Iterator it = list.iterator();while (it.hasNext()) { System.out.print(it.next() +","); }for (Integer i : list) { System.out.print(i +","); } 第一种就是普通的for循环,第二种为迭代器遍历,第三种是for-in循环。后面两种方式涉及到Java中的iterator和iterable对象,接下来我们来看看这两...
比如下代码：publicvoidfoo(List<Object>list){//visit each element in listfor(inti=0;i<list.size...
import java.util.List; public class Fordemo { public static void main(String[] args) { int[] arr = {1,2,3}; for(int i:arr){ System.out.println(i); } String[] s = {"hello","world","java"}; for(String i:s){//注意这里的类型是String System.out.println(i); } List<String...
当添加元素时:The method add(String) in the type Collection<String> is not applicable for the arguments (int) (3)并发修改异常:ConcurrentModificationException;对集合进行增删操作; 迭代器不知道集合中的变化,容易发生调用的不确定性,[ListIterator了解即可] publicclassListIteratorDemo {publicstaticvoidmain(St...
二、For 循环遍历 Iterator 对象 提供了 Iterator 迭代器的对象基本就是集合或者数组对象 , 遍历格式 :for(元素in集合/数组对象){ 遍历内容 } 代码示例 : fun main() { // Kotlin 集合 var list : List<Int> = listOf<Int>(0, 1, 2, 3, 4) ...
Methods inherited from interface java.util.Iterator forEachRemaining Method Detail hasNext boolean hasNext() Returnstrueif this list iterator has more elements when traversing the list in the forward direction. (In other words, returnstrueifnext()would return an element rather than throwing an excepti...
Daniel (kabura) + 1 Iterator is an object that remember a position in a sequence of elements, and it's methods can get next element or has access to these elements ListIterator is the interface for iterators in List implementations. ArrayList<Integer> arr = new ArrayList<>(List.of(1,2,...
List<String>list=newArrayList<String>();for(int i=0;i<list.size();i++){String string=list.get(i);//do something} 对于这两种方式,我们总是都事先知道集合的内部结构,访问代码和集合本身是紧密耦合的,无法将访问逻辑从集合类和客户端代码中分离出来。同时每一种集合对应一种遍历方法,客户端代码无法复...
Namespace: Java.Util Assembly: Mono.Android.dll An iterator for lists that allows the programmer to traverse the list in either direction, modify the list during iteration, and obtain the iterator's current position in the list.C# 复制 ...
二、For 循环遍历 Iterator 对象 提供了 Iterator 迭代器的对象基本就是 集合 或者 数组 对象 , 遍历格式 :for ( 元素 in 集合/数组对象 ){ 遍历内容 } 代码示例 : 代码语言:javascript 复制 funmain(){// Kotlin 集合varlist:List<Int>=listOf<Int>(0,1,2,3,4)// Kotlin 数组vararray:IntArray=int...