同步佇列（SynchronizedQueue）存一個值必須先取出存入的值，才能繼續存值，可以理解為容量為0的BlockingQueue。如果想存兩個值，那就會一直等待阻塞。注意需要線上程中使用，普通方法使用時會發生阻塞

package com.luoKing.BlockingQueue;

import java.util.concurrent.SynchronousQueue;

public class sychronizedQueueDemo {
    public static void main(String[] args) throws InterruptedException {
        SynchronousQueue<String> queue = new SynchronousQueue<>();
        new Thread(
                () -> {
                    try {
                        System.out.println(Thread.currentThread().getName()+" put a ");
                        queue.put("a");
                        System.out.println(Thread.currentThread().getName()+" put b ");
                        queue.put("b");
                        System.out.println(Thread.currentThread().getName()+" put c ");
                        queue.put("c");
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
        ,"put").start();

        new Thread(()->{
            try {
                System.out.println(queue.take());
                System.out.println(queue.take());
                System.out.println(queue.take());
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }).start();


    }
}
//執行結果

put put a 
a
put put b 
b
put put c 
c