Preface
Below are some good websites that I have summarized. You can save them and take a look. I hope they are helpful to you.
1. Introductory Tutorials
It is mainly a tutorial website, mainly a reference for novices to learn and related knowledge.
1, Chocolate Course(https://www.runoob.com )
2. Java study notes (https://mrjokersince1997.github.io/My-Notes/#/)
3、W3Cschool（https://www.w3cschool.cn/java/）
Second,Technology reviewClass
They are mainly technical forums, not only Java, but also technology-related articles. If you encounter problems or want to know information about related technologies, you can browse these websites.
1、CSDN（https://www.csdn.net）
2、 OSCHINA（https://www.oschina.ne）
3, 51CTOHogu(https://blog.51cto.com )
4,depth expansion source(https://www.open-open.com a>)
5,Simplification(https://www.jianshu.com )
6、segmentfault（https://segmentfault.com）
三、线编程类
Online programming websites may not be used on a daily basis, but they are convenient and can be saved for emergencies.
1,Saicho tools(https://c.runoob.com/compile/10 /)
2、http://Json.cn(https://www.json.cn/runcode/run_java/)
3、ideone(https://ideone.com)
4、tool(https://tool.lu/coderunner/)
5、compilejava(https://www.compilejava.net)
6、JSrun(http://java.jsrun.net/)
7、JDoodle(https://www.jdoodle.com/online-java-compiler/)
4. Project warehouse category
mainly Project Management ’s warehouse. If you need to find the corresponding project exercises, you can also search there.
1、github（https://github.com）
2、gitee（https://gitee.com/explore）
5. Interview questions
Interview Browse the question types. There is a question bank and interview-related materials. You can save them if needed~
1, 牛客网（https://www.nowcoder.com)
2、Leet力扣（https://leetcode-cn.com）
3、LintCode炼码（https://www.lintcode.com/）
4、赛码（https://www.acmcoder.com/#/practice/company）
5、CodeChef（https://www.codechef.com）
6、hihocoder（http://hihocoder.com/problemset）
Continuously updating~