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...
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...
另一种是 使用区间表达式进行遍历 ; 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 代码运行次数:0 运行 AI代码解释 funmain(){// Kotlin 集合varlist:List<Int>=li...
// support for iterating either positions and elements//--- nested PositionIterator class ---/*** A (nonstatic) inner class. Note well that each instance* contains an implicit reference to the containing list,* allowing us to call the list's methods directly.*/privateclassPositionIteratorimp...
java迭代Iterator详解 一、Iterator的API 关于Iterator主要有三个方法:hasNext()、next()、remove() hasNext:没有指针下移操作,只是判断是否存在下一个元素 next:指针下移,返回该指针所指向的元素 remove:删除当前指针所指向的元素,一般和next方法一起用,这时候的作用就是删除next方法返回的元素...
import java.util.*; public class Muster { public static void main(String[] args) { ArrayList list = new ArrayList(); list.add("a"); list.add("b"); list.add("c"); Iterator it = list.iterator(); while(it.hasNext()){ String str = (String) it.next(); ...
import java.util.Iterator; import java.util.List; public class dem { public static void main(String[] args) { // TODO 自动生成的方法存根 List<String> lists=new ArrayList<>(); lists.add("java"); lists.add("OS"); lists.add("mysql"); ...
Added in 1.2. Java documentation forjava.util.ListIterator. Portions of this page are modifications based on work created and shared by theAndroid Open Source Projectand used according to terms described in theCreative Commons 2.5 Attribution License. ...
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...
In the above example, notice the statement: iterate.forEachRemaining((value) -> System.put.print(value +", ")); Here, we have passed thelambda expressionas an argument of theforEachRemaining()method. Now the method will print all the remaining elements of the array list....