7、Iteration(迭代) ArrayList provides more ways for iteration i.e. accessing all elements one by one than an array. You can only use loop e.g. for, while, enhanced for loop and do-while to iterate over an array but you can also use Iterator and ListIterator class to iterate over Arra...
A 3. Add and Remove Elements during Iteration ListIteratorsupports adding and removing elements in the list while we are iterating over it. listIterator.add(Element e)– The element is inserted immediately before the element that would be returned bynext()or after the element that would be re...
2. Difference in Performance 2.1. Add an Element 2.2. Remove an Element 2.3. Iteration 2.4. Get an Element 3. Conclusion 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...
如果已知是ArrayList，从性能角度考虑，两种方法差不多。但是从软工角度考虑，推荐使用iterator。因为你的...
实现Cloneable接口 这个类，在前面的java的深拷贝和浅拷贝章节中有说到过，知道浅拷贝可以通过调用Object....
Creating a Generic ArrayList object can also be done in separate lines like this: ArrayList<String> arlist; arlist = new ArrayList(); 注意:我们不能使用原始数据类型作为类型。例如,ArrayList<int>是非法的。 Java ArrayList Initialization 在Java 中初始化数组列表有三种方法。它们如下: ...
* (In other words, returns {@codetrue} if {@link#next} would * return an element rather than throwing an exception.) * *@return{@codetrue} if the iteration has more elements*/booleanhasNext();/*** Returns the next element in the iteration. ...
accept((E) elementData[i++]); } // update once at end of iteration to reduce heap write traffic cursor = i; lastRet = i - 1; checkForComodification(); } } 需要注意的是这里有一个Java集合的fail-fast事件。你可能已经注意到,我们在调用add()、remove()这些修改集合的方法时,都会修改一个...
// update once at end of iteration to reduce heap write traffic cursor = i; lastRet = i - 1; checkForComodification(); } final void checkForComodification() { if (modCount != expectedModCount) throw new ConcurrentModificationException(); ...
文章分类 Java 后端开发 本章我们讲解ArrayList。先对ArrayList有个整体认识,再学习它的源码,最后再通过例子来学习如何使用它。内容包括: 一、ArrayList简介 1.ArrayList 介绍 2.ArrayList构造函数 3.ArrayList的API(JDK1.8) 二、ArrayList数据结构 1.ArrayList的继承关系 2.ArrayList与Collection关系如下图: 三、ArrayL...