remove(int index)移除指定位置元素 importjava.util.ArrayList;importjava.util.Iterator;importjava.util.List;publicclassArrayListTest {publicstaticvoidmain(String[] args) { List a=newArrayList(); String s1="hello"; String s2="world"; a.add(s1); a.add(s2); a.add(0,"happy"); a.add(3);f...
先看看JAVA API对ListIterator的说明: 需要注意的是nextIndex只是返回一个index,并没有修改其他的东西。而next取下一个index的元素不单单是取里面的元素,而且其游标(java没有指针,但这里的概念类似于指针)也会移动。在JAVA中有许多这样的情况发生。 打个比方,假如当前遍历的是序号为0的元素。当使用nextIndex()函数...
ListIterator 用于允许程序员沿任一方向遍历列表的列表的迭代器,在迭代期间修改列表,并获取列表中迭代器的当前位置。 A ListIterator没有电流元素; 其光标位置始终位于通过调用previous()返回的元素和通过调用next()返回的元素next() 。 长度为n的列表的迭代器具有n+1可能的光标位置,如下图所示的^ ( ^ )所示: E...
package com.lgl.hellojava; import java.util.ArrayList; import java.util.Iterator; import javax.print.attribute.standard.MediaSize.Other; //公共的 类 类名 public class HelloJJAVA { public static void main(String[] args) { listiterator(); } /** * 演示列表迭代器 */ public static void list...
Java ArrayList.listIterator() returns a bi-directional list iterator that iterates over the elements of the current list.
简介:JAVA之旅(十八)——基本数据类型的对象包装类,集合框架,数据结构,Collection,ArrayList,迭代器Iterator,List的使用 JAVA把完事万物都定义为对象,而我们想使用数据类型也是可以引用的一. JAVA之旅(十八)——基本数据类型的对象包装类,集合框架,数据结构,Collection,ArrayList,迭代器Iterator,List的使用 ...
1. UsingCollections.synchronizedList() ThesynchronizedList()returns asynchronizedandthread-safe listbacked by the specified list. ListsyncList=Collections.synchronizedList(arraylist); It is recommended that we shouldmanually synchronizethe returned list when traversing it viaIterator,SpliteratororStreamelse it ...
In addition to implementing the List interface, this class provides methods to manipulate the size of the array that is used internally to store the list. (This class is roughly equivalent to Vector, except that it is unsynchronized.) The size, isEmpty, get, set, iterator, and listIterator...
Thesize,isEmpty,get,set,iterator, andlistIteratoroperations run in constant time. Theaddoperation runs inamortized constant time, that is, adding n elements requires O(n) time. All of the other operations run in linear time (roughly speaking). The constant factor is low compared to that for...
In addition to implementing the List interface, this class provides methods to manipulate the size of the array that is used internally to store the list. (This class is roughly equivalent to Vector, except that it is unsynchronized.) The size, isEmpty, get, set, iterator, and listIterator...