listiterator

Passing a List Iterator to multiple Threads in Java

由 允我心安 提交于 2021-02-07 03:08:46
问题 I have a list that contains roughly 200K elements. Am I able to pass the iterator for this list to multiple threads and have them iterate over the whole lot, without any of them accessing the same elements? This is what I am thinking of at the moment. Main: public static void main(String[] args) { // Imagine this list has the 200,000 elements. ArrayList<Integer> list = new ArrayList<Integer>(); // Get the iterator for the list. Iterator<Integer> i = list.iterator(); // Create MyThread,

Passing a List Iterator to multiple Threads in Java

由 若如初见. 提交于 2021-02-07 03:08:24
问题 I have a list that contains roughly 200K elements. Am I able to pass the iterator for this list to multiple threads and have them iterate over the whole lot, without any of them accessing the same elements? This is what I am thinking of at the moment. Main: public static void main(String[] args) { // Imagine this list has the 200,000 elements. ArrayList<Integer> list = new ArrayList<Integer>(); // Get the iterator for the list. Iterator<Integer> i = list.iterator(); // Create MyThread,

How can I access a element of a IReadOnlyCollection through it index?

由 情到浓时终转凉″ 提交于 2020-05-25 09:49:20
问题 I am working with selenium and I am using the function FindElements so I am getting a element that implements IReadOnlyCollection interface. I want to iterate through the list but it seems that IReadOnlyCollection doesnt have any method like Get(int index) or a implementation of the operation []. I want to avoid transforming the result to a List or to an array since I just want to access the elements to read them. Currently I don't want to use a foreach since I need to manage an index so I

How can I access a element of a IReadOnlyCollection through it index?

由 瘦欲@ 提交于 2020-05-25 09:48:45
问题 I am working with selenium and I am using the function FindElements so I am getting a element that implements IReadOnlyCollection interface. I want to iterate through the list but it seems that IReadOnlyCollection doesnt have any method like Get(int index) or a implementation of the operation []. I want to avoid transforming the result to a List or to an array since I just want to access the elements to read them. Currently I don't want to use a foreach since I need to manage an index so I

How can I access a element of a IReadOnlyCollection through it index?

由 跟風遠走 提交于 2020-05-25 09:48:07
问题 I am working with selenium and I am using the function FindElements so I am getting a element that implements IReadOnlyCollection interface. I want to iterate through the list but it seems that IReadOnlyCollection doesnt have any method like Get(int index) or a implementation of the operation []. I want to avoid transforming the result to a List or to an array since I just want to access the elements to read them. Currently I don't want to use a foreach since I need to manage an index so I

Java集合框架之Iterator和ListIterator

由 Deadly 提交于 2020-03-01 02:48:00
一、 前言 迭代器是一个对象,它可以让你遍历一个容器并且有选择性的删除 容器 中的元素,而我们不需要知道 容器 的内部结构.Java有两种原生的迭代器:Iterator和ListIterator, 其中 ListIterator继承自 Iterator. 二、 Iterator接口 Iterator 通常被称为轻量级对象,因为创建它的开销比较小.可以通过调用 容器 的 iterator ()方法来获取它的Iterator. 下面是 Iterator 接口定义: 代码清单-1 public interface Iterator<E> { boolean hasNext(); E next(); default void remove() { throw new UnsupportedOperationException("remove"); } default void forEachRemaining(Consumer<? super E> action) { Objects.requireNonNull(action); while (hasNext()) action.accept(next()); } } Java的 Iterator只能单向移动,它只能用来: (1)使用容器的 iterator ()方法返回它的Iterator.Iterator将返回容器的第一个元素. (2

In the Boost Graph Library, why does adding an edge invalidate Edge iterators (and other questions)?

由 冷暖自知 提交于 2020-01-04 05:17:19
问题 A few questions about the chart in the BGL documentation labeled "Summary of Descriptor and Iterator Invalidation": Why does adding an edge invalidate the edge and adjacency iterators; why isn't every column of the add_edge() row "OK"? Wouldn't the in/out edge lists simply be appended? Why does removing an edge only invalidate an edge iterator if the graph is directed; why is the second to last column in the second row not simply "EL=vecS"? In the undirected graph case wouldn't removing an

How to format a table in Struts2?

由 杀马特。学长 韩版系。学妹 提交于 2019-12-24 22:40:21
问题 I need to format it in a way that show the four headers on the top and all the fields under them. but it creates extra tds and trs. <form name="edit" method="POST" action="edit"> <table border="4"> <thead><tr> <td>Field1</td><td>Field2</td><td>Field3</td<td>Field4</td> </tr> </thead> <tbody> <s:iterator value="basket.items" var="item" status="element"> <tr> <td> <s:textfield type="hidden" id="item[%{#element.index}].id" name="item[%{#element.index}].id" value="%{id/></td> <td> <s:textfield id

Concurrent Modification Exception in Java [duplicate]

由 ￡可爱￡侵袭症＋ 提交于 2019-12-23 19:23:51
问题 This question already has answers here : Iterating through a Collection, avoiding ConcurrentModificationException when removing objects in a loop (24 answers) Closed 2 years ago . I am getting the ConcurrentModificationException while executing this code. I am unable to figure out why it is happening? private void verifyBookingIfAvailable(ArrayList<Integer> list, int id) { Iterator<Integer> iterator = list.iterator(); while (iterator.hasNext()) { int value = iterator.next(); if (value == id)
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