Java Blocking Queue

//Listing 8-1. The Blocking Queue Equivalent of Chapter 3’s PC Application

import java.util.concurrent.ArrayBlockingQueue;

import java.util.concurrent.BlockingQueue;

import java.util.concurrent.ExecutorService;

import java.util.concurrent.Executors;

public class A

{

    public static void main(String[] args)

    {

        final BlockingQueue<Character> bq;

        bq = new ArrayBlockingQueue<Character>();

        final ExecutorService executor = Executors.newFixedThreadPool();

        Runnable producer = () ->

        {

            for (char ch = 'A'; ch <= 'Z'; ch++)

            {

                try

                {

                    bq.put(ch);

                    System.out.printf("%c produced by " + "producer.%n", ch);

                }

                catch (InterruptedException ie)

                {

                }

            }

        };

        executor.execute(producer);

        Runnable consumer = () ->

        {

            char ch = '\0';

            do

            {

                try

                {

                    ch = bq.take();

                    System.out.printf("%c consumed by " + "consumer.%n", ch);

                }

                catch (InterruptedException ie)

                {

                }

            }

            while (ch != 'Z');

            executor.shutdownNow();

        };

        executor.execute(consumer);

    }

}