René's URL Explorer Experiment

Title: JavaGuide/docs/java/basis/java-basic-questions-02.md at main · ddmcc/JavaGuide · GitHub

Open Graph Title: JavaGuide/docs/java/basis/java-basic-questions-02.md at main · ddmcc/JavaGuide

X Title: JavaGuide/docs/java/basis/java-basic-questions-02.md at main · ddmcc/JavaGuide

Description: 「Java学习+面试指南」一份涵盖大部分 Java 程序员所需要掌握的核心知识。准备 Java 面试，首选 JavaGuide！ - JavaGuide/docs/java/basis/java-basic-questions-02.md at main · ddmcc/JavaGuide

Open Graph Description: 「Java学习+面试指南」一份涵盖大部分 Java 程序员所需要掌握的核心知识。准备 Java 面试，首选 JavaGuide！ - ddmcc/JavaGuide

X Description: 「Java学习+面试指南」一份涵盖大部分 Java 程序员所需要掌握的核心知识。准备 Java 面试，首选 JavaGuide！ - ddmcc/JavaGuide

Opengraph URL: https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md

X: @github

direct link

Domain: github.com

route-pattern	/:user_id/:repository/blob/name(/path)
route-controller	blob
route-action	show
fetch-nonce	v2:1ec623aa-6e3b-6f73-2564-f8ea59065546
current-catalog-service-hash	f3abb0cc802f3d7b95fc8762b94bdcb13bf39634c40c357301c4aa1d67a256fb
request-id	A68A:95C7C:4478FE:5C0D57:6A5408E1
html-safe-nonce	bd93f0929852334be4c1a232935182c28d562f4091733f97c0c675cd9ec5a996
visitor-payload	eyJyZWZlcnJlciI6IiIsInJlcXVlc3RfaWQiOiJBNjhBOjk1QzdDOjQ0NzhGRTo1QzBENTc6NkE1NDA4RTEiLCJ2aXNpdG9yX2lkIjoiMjMzMTM2MTczMDk4NTQ2MTk4NSIsInJlZ2lvbl9lZGdlIjoiaWFkIiwicmVnaW9uX3JlbmRlciI6ImlhZCJ9
visitor-hmac	9da2b36c275dbb38cebc08f929b82ea4415d44754c1df9f2dc1d7404f9963e30
hovercard-subject-tag	repository:374105267
github-keyboard-shortcuts	repository,source-code,file-tree,copilot
google-site-verification	Apib7-x98H0j5cPqHWwSMm6dNU4GmODRoqxLiDzdx9I
octolytics-url	https://collector.github.com/github/collect
analytics-location	///blob/show
fb:app_id	1401488693436528
apple-itunes-app	app-id=1477376905, app-argument=https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md
twitter:image	https://opengraph.githubassets.com/a4df132bb796026e88fd4012984d7c703989c5251961671b6bd769434ff4a7f6/ddmcc/JavaGuide
twitter:card	summary_large_image
og:image	https://opengraph.githubassets.com/a4df132bb796026e88fd4012984d7c703989c5251961671b6bd769434ff4a7f6/ddmcc/JavaGuide
og:image:alt	「Java学习+面试指南」一份涵盖大部分 Java 程序员所需要掌握的核心知识。准备 Java 面试，首选 JavaGuide！ - ddmcc/JavaGuide
og:image:width	1200
og:image:height	600
og:site_name	GitHub
og:type	object
hostname	github.com
expected-hostname	github.com
None	b9a586c06a05a7a86fc7e3f4dbd03e42f6869085879aa184aa6369456dbd50fb
turbo-cache-control	no-cache
go-import	github.com/ddmcc/JavaGuide git https://github.com/ddmcc/JavaGuide.git
octolytics-dimension-user_id	26783126
octolytics-dimension-user_login	ddmcc
octolytics-dimension-repository_id	374105267
octolytics-dimension-repository_nwo	ddmcc/JavaGuide
octolytics-dimension-repository_public	true
octolytics-dimension-repository_is_fork	true
octolytics-dimension-repository_parent_id	132464395
octolytics-dimension-repository_parent_nwo	Snailclimb/JavaGuide
octolytics-dimension-repository_network_root_id	132464395
octolytics-dimension-repository_network_root_nwo	Snailclimb/JavaGuide
turbo-body-classes	logged-out env-production page-responsive
disable-turbo	false
browser-stats-url	https://api.github.com/_private/browser/stats
browser-errors-url	https://api.github.com/_private/browser/errors
release	07a982c1d40157c619b364352b704c3ce66bb332
ui-target	full
theme-color	#1e2327
color-scheme	light dark

Links:

Skip to content	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md#start-of-content
	https://github.com/
Sign in	https://github.com/login?return_to=https%3A%2F%2Fgithub.com%2Fddmcc%2FJavaGuide%2Fblob%2Fmain%2Fdocs%2Fjava%2Fbasis%2Fjava-basic-questions-02.md
GitHub CopilotWrite better code with AI	https://github.com/features/copilot
GitHub Copilot appDirect agents from issue to merge	https://github.com/features/ai/github-app
MCP RegistryNewIntegrate external tools	https://github.com/mcp
ActionsAutomate any workflow	https://github.com/features/actions
CodespacesInstant dev environments	https://github.com/features/codespaces
IssuesPlan and track work	https://github.com/features/issues
Code ReviewManage code changes	https://github.com/features/code-review
GitHub Advanced SecurityFind and fix vulnerabilities	https://github.com/security/advanced-security
Code securitySecure your code as you build	https://github.com/security/advanced-security/code-security
Secret protectionStop leaks before they start	https://github.com/security/advanced-security/secret-protection
Why GitHub	https://github.com/why-github
Documentation	https://docs.github.com
Blog	https://github.blog
Changelog	https://github.blog/changelog
Marketplace	https://github.com/marketplace
View all features	https://github.com/features
Enterprises	https://github.com/enterprise
Small and medium teams	https://github.com/team
Startups	https://github.com/enterprise/startups
Nonprofits	https://github.com/solutions/industry/nonprofits
App Modernization	https://github.com/solutions/use-case/app-modernization
DevSecOps	https://github.com/solutions/use-case/devsecops
DevOps	https://github.com/solutions/use-case/devops
CI/CD	https://github.com/solutions/use-case/ci-cd
View all use cases	https://github.com/solutions/use-case
Healthcare	https://github.com/solutions/industry/healthcare
Financial services	https://github.com/solutions/industry/financial-services
Manufacturing	https://github.com/solutions/industry/manufacturing
Government	https://github.com/solutions/industry/government
View all industries	https://github.com/solutions/industry
View all solutions	https://github.com/solutions
AI	https://github.com/resources/articles?topic=ai
Software Development	https://github.com/resources/articles?topic=software-development
DevOps	https://github.com/resources/articles?topic=devops
Security	https://github.com/resources/articles?topic=security
View all topics	https://github.com/resources/articles
Customer stories	https://github.com/customer-stories
Events & webinars	https://github.com/resources/events
Ebooks & reports	https://github.com/resources/whitepapers
Business insights	https://github.com/solutions/executive-insights
GitHub Skills	https://skills.github.com
Documentation	https://docs.github.com
Customer support	https://support.github.com
Community forum	https://github.com/orgs/community/discussions
Trust center	https://github.com/trust-center
Partners	https://github.com/partners
View all resources	https://github.com/resources
GitHub SponsorsFund open source developers	https://github.com/open-source/sponsors
Security Lab	https://securitylab.github.com
Maintainer Community	https://maintainers.github.com
Accelerator	https://github.com/open-source/accelerator
GitHub Stars	https://stars.github.com
Archive Program	https://archiveprogram.github.com
Topics	https://github.com/topics
Trending	https://github.com/trending
Collections	https://github.com/collections
Enterprise platformAI-powered developer platform	https://github.com/enterprise
GitHub Advanced SecurityEnterprise-grade security features	https://github.com/security/advanced-security
Copilot for BusinessEnterprise-grade AI features	https://github.com/features/copilot/copilot-business
Premium SupportEnterprise-grade 24/7 support	https://github.com/enterprise/premium-support
Pricing	https://github.com/pricing
Search syntax tips	https://docs.github.com/search-github/github-code-search/understanding-github-code-search-syntax
documentation	https://docs.github.com/search-github/github-code-search/understanding-github-code-search-syntax
Sign in	https://github.com/login?return_to=https%3A%2F%2Fgithub.com%2Fddmcc%2FJavaGuide%2Fblob%2Fmain%2Fdocs%2Fjava%2Fbasis%2Fjava-basic-questions-02.md
Sign up	https://github.com/signup?ref_cta=Sign+up&ref_loc=header+logged+out&ref_page=%2F%3Cuser-name%3E%2F%3Crepo-name%3E%2Fblob%2Fshow&source=header-repo&source_repo=ddmcc%2FJavaGuide
Reload	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md
Reload	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md
Reload	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md
ddmcc	https://github.com/ddmcc
JavaGuide	https://github.com/ddmcc/JavaGuide
Snailclimb/JavaGuide	https://github.com/Snailclimb/JavaGuide
Notifications	https://github.com/login?return_to=%2Fddmcc%2FJavaGuide
Fork 0	https://github.com/login?return_to=%2Fddmcc%2FJavaGuide
Star 0	https://github.com/login?return_to=%2Fddmcc%2FJavaGuide
Code	https://github.com/ddmcc/JavaGuide/tree/main
Pull requests 0	https://github.com/ddmcc/JavaGuide/pulls
Actions	https://github.com/ddmcc/JavaGuide/actions
Projects	https://github.com/ddmcc/JavaGuide/projects
Security and quality 0	https://github.com/ddmcc/JavaGuide/security
Insights	https://github.com/ddmcc/JavaGuide/pulse
Code	https://github.com/ddmcc/JavaGuide/tree/main
Pull requests	https://github.com/ddmcc/JavaGuide/pulls
Actions	https://github.com/ddmcc/JavaGuide/actions
Projects	https://github.com/ddmcc/JavaGuide/projects
Security and quality	https://github.com/ddmcc/JavaGuide/security
Insights	https://github.com/ddmcc/JavaGuide/pulse
	https://github.com/ddmcc/JavaGuide
JavaGuide	https://github.com/ddmcc/JavaGuide/tree/main
docs	https://github.com/ddmcc/JavaGuide/tree/main/docs
java	https://github.com/ddmcc/JavaGuide/tree/main/docs/java
basis	https://github.com/ddmcc/JavaGuide/tree/main/docs/java/basis
History	https://github.com/ddmcc/JavaGuide/commits/main/docs/java/basis/java-basic-questions-02.md
	https://github.com/ddmcc/JavaGuide/commits/main/docs/java/basis/java-basic-questions-02.md
JavaGuide	https://github.com/ddmcc/JavaGuide/tree/main
docs	https://github.com/ddmcc/JavaGuide/tree/main/docs
java	https://github.com/ddmcc/JavaGuide/tree/main/docs/java
basis	https://github.com/ddmcc/JavaGuide/tree/main/docs/java/basis
Raw	https://github.com/ddmcc/JavaGuide/raw/refs/heads/main/docs/java/basis/java-basic-questions-02.md
	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md#面向对象基础
	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md#面向对象和面向过程的区别
面向过程：面向过程性能比面向对象高？？	https://github.com/Snailclimb/JavaGuide/issues/431
	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md#创建一个对象用什么运算符对象实体与对象引用有何不同
	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md#对象的相等和引用相等的区别
	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md#如果一个类没有声明构造方法该程序能正确执行吗
	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md#构造方法有哪些特点是否可被-override
	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md#面向对象三大特征
	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md#封装
	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md#继承
	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md#多态
	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md#接口和抽象类有什么共同点和区别
	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md#深拷贝和浅拷贝区别了解吗什么是引用拷贝
	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md#浅拷贝
	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md#深拷贝
	https://camo.githubusercontent.com/f43fdb020d66750f273cc61ced7144999a067218fdfe2853125a87b89fd12783/68747470733a2f2f6f73732e6a61766167756964652e636e2f6769746875622f6a61766167756964652f6a6176612f62617369732f7368616c6c6f7726646565702d636f70792e706e67
	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md#object
	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md#object-类的常见方法有哪些
	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md#-和-equals-的区别
	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md#hashcode-有什么用
	https://camo.githubusercontent.com/0cce4c1a66c9af6c4f0c3def39759401c77c339f1f8bb8726a80ecc58847fd3d/68747470733a2f2f6f73732e6a61766167756964652e636e2f6769746875622f6a61766167756964652f6a6176612f62617369732f6a6176612d68617368636f64652d6d6574686f642e706e67
https://hg.openjdk.org/jdk8u/jdk8u/hotspot/file/87ee5ee27509/src/share/vm/runtime/globals.hpp（1127行）	https://hg.openjdk.org/jdk8u/jdk8u/hotspot/file/87ee5ee27509/src/share/vm/runtime/globals.hpp%EF%BC%881127%E8%A1%8C%EF%BC%89
https://hg.openjdk.org/jdk8u/jdk8u/hotspot/file/87ee5ee27509/src/share/vm/runtime/synchronizer.cpp（537行开始）	https://hg.openjdk.org/jdk8u/jdk8u/hotspot/file/87ee5ee27509/src/share/vm/runtime/synchronizer.cpp%EF%BC%88537%E8%A1%8C%E5%BC%80%E5%A7%8B%EF%BC%89
	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md#为什么要有-hashcode
	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md#为什么重写-equals-时必须重写-hashcode-方法
Java hashCode() 和 equals()的若干问题解答	https://www.cnblogs.com/skywang12345/p/3324958.html
	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md#string
	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md#stringstringbufferstringbuilder-的区别
	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md#string-为什么是不可变的
如何理解 String 类型值的不可变？ - 知乎提问	https://www.zhihu.com/question/20618891/answer/114125846
issue 675	https://github.com/Snailclimb/JavaGuide/issues/675
	https://camo.githubusercontent.com/b71951fe5f998e20ebba35e47f866d6360c272dbb54e815382d80d994cb22d30/68747470733a2f2f6f73732e6a61766167756964652e636e2f6769746875622f6a61766167756964652f6a646b392d737472696e672d6c6174696e312e706e67
https://openjdk.java.net/jeps/254	https://openjdk.java.net/jeps/254
	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md#字符串拼接用-还是-stringbuilder
	https://camo.githubusercontent.com/97ec34bf84319541b85526157611d547b1c088ff223f89ea17918bde39f2d8e3/68747470733a2f2f6f73732e6a61766167756964652e636e2f6769746875622f6a61766167756964652f6a6176612f696d6167652d32303232303432323136313633373932392e706e67
	https://camo.githubusercontent.com/9ce61a7f400a0020dbb96373f9ae36a759f74bdff3448efbec07b9de7e9d2987/68747470733a2f2f6f73732e6a61766167756964652e636e2f6769746875622f6a61766167756964652f6a6176612f696d6167652d32303232303432323136313332303832332e706e67
	https://camo.githubusercontent.com/1e36db481740668e7fe9bfbf038672437ef6d31f532b3249cd2ac7f225f85a91/68747470733a2f2f6f73732e6a61766167756964652e636e2f6769746875622f6a61766167756964652f6a6176612f696d6167652d32303232303432323136323332373431352e706e67
JEP 280	https://openjdk.org/jeps/280
StringBuilder？来重温一下字符串拼接吧	https://juejin.cn/post/7182872058743750715
	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md#stringequals-和-objectequals-有何区别
	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md#字符串常量池的作用了解吗
Java 内存区域详解	https://javaguide.cn/java/jvm/memory-area.html
	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md#string-s1--new-stringabc这句话创建了几个字符串对象
	https://camo.githubusercontent.com/09724b87f80af4e53219e5f1e9251680ee31d81fd81de55210f60da4fec3c495/68747470733a2f2f6f73732e6a61766167756964652e636e2f6769746875622f6a61766167756964652f6f70656e2d736f757263652d70726f6a6563742f696d6167652d32303232303431333137353830393935392e706e67
	https://camo.githubusercontent.com/7f4d7278964f970e5b769318a4fb3928e2b91f7e4ab1cabdf5dcb448255c40fa/68747470733a2f2f6f73732e6a61766167756964652e636e2f6769746875622f6a61766167756964652f6f70656e2d736f757263652d70726f6a6563742f696d6167652d32303232303431333138303032313037322e706e67
	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md#stringintern-方法有什么作用
	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md#string-类型的变量和常量做运算时发生了什么
	https://camo.githubusercontent.com/86142f2478141a105097ca5d090421327700022f2281e61a54a0e16d7185b793/68747470733a2f2f6f73732e6a61766167756964652e636e2f6a6176612d67756964652d626c6f672f696d6167652d32303231303831373132333235323434312e706e67
	https://camo.githubusercontent.com/c1ae0f32889aae0fac056bd9669b4ec3925d11f7582d17d37871e07fad966ae2/68747470733a2f2f6f73732e6a61766167756964652e636e2f6a61766167756964652f696d6167652d32303231303831373134323731353339362e706e67
	https://github.com/ddmcc/JavaGuide/blob/main/docs/java/basis/java-basic-questions-02.md#参考
https://tech.meituan.com/2014/03/06/in-depth-understanding-string-intern.html	https://tech.meituan.com/2014/03/06/in-depth-understanding-string-intern.html
https://www.zhihu.com/question/55976094/answer/147302764	https://www.zhihu.com/question/55976094/answer/147302764
	https://github.com
Terms	https://docs.github.com/site-policy/github-terms/github-terms-of-service
Privacy	https://docs.github.com/site-policy/privacy-policies/github-privacy-statement
Security	https://github.com/security
Status	https://www.githubstatus.com/
Community	https://github.community/
Docs	https://docs.github.com/
Contact	https://support.github.com?tags=dotcom-footer

Viewport: width=device-width

URLs of crawlers that visited me.