A Queue that additionally supports operations that wait for the queue to become non-empty when retrieving an element, and wait for space to become available in the queue when storing an element. BlockingQueue methods come in four forms, with different ways of handling operations that cannot be ...
ArrayBlockingQueue也是采用数组存储数据的,但是它继承自AbstractQueue,之所以它是Blocking的是因为当put或poll数据时,如果Queue是满的或者没有数据,当前线程将阻塞等待,直到满足条件或当前线程被其他线程中断。它通过ReetranLock及其两个信号量notfFull和notEmpty实现线程安全的。构造函数如下: public ArrayBlockingQueue(int...
Summary of Queue methods Throws exception Returns special value Insert add(e) offer(e) Remove remove() poll() Examine element() peek() 队列通常(但不一定)以FIFO(先进先出)方式对元素进行排序。 其中的例外是优先级队列,它根据提供的比较器对元素进行排序,或者元素的自然顺序,以及LIFO队列(或堆栈),它...
In this section we will discuss some of the useful and frequently used Java Queue methods: 在本节中,我们将讨论一些有用且经常使用的Java Queue方法: int size(): to get the number of elements in the Set. boolean isEmpty(): to check if Set is empty or not. boolean contains(Object o): ...
ArrayList、LinkedList、Queue、Deque(Queue 和Deque 是两个接口,其实现是 LinkedList,所以也是非线程安全的)。 HashMap、TreeMap、LinkedHashMap、WeakHashMap、IdentifyHashMap HashSet、TreeMap、LinkedHashSet 线程安全的集合类: Vector、Stack、 CopyOnWriteArrayList(JDK 1.5) Hashtable、ConcurrentHashMap(JDK 1.5) 上...
*A{@link java.util.Queue}that additionally supports operations*that waitforthe queue to become non-empty when retrieving an*element,and waitforspace to become availableinthe queue when*storing an element. 简单来说,阻塞队列就是能够支持等待队列不为空时在进行获取元素和当队列有空间时再进行存储...
(3)不论进入、出去的先后顺序是怎样的,使用 remove(),poll() 方法操作的都是 头部 的元素;而插入的位置则不一定是在队尾了,不同的 queue 会有不同的插入逻辑。 二、PriorityQueue实现类 PriorityQueue是一个比较标准的队列实现类。PriorityQueue保存队列元素的顺序并不是按加入队列的顺序,而是按队列元素的大小进行...
Retrieves and removes the head of this queue. Methods declared in interface java.util.Collection addAll,clear,contains,containsAll,equals,hashCode,isEmpty,iterator,parallelStream,remove,removeAll,removeIf,retainAll,size,spliterator,stream,toArray,toArray,toArray ...
ArrayBlockingQueue与Condition是组合关系,ArrayBlockingQueue中包含两个Condition对象(notEmpty和notFull)。而且,Condition又依赖于ArrayBlockingQueue而存在,通过Condition可以实现对ArrayBlockingQueue的更精确的访问 -- (01)若某线程(线程A)要取数据时,数组正好为空,则该线程会执行notEmpty.await()进行等待;当其它某个线...
Methods declared in class java.util.AbstractCollection containsAll, isEmpty, toString Methods declared in class java.lang.Object clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait Methods declared in interface java.util.concurrent.BlockingQueue poll, take Methods declared...