二、测试实例package com.inspur.Test;import java.util.ArrayList;import java.util.HashMap;import java.util.Iterator;import java.util.List;import java.util.Map;import java.util.Map.Entry;/***@author WHD*2015-3-5*/@Sup
Remove an Element 2.3. Iteration 2.4. Get an Element 3. ConclusionLokesh 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 ...
Oracle JDK7/8的逃逸分析（escape analysis）可以抵消掉for-in循环里隐式创建的Iterator：ArrayList$Itr，...
al.set(5, "F"); // It will not throw ConcurrentModificationException during Iteration. String str = itr.next(); System.out.println(str); } System.out.println(al); } } Output: [A, B, null, D, E, H] A B null D E H [A, B, null, D, E, F] 正如您在上面的程序中观察到...
Array 是指定固定大小的,而 ArrayList 大小是自动扩展的。...Array 内置方法没有 ArrayList 多,比如 addAll、removeAll、iteration 等方法只有 ArrayList 有。...(3)ListIterator从Iterator接口继承,然后添加了一些额外的功能,比如添加一个元素、替换一个元素、获取前面或后面元素的索引位置。
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 return...
As we can see, the iteration implementation is pretty neat as well. However, we have only oneforloop, and in the loop body, we have only one single statement. Next, let’s understand how it works. We defined two pointers,iandj, on the given list.The pointerjalways points to the last...
首先看看java.util.Iterator接口的定义: public interface Iterator { boolean hasNext(); Object next(); void remove(); } 1. 2. 3. 4. 5. 依赖前两个方法就能完成遍历,典型的代码如下: for(Iterator it = c.iterator(); it.hasNext(); ) { ...
java集合【8】-- ArrayList接口源码解析 1. ArrayList ArrayList是最最常用的集合类了,真的没有之一。下面的分析是基于1.8.0_261源码进行分析的。 1.1 ArrayList特点介绍 动态数组,使用的时候,只需要操作即可,内部已经实现扩容机制。 线程不安全 有顺序,会按照添加进去的顺序排好...
Performs the given action for each element of theIterableuntil all elements have been processed or the action throws an exception. Unless otherwise specified by the implementing class, actions are performed in the order of iteration (if an iteration order is specified). Exceptions thrown by the ac...