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()
本示例将使用其逆序遍历ArrayList。 思路分析:要逆序遍历某个列表,首先要获得一个ListIterator对象,利用for()循环,以ListIterator类的hasNext()方法作为判断条件,通过循环执行ListIterator类的next()方法将游标定位到列表结尾,然后在另一个for循环中,以ListIterator类的hasPrevious()方法作为判断条件,通过ListIterator类的pr...
package java.util; import java.util.function.Consumer; 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 (ha...
listIterator() This method returns a fail-fast list iterator over the elements in this list (in proper sequence). Features 1. ArrayList maintains the insertion order. I have given a simple Java program below that shows, ArrayList maintains the insertion order. import java.util.ArrayList; /**...
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...
This map guarantees that the map will be in both ascending key and value order. Other than key and value ordering, the goal with this structure is to avoid duplication of elements (unlike in HashBidiMap), which can be significant if contained elements are large. Implements BidiMap, Iterator...