如何学习一门知识

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public class BlockingQueueTest {
    public static void main(String[] args) {
        BlockingQueue<String> blockingQueue = new SynchronousQueue<>();

        new Thread(() -> {
            try {
                System.out.println(Thread.currentThread().getName() + "\t put A ");
                blockingQueue.put("A");

                System.out.println(Thread.currentThread().getName() + "\t put B ");
                blockingQueue.put("B");

                System.out.println(Thread.currentThread().getName() + "\t put C ");
                blockingQueue.put("C");

            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }, "t1").start();

        new Thread(() -> {
            try {

                try {
                    TimeUnit.SECONDS.sleep(5);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                blockingQueue.take();
                System.out.println(Thread.currentThread().getName() + "\t take A ");

                try {
                    TimeUnit.SECONDS.sleep(5);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                blockingQueue.take();
                System.out.println(Thread.currentThread().getName() + "\t take B ");

                try {
                    TimeUnit.SECONDS.sleep(5);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                blockingQueue.take();
                System.out.println(Thread.currentThread().getName() + "\t take C ");

            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }, "t2").start();
    }
}
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