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Java面试题

Java面试题文章目录1、抽象类和接口的区别2、重载和重写的区别3、==和equals的区别4、讲一讲什么是map、set、list5、HashMap原理6、什么是JSP？

路飞Fly了·2024-09-07 02:08

Java Virtual Machine One

jvm结构类加载子系统：类加载器验证准备解析数据运行时数据区：1.方法区类信息方法信息常量池2.堆体系:线程共享区域堆存放new的对象3.栈线程私有的存放线程执行过程的方法信息（存储单位为栈帧）4.程序计时器执行线程的行号计时器5.本地方法栈native方法栈执行引擎：将二进制的指令解释给操作系统栈虚拟栈:存储每个线程的栈结构，线程私有，栈中存储的元素是栈帧每个栈帧存储一个线程的方法信息，方法内部

LongProgrammer·2024-09-07 02:07

基于JAVA智能推荐二手车交易网站计算机毕业设计源码+系统+数据库+lw文档+部署

基于JAVA智能推荐二手车交易网站计算机毕业设计源码+系统+数据库+lw文档+部署基于JAVA智能推荐二手车交易网站计算机毕业设计源码+系统+数据库+lw文档+部署本源码技术栈：项目架构：B/S架构开发语言

光光网络·2024-09-07 02:07

html如何嵌套页面？标签告诉你答案</h4> </div> <div class="article-excerpt"> web<em>前端</em>全栈资料粉丝福利（面试题、视频、资料笔记、进阶路线）在这里小编首先介绍的是HTML中iframe标签的用法：怎么在一个网页中嵌入另一个网页呢，我们可以用html中的iframe标签搞定 </div> </a> <div class="newsitem-meta"> <span class=" votes-operation"> <span class="wrap"> <i class="glyphicon glyphicon-thumbs-up hot"></i> </span> <span class="author pr20"> PHP9年架构师<span class="dot">·</span>2024-09-07 02:06 </span> </span> <ul class="taglist--inline inline-block articletitle--tag"> </ul> </div> </div> </div> <div class="news-item streamitem clearfix mt15"> <div class="newsitem-info clearfix"> <a href="/article/1832120715910934528.htm" ></a> <a target="_blank" href="/article/1832120715910934528.htm"> <div class="mb5 mt5"> <h4 class="newsitem-title mt0">闷热的一天</h4> </div> <div class="article-excerpt"> 今天早上起床后，洗漱完，出<em>去做</em>了核算，回来做了烙茄子，凉拌黄瓜，吃了早饭。和孩子一起做了会儿暑假作业，嗯，这人的暑假作业到现在还没有做完，或者说还剩很多。做中饭，卤面。 </div> </a> <div class="newsitem-meta"> <span class=" votes-operation"> <span class="wrap"> <i class="glyphicon 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<div class="news__item-info clearfix"> <a href="/article/1832117274291564544.htm" ></a> <a target="_blank" href="/article/1832117274291564544.htm"> <div class="mb5 mt5"> <h4 class="newsitem-title mt0">2022的最后一个月，坚持做4件事</h4> </div> <div class="article-excerpt"> 放下你的迷茫，放下你的懒惰，放下你的三分钟热度，静下心来，<em>去做</em>你想做的事情。请相信，没有白费的努力，今天撒下的种子，正在你看不见的某处悄悄地发芽。 </div> </a> <div class="newsitem-meta"> <span class=" votes-operation"> <span class="wrap"> <i class="glyphicon glyphicon-thumbs-up hot"></i> </span> <span class="author pr20"> 于丹丹<span class="dot">·</span>2024-09-07 02:52 </span> </span> <ul class="taglist--inline inline-block articletitle--tag"> </ul> </div> </div> </div> <div class="news-item streamitem clearfix mt15"> <div class="news__item-info clearfix"> <a href="/article/1832117076580462592.htm" ></a> <a target="_blank" href="/article/1832117076580462592.htm"> <div class="mb5 mt5"> <h4 class="news__item-title mt0">docker启动es内存不够问题</h4> </div> <div class="article-excerpt"> docker启动es内存不够问题在启动的时候加上-eES_<em>JAVA</em>_OPTS=“-Xms=256m-Xmx=256m”参数，给es分配256m的内存大小dockerrun-d-p9200:9200-p9300 </div> </a> <div class="newsitem-meta"> <span class=" votes-operation"> <span class="wrap"> <i class="glyphicon glyphicon-thumbs-up hot"></i> </span> <span class="author pr20"> 想飞的rat<span class="dot">·</span>2024-09-07 02:05 </span> </span> <ul class="taglist--inline inline-block articletitle--tag"> <li class="tagPopup mb5"> <a class="tag" href="/search/docker/1.htm"> docker </a> </li> <li class="tagPopup mb5"> <a class="tag" href="/search/elasticsearch/1.htm"> elasticsearch </a> </li> <li class="tagPopup mb5"> <a class="tag" href="/search/java/1.htm"> java </a> </li> </ul> </div> </div> </div> <div class="news-item streamitem clearfix mt15"> <div class="newsitem-info clearfix"> <a href="/article/1832115942453243904.htm" class='news-img' style="background-image:url('http://img.e-com-net.com/image/info8/78a2d58ce58445b58c7a1099ff434f6c.jpg@!80x60')" ></a> <a target="_blank" 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style="background-image:url('http://img.e-com-net.com/image/info8/dca372153d074cf3831bc5ddf90f79d1.png@!80x60')" ></a> <a target="_blank" href="/article/1832115311013359616.htm"> <div class="mb5 mt5"> <h4 class="news__item-title mt0"><em>java</em> 内存划分_<em>Java</em>运行时内存划分</h4> </div> <div class="article-excerpt"> 如果程序执行的是一个<em>Java</em>方法，则计数器记录的是正在执行的 </div> </a> <div class="newsitem-meta"> <span class=" votes-operation"> <span class="wrap"> <i class="glyphicon glyphicon-thumbs-up hot"></i> </span> <span class="author pr20"> 幸福的小酒瓶<span class="dot">·</span>2024-09-07 01:04 </span> </span> <ul class="taglist--inline inline-block articletitle--tag"> <li class="tagPopup mb5"> <a class="tag" href="/search/java/1.htm"> java </a> </li> <li class="tagPopup mb5"> <a class="tag" href="/search/%E5%86%85%E5%AD%98%E5%88%92%E5%88%86/1.htm"> 内存划分 </a> </li> </ul> </div> </div> </div> <div class="news-item streamitem clearfix mt15"> <div class="newsitem-info clearfix"> <a href="/article/1832114301469552640.htm" ></a> <a target="_blank" href="/article/1832114301469552640.htm"> <div class="mb5 mt5"> <h4 class="news__item-title mt0"><em>java</em> 运行内存_<em>Java</em>运行时内存区域</h4> </div> <div class="article-excerpt"> 一.运行时数据区域<em>Java</em>虚拟机在执行<em>Java</em>程序的过程中会把它所管理的内存划分为几个不同的数据区域，这些区域都有各自的用途，以及创建和销毁的时间，有的区域随着虚拟机进程的启动而存在，有的区域则依赖用户线程的启动和结束而建立和销毁 </div> </a> <div class="newsitem-meta"> <span class=" votes-operation"> <span class="wrap"> <i class="glyphicon glyphicon-thumbs-up hot"></i> </span> <span class="author pr20"> wb0r0r<span class="dot">·</span>2024-09-07 01:03 </span> </span> <ul class="taglist--inline inline-block articletitle--tag"> <li class="tagPopup mb5"> <a class="tag" href="/search/java/1.htm"> java </a> </li> <li class="tagPopup mb5"> <a class="tag" href="/search/%E8%BF%90%E8%A1%8C%E5%86%85%E5%AD%98/1.htm"> 运行内存 </a> </li> </ul> </div> </div> </div> <div class="news-item streamitem clearfix mt15"> <div class="newsitem-info clearfix"> <a href="/article/1832112691146223616.htm" ></a> <a target="_blank" href="/article/1832112691146223616.htm"> <div class="mb5 mt5"> <h4 class="newsitem-title mt0">加班</h4> </div> <div class="article-excerpt"> 这件事我必须<em>去做</em>，最好是现在！计划准备搭讪100个人！（我也不知道能不能做得到，但是试一下才知道结果 </div> </a> <div class="newsitem-meta"> <span class=" votes-operation"> <span class="wrap"> <i class="glyphicon glyphicon-thumbs-up hot"></i> </span> <span class="author pr20"> 0一鸣惊人0<span class="dot">·</span>2024-09-07 01:39 </span> </span> <ul class="taglist--inline inline-block articletitle--tag"> </ul> </div> </div> </div> <div class="news-item streamitem clearfix mt15"> <div class="news__item-info clearfix"> <a href="/article/1832110520895893504.htm" ></a> <a target="_blank" href="/article/1832110520895893504.htm"> <div class="mb5 mt5"> <h4 class="newsitem-title mt0"><em>java</em>运行时内存</h4> </div> <div class="article-excerpt"> <em>java</em>运行时内存分为“线程共享”和“线程私有”两部分共享的资源有：a.堆由于堆是在进程空间中开辟出来的，所以它是理所当然地被共享的；因此new出来的都是共享的（16位平台上分全局堆和局部堆，局部堆是独享的 </div> </a> <div class="newsitem-meta"> <span class=" votes-operation"> <span class="wrap"> <i class="glyphicon glyphicon-thumbs-up hot"></i> </span> <span class="author pr20"> 时闻折竹声<span class="dot">·</span>2024-09-07 01:02 </span> </span> <ul class="taglist--inline inline-block articletitle--tag"> <li class="tagPopup mb5"> <a class="tag" href="/search/%E5%A4%9A%E7%BA%BF%E7%A8%8B/1.htm"> 多线程 </a> </li> </ul> </div> </div> </div> <div class="news-item streamitem clearfix mt15"> <div class="news__item-info clearfix"> <a href="/article/1832108378466381824.htm" class='news-img' style="background-image:url('http://img.e-com-net.com/image/info8/e96e3199e0a3445dae06f15414a42f9e.jpg@!80x60')" ></a> <a target="_blank" href="/article/1832108378466381824.htm"> <div class="mb5 mt5"> <h4 class="news__item-title mt0">cannot import name ‘goods_dp‘ from partially initialized module ‘goods‘ 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事实上，要有现在就做的习惯，最重要的是要有积极主动的精神，戒除精神散漫的习惯，要决心做个主动精神的人，要勇于做事，不要等到万事俱备以后才<em>去做</em>，永远没有绝对完美的事。培养行动 </div> </a> <div class="newsitem-meta"> <span class=" votes-operation"> <span class="wrap"> <i class="glyphicon glyphicon-thumbs-up hot"></i> </span> <span class="author pr20"> 思谨<span class="dot">·</span>2024-09-07 01:26 </span> </span> <ul class="taglist--inline inline-block articletitle--tag"> </ul> </div> </div> </div> <div class="news-item streamitem clearfix mt15"> <div class="news__item-info clearfix"> <a href="/article/1832106085104840704.htm" ></a> <a target="_blank" href="/article/1832106085104840704.htm"> <div class="mb5 mt5"> <h4 class="newsitem-title mt0">你的痛苦无人能替</h4> </div> <div class="article-excerpt"> 从大学毕业再到研究生就读，自己也能慢慢赚些钱了，一直比较困扰的是我的牙齿，所以正畸一直是我想要<em>去做</em>的一件事。一个人生活之后，就不再想做家里的米虫，毕竟父母的钱都不是大风刮来的，来之不易。 </div> </a> <div class="newsitem-meta"> <span class=" votes-operation"> <span class="wrap"> <i class="glyphicon glyphicon-thumbs-up hot"></i> </span> <span class="author pr20"> 沫芃爱吃肉<span class="dot">·</span>2024-09-07 01:24 </span> </span> <ul class="taglist--inline inline-block articletitle--tag"> </ul> </div> </div> </div> <div class="news-item streamitem clearfix mt15"> <div class="news__item-info clearfix"> <a href="/article/1832105606878687232.htm" ></a> <a target="_blank" href="/article/1832105606878687232.htm"> <div class="mb5 mt5"> <h4 class="news__item-title mt0">docker 启动Elasticsearch镜像指令</h4> </div> <div class="article-excerpt"> dockerrun-d-eES_<em>JAVA</em>_POTS="-Xms256m-Xmx256m"-e"discovery.type=single-node"-p9200:9200-p9300:9300--nameES3502bab3f5e7d </div> </a> <div class="newsitem-meta"> <span class=" votes-operation"> <span class="wrap"> <i class="glyphicon glyphicon-thumbs-up hot"></i> </span> <span class="author pr20"> 免费的东西<span class="dot">·</span>2024-09-07 01:30 </span> </span> <ul class="taglist--inline inline-block articletitle--tag"> <li class="tagPopup mb5"> <a class="tag" href="/search/java/1.htm"> java </a> </li> <li 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1.概念：一个<em>java</em>程序从编译到执行，大概经历过4个步骤，编译成字节码，用类的加载器进行加载，分配内存，引擎执行，而内存的如何分配，是我们平时对程序进行调优的主要对象。 </div> </a> <div class="newsitem-meta"> <span class=" votes-operation"> <span class="wrap"> <i class="glyphicon glyphicon-thumbs-up hot"></i> </span> <span class="author pr20"> 天天爆零<span class="dot">·</span>2024-09-07 01:29 </span> </span> <ul class="taglist--inline inline-block articletitle--tag"> <li class="tagPopup mb5"> <a class="tag" href="/search/java/1.htm"> java </a> </li> </ul> </div> </div> </div> <div class="news-item streamitem clearfix mt15"> <div class="news__item-info clearfix"> <a href="/article/1832102704772640768.htm" ></a> <a target="_blank" href="/article/1832102704772640768.htm"> <div class="mb5 mt5"> <h4 class="news__item-title mt0">docker 启动 ElasticSearch</h4> </div> <div class="article-excerpt"> dockerrun--nameelasticsearch-p9200:9200-p9300:9300-e"discovery.type=single-node"-eES_<em>JAVA</em>_OPTS="-Xms64m-Xmx128m </div> </a> <div class="news__item-meta"> <span class=" 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