public interface Iterable<T> { /** * Returns an {@link Iterator} for the elements in this object. * * @return An {@code Iterator} instance. */ Iterator<T> iterator(); } 本篇文章将介绍 Iterator 迭代器。 在介绍 Iterator 之前不得不提一下被它替代的 Enumeration< E >: Enumeration< E ...
hello Exception in thread"main"java.util.ConcurrentModificationExceptionatjava.util.ArrayList$Itr.checkForComodification(ArrayList.java:911)atjava.util.ArrayList$Itr.next(ArrayList.java:861)atmoudle2.Test15.main(Test15.java:17)Process finished with exit code1 因为此时集合本身被破坏了,迭代出现错误。 ...
} 在next方法中首先调用了checkForComodification方法,该方法会判断modCount是否等于expectedModCount,不等于就会抛出java.util.ConcurrentModificationExcepiton异常。 注:modCount是ArrayList的一个属性,继承自抽象类AbstractList,用于表示ArrayList对象被修改次数(add、remove、clear、ensureCapacityInternal均会改变modCount值)。...
* *该字段由迭代器和列表迭代器实现使用,由{@code迭代器}和{@code listtiterator}方法返回。 *如果该字段的值发生了意外变化,迭代器(或列表)将返回该字段迭代器)将抛出{@code ConcurrentModificationException} *在响应{@code next}, {@code remove}, {@code previous},{@code set}或{@code add}操作。这...
This adherence ensures compatibility across various data structures and facilitates a more cohesive and conversational approach to iteration in Java. Example Code: importjava.util.Iterator;importjava.util.NoSuchElementException;publicclassCustomIteratorExampleimplementsIterator<String>{privateString[]elements;priva...
import java.util.function.Consumer; /** * An iterator over a collection. {@code Iterator} takes the place of * {@link Enumeration} in the Java Collections Framework. Iterators * differ from enumerations in two ways: * 集合上的迭代器。Iterator 在Java集合框架中取代了Enumeration。
Data Structures and Algorithms in Java, 6th Editionlearning.oreilly.com/library/view/data-structures-and/9781118771334/11_chap07.html#chap07 迭代器是一种scanning through一系列元素,每次一个的一种软件设计模式。底层的迭代元素可能是被一个容器类所存储,也有可能是经过一系列的运算生成的。
Source Code on Github Comments Subscribe 0Comments Lokesh Gupta A fun-loving family man, passionate about computers and problem-solving, with over 15 years of experience in Java and related technologies. An avid Sci-Fi movie enthusiast and a fan of Christopher Nolan and Quentin Tarantino. ...
Note: Trying to remove items using a for loop or a for-each loop would not work correctly because the collection is changing size at the same time that the code is trying to loop.Exercise? What is a correct syntax to create an Iterator object named it for a cars collection? Iterator<...
Sample Java code to demonstrate Iterator and Enumeration classEnumerationExample{publicstaticvoidmain(Stringargs[]){Listlist=newArrayList(Arrays.asList(newString[]{"Apple","Cat","Dog","Rat"}));Vectorv=newVector(list);delete(v,"Dog");}privatestaticvoiddelete(Vectorv,Stringname){Enumeratione=v....