Java by API/java.util.concurrent/BlockingDeque

BlockingDeque: takeLast()

  
import java.util.concurrent.BlockingDeque;
import java.util.concurrent.LinkedBlockingDeque;
class Producer implements Runnable {
  private String name;
  private BlockingDeque<Integer> deque;
  public Producer(String name, BlockingDeque<Integer> deque) {
    this.name = name;
    this.deque = deque;
  }
  public synchronized void run() {
    for (int i = 0; i < 10; i++) {
      try {
        deque.putFirst(i);
        System.out.println(name + " puts " + i);
        Thread.sleep(300);
      } catch (InterruptedException e) {
        e.printStackTrace();
      }
    }
  }
}
class Consumer implements Runnable {
  private String name;
  private BlockingDeque<Integer> deque;
  public Consumer(String name, BlockingDeque<Integer> deque) {
    this.name = name;
    this.deque = deque;
  }
  public synchronized void run() {
    for (int i = 0; i < 10; i++) {
      try {
        int j = deque.takeLast();
        System.out.println(name + " takes " + j);
        Thread.sleep(3000);
      } catch (InterruptedException e) {
        e.printStackTrace();
      }
    }
  }
}
public class Main {
  public static void main(String[] args) {
    BlockingDeque<Integer> deque = new LinkedBlockingDeque<Integer>(5);
    Runnable producer = new Producer("Producer", deque);
    Runnable consumer = new Consumer("Consumer", deque);
    new Thread(producer).start();
    try {
      Thread.sleep(500);
    } catch (InterruptedException e) {
      e.printStackTrace();
    }
    new Thread(consumer).start();
  }
}

BlockingQueue: take()

 
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
public class Main {
  public static void main(String[] argv) throws Exception {
    int capacity = 10;
    BlockingQueue<Integer> queue = new ArrayBlockingQueue<Integer>(capacity);
    int numWorkers = 2;
    Worker[] workers = new Worker[numWorkers];
    for (int i = 0; i < workers.length; i++) {
      workers[i] = new Worker(queue);
      workers[i].start();
    }
    for (int i = 0; i < 100; i++) {
      queue.put(i);
    }
  }
}
class Worker extends Thread {
  BlockingQueue<Integer> q;
  Worker(BlockingQueue<Integer> q) {
    this.q = q;
  }
  public void run() {
    try {
      while (true) {
        Integer x = q.take();
        if (x == null) {
          break;
        }
        System.out.println(x);
      }
    } catch (InterruptedException e) {
    }
  }
}