比如说 java Object[] objcts 这种保存对象的数组和基本类型的类型的数组会不同吗？
回复内容：
比如说 java Object[] objcts 这种保存对象的数组和基本类型的类型的数组会不同吗？
一样快，数组在初始化的时候就分配了数组大小的连续内存地址。所以根据索引下标直接取对应下标的值。对于 Object[]，它里面实际存放的是对象的引用。Object[]和普通类型的数组的区别只是前者存放的是Object，自然可以是所有继承自Object的对象都可以，如int，shot, String等，后者只能存放声明的基本类型
对于你刚才给出的例子来说，是一样快
是一样快的，都是根据索引来判断地址取值的。
一样快的,PHP数组用hashTable实现,每个键值对(其实是键名)会被hash一次,放入制定的bucket,数字索引不需要hash,如果有冲突就用链接法接在之前一个元素后面,hashTable里面包含两个指针:
Bucket pListHead; / 数组头元素指针 */
Bucket pListTail; / 数组尾元素指针 */
所以是无论取第一个还是第二个都是一样的.
对了,顺便说一下,hashTable是一个结构体,里面还有一个一个成员:
uint nNumOfElements;
用count()函数返回就是整个值,所以count其实并没有遍历数组
How to modify array elements in PHP?May 15, 2025 pm 08:21 PMMethods to modify array elements in PHP include direct assignment and batch modification using functions. 1. For indexed arrays, such as $colors=['red','green','blue'], the second element can be modified by $colors[1]='yellow'. 2. For associative arrays, such as $person=['name'=>'John','age'=>30], the value of age can be modified by $person['age']=31. 3. Use array_map or array_walk functions to modify array elements in batches, such as $numbers=array_map(fun
How to implement hook function in PHP?May 15, 2025 pm 08:18 PMImplementing hook functions in PHP can be implemented through observer mode or event-driven programming. The specific steps are as follows: 1. Create a HookManager class to register and trigger hooks. 2. Use the registerHook method to register the hook and trigger the hook by the triggerHook method when needed. Hook functions can improve the scalability and flexibility of the code, but pay attention to performance overhead and debugging complexity.
PHP Performance Tuning for High Traffic WebsitesMay 14, 2025 am 12:13 AMThesecrettokeepingaPHP-poweredwebsiterunningsmoothlyunderheavyloadinvolvesseveralkeystrategies:1)ImplementopcodecachingwithOPcachetoreducescriptexecutiontime,2)UsedatabasequerycachingwithRedistolessendatabaseload,3)LeverageCDNslikeCloudflareforservin
Dependency Injection in PHP: Code Examples for BeginnersMay 14, 2025 am 12:08 AMYou should care about DependencyInjection(DI) because it makes your code clearer and easier to maintain. 1) DI makes it more modular by decoupling classes, 2) improves the convenience of testing and code flexibility, 3) Use DI containers to manage complex dependencies, but pay attention to performance impact and circular dependencies, 4) The best practice is to rely on abstract interfaces to achieve loose coupling.
PHP Performance: is it possible to optimize the application?May 14, 2025 am 12:04 AMYes,optimizingaPHPapplicationispossibleandessential.1)ImplementcachingusingAPCutoreducedatabaseload.2)Optimizedatabaseswithindexing,efficientqueries,andconnectionpooling.3)Enhancecodewithbuilt-infunctions,avoidingglobalvariables,andusingopcodecaching
PHP Performance Optimization: The Ultimate GuideMay 14, 2025 am 12:02 AMThekeystrategiestosignificantlyboostPHPapplicationperformanceare:1)UseopcodecachinglikeOPcachetoreduceexecutiontime,2)Optimizedatabaseinteractionswithpreparedstatementsandproperindexing,3)ConfigurewebserverslikeNginxwithPHP-FPMforbetterperformance,4)
PHP Dependency Injection Container: A Quick StartMay 13, 2025 am 12:11 AMAPHPDependencyInjectionContainerisatoolthatmanagesclassdependencies,enhancingcodemodularity,testability,andmaintainability.Itactsasacentralhubforcreatingandinjectingdependencies,thusreducingtightcouplingandeasingunittesting.
Dependency Injection vs. Service Locator in PHPMay 13, 2025 am 12:10 AMSelect DependencyInjection (DI) for large applications, ServiceLocator is suitable for small projects or prototypes. 1) DI improves the testability and modularity of the code through constructor injection. 2) ServiceLocator obtains services through center registration, which is convenient but may lead to an increase in code coupling.
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Dreamweaver Mac version
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
WebStorm Mac version
Useful JavaScript development tools
Atom editor mac version download
The most popular open source editor
DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software
