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(...
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...
Java中不变模式相关技术有:final关键字 和String类型 常用的工具类 : hashtable 和 vector stack ,Collections.synchronizedXXX() 方法。 在Java类库中出现的第一个集合类是Hashtable,它是JDK1.0的一部分,Hashtable的所有方法都是同步的。 此时,无竞争的同步会导致可观的性能代价。Hashtable的后继者HashMap是作为JDK1...
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...
Constructs a deque initially containing the elements of the given collection, added in traversal order of the collection's iterator. ConcurrentLinkedDeque(IntPtr, JniHandleOwnership) A constructor used when creating managed representations of JNI objects; called by the runtime. ...
JavaFinalize() Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. (Inherited from Object) Keys() Returns an enumeration of the keys in this table. KeySet() To be added (Inherited from AbstractMap) MappingCount(...
java.util.concurrent Utility classes commonly useful in concurrent programming. javax.swing Provides a set of "lightweight" (all-Java language) components that, to the maximum degree possible, work the same on all platforms. Uses ofExecutionExceptioninjava.util.concurrent ...
在遍历Java容器(ArrayList, LinkedList, HashSet, TreeSet, HashMap, HashTable)过程中不允许向该容器中Add/Remove元素, 否则会抛出ConcurrentModificationException 但在Java 1.5版本以来, Java类库就提供了一个并发集合(Concurrent collection) CopyOnWriteArrayList, CopyOnWriteArraySet, ConcurrentHashMap, 这是专门为解决死...
package three_help_classes; import java.util.concurrent.CountDownLatch; public class Demo1_CountDownLatch { public static void main(String[] args) throws InterruptedException { // 创建计数器类 CountDownLatch countDownLatch = new CountDownLatch(4); for (int i = 0; i < 4; i++) { new ...
The ConcurrentModificationException generally occurs when working with Java Collections. The Collection classes in Java are very fail-fast and if they are attempted to be modified while a thread is iterating over it, a ConcurrentModificationException is thrown. This exception can occur in both mult...