread.currentThread().getName();
  63.         System.out.printf("[%s] Producer started. Enter \"exit\" to stop, or another string to " +
  64.                 "send it over message queue%n", threadName);
  65.         while(!(Thread.currentThread().isInterrupted())){
  66.             try{
  67.                 String message = queue.take();
  68.                 service.submit(new Worker(message));
  69.             }catch (Exception e) {
  70.                 System.out.printf("[%s] IOException in producer, exiting...", threadName);
  71.             }
  72.         }
  73.         System.out.printf("[%s] Producer shutdown", threadName);
  74.     }
  75. }
  76.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
Main.java:6: error: class App is public, should be declared in a file named App.java
public class App{
       ^
1 error
stdout
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Standard output is empty
https://ideone.com/E7vkrw
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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