新的元素插入到队列的尾部,队列检索操作从队列头部获得元素。当许多线程共享访问一个公共collection 时,ConcurrentLinkedQueue 是一个恰当的选择。此队列不允许 null 元素。 此实现采用了有效的“无等待 (wait-free)”算法。与大多数 collection 不同,size 方法不是 一个固定时间的操作。由于这些队列的异步特性,确定当...
which optimizes the process of iterating through the elements in a collection. However, the iterators implemented in thejava.utilCollections classes are fail-fast, which means that if one thread changes a collection while another thread is traversing it through anIterator, the nextIterator.hasNext(...
Thejava.util.concurrentpackage includes a number of additions to the Java Collections Framework. These are most easily categorized by the collection interfaces provided: BlockingQueuedefines a first-in-first-out data structure that blocks or times out when you attempt to add to a full queue, or ...
The methods of all classes in java.util.concurrent and its subpackages extend these guarantees to higher-level synchronized. In particular: Actions in a threadprior to placing an object into any concurrent collectionhappen-beforeactions subsequent to the access or removal of that element from the co...
Java中Consumer类型的参数 java concurrent collection 1.JDK1.4及之前 在JDK1.4及之前的版本,主要提供的并发技术有: synchronized关键字 volatile关键字 不变模式 :不变模式,就是指:在并发编程中,为确保数据的一致性和正确性,使用一种不可改变的对象。依靠其不可变的性质,来确保在没有同步的情况下依旧保持一致性和...
java.util.concurrent Class ConcurrentLinkedDeque<E> Type Parameters: E- the type of elements held in this collection All Implemented Interfaces: Serializable,Iterable<E>,Collection<E>,Deque<E>,Queue<E> public classConcurrentLinkedDeque<E>extendsAbstractCollection<E> implementsDeque<E>,Serializable ...
This replaces sequential collection classes in the java.util (j.u.) package with their concurrent ver- sions. 35 Table 1. Transformations for atomic refactoring Before transformation After transformation int sharedInt = 0; synchronized (lockObject) { sharedInt = sharedInt + 1; } j.u.c....
Here, the completer of each task is its parent in the computation tree. Even though they entail a bit more bookkeeping, CountedCompleters may be better choices when applying a possibly time-consuming operation (that cannot be further subdivided) to each element of an array or collection; ...
This class extends Number, but does not define methods such as equals, hashCode and compareTo because instances are expected to be mutated, and so are not useful as collection keys. Added in 1.8. Java documentation for java.util.concurrent.atomic.LongAccumulator.Portions of this...
concurrent package contains high-performance, thread-safe implementations for workhorse collection types List and Map. This month, Brian Goetz shows you how many concurrent programsGoetz, BrianBrian Gortz, ' Java theory and practice: Concurrent collections classes ', Jul. 23, 2003 (URL:http://www...