JUC 详解 -> SynchronousQueue同步队列

• SynchronousQueue
  

import java.util.concurrent.BlockingQueue;
import java.util.concurrent.SynchronousQueue;
import java.util.concurrent.TimeUnit;
/**
 * SynchronousQueue同步队列
 * 与其他的BlockingQueue不同，SynchronousQueue不存储元素
 * put一个元素，必须先take元素，否则不能再put一个元素了
 */
public class SynchronousQueueDemo {
    public static void main(String[] args) {
        BlockingQueue<String> synchronousQueue = new SynchronousQueue<>();

        new Thread(()->{
            try {
                System.out.println(Thread.currentThread().getName()+" put 1");
                synchronousQueue.put("1");
                System.out.println(Thread.currentThread().getName()+" put 2");
                synchronousQueue.put("2");
                System.out.println(Thread.currentThread().getName()+" put 3");
                synchronousQueue.put("3");
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        },"Thread1").start();

        new Thread(()->{
            try {
                TimeUnit.SECONDS.sleep(2);
                System.out.println(Thread.currentThread().getName()+" take "+synchronousQueue.take());
                TimeUnit.SECONDS.sleep(2);
                System.out.println(Thread.currentThread().getName()+" take "+synchronousQueue.take());
                TimeUnit.SECONDS.sleep(2);
                System.out.println(Thread.currentThread().getName()+" take "+synchronousQueue.take());
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        },"Thread2").start();
    }
}