What do you mean by BlockingQueue in java?

Problem statement:
How do you write a program to implement producer-consumer problem using BlockingQueue?

[1] Producer.java

import java.util.concurrent.BlockingQueue;

public class Producer implements Runnable {

    BlockingQueue queue = null;

    Producer(BlockingQueue queue) {

        this.queue = queue;

    }

    @Override

    public void run() {

        for (int i = 1; i <= 12; i++) {

            System.out.println("Produced item " + i);

            try {

                queue.put("item " + i);

            } catch (InterruptedException e) {

                e.printStackTrace();

            }

        }

    }

}

[2] Consumer.java

import java.util.concurrent.BlockingQueue;

public class Consumer implements Runnable {

    BlockingQueue queue = null;

    public Consumer(BlockingQueue queue) {

        super();

        this.queue = queue;

    }

    @Override

    public void run() {

        while (true) {

            try {

                System.out.println("Consumed " + queue.take());

            } catch (InterruptedException e) {

                e.printStackTrace();

            }

        }

    }

}

[3] BlockingQueueExecution.java

import java.util.concurrent.ArrayBlockingQueue;

import java.util.concurrent.BlockingQueue;

public class BlockingQueueExecution {

    public static void main(String args[]) {

        BlockingQueue queue = new ArrayBlockingQueue(10); // here capacity= 10

        Producer producer = new Producer(queue);

        Consumer consumer = new Consumer(queue);

        new Thread(producer).start();

        new Thread(consumer).start();

    }

}

Output:

Produced item 1

Consumed item 1

Produced item 2

Consumed item 2

Produced item 3

Consumed item 3

Produced item 4

Produced item 5

Consumed item 4

Produced item 6

Consumed item 5

Produced item 7

Consumed item 6

Produced item 8

Consumed item 7

Produced item 9

Consumed item 8

Produced item 10

Consumed item 9

Produced item 11

Consumed item 10

Produced item 12

Consumed item 11

Consumed item 12