Remarks To guarantee the thread safety of theArrayList, all operations must be done through this wrapper. Enumerating through a collection is intrinsically not a thread-safe procedure. Even when a collection is synchronized, other threads can still modify the collection, which causes the enumerator t...
/*** Returns a synchronized (thread-safe) list backed by the specified * list. In order to guarantee serial access, it is critical that * all access to the backing list is accomplished * through the returned list. * * It is imperative that the user manually synchronize on the returned *...
Thread th = new Thread(group, t, String.valueOf(i));th.start();} while (group.activeCount() > 0) { Thread.sleep(10);} System.out.println();System.out.println(t.list1.size()); // it should be 10000 if thread safe collection is used.} } ...
我建议使用BlockingQueue接口的实现,而不是ArrayList。BlockingQueue就是thread-safe。 引用Javadoc: BlockingQueue实现是thread-safe。所有排队方法都是通过使用内部锁或其他形式的并发控制来实现其原子效果的。但是,除非在实现中另有指定,否则批量收集操作addAll、containsAll、retainAll和removeAll不一定以原子方式执行。例如,...
ArrayList实现了可变大小的数组。它允许所有元素,包括null。ArrayList没有同步。 size,isEmpty,get,set方法运行时间为常数。但是add方法开销为分摊的常数,添加n个元素需要O(n)的时间。其他的方法运行时间为线性。 每个ArrayList实例都有一个容量(Capacity),即用于存储元素的数组的大小。这个容量可随着不断添加新元素而自...
Thread th = new Thread(group, t,String.valueOf(i)); th.start(); } while (group.activeCount() > 0) { Thread.sleep(10); } System.out.println(); System.out.println(t.list1.size()); // it should be 10000 if thread safecollection is used. ...
Gets a value indicating whether access to the ArrayList is synchronized (thread safe). C# Копирај public virtual bool IsSynchronized { get; } Property Value Boolean true if access to the ArrayList is synchronized (thread safe); otherwise, false. The default is false. Implements ...
importjava.util.ArrayList;importjava.util.List;publicclassArrayListSafeTest{publicstaticvoidmain(String[]args)throws InterruptedException{final List<Integer>list=newArrayList<Integer>();// 线程A将1-1000添加到列表 new Thread(new Runnable() {@Overridepublicvoidrun(){for(int i=1;i<1000;i++){list....
//all operations are thread-safe concurrentList.add("a"); for (String token : concurrentList) { System.out.print(token); } 值得庆幸的是,因为CopyOnWriteArrayList在每次变异操作中都会创建一个新的数组副本,所以即使其他线程正在修改列表,我们也不会遇到ConcurrentModificationException异常。
i < 10000; i++) { Thread th = new Thread(group, t, String.valueOf(i));th.start();} while (group.activeCount() > 0) { Thread.sleep(10);} System.out.println();System.out.println(t.list1.size()); // it should be 10000 if thread safe collection is used.} } 首...