Websites for Advanced Level Java Developers

1. Stackoverflow
Stackoverflow.com is probably the most popular website in the programming world. There are millions of good questions and answers. Learning an API or a programming language often rely on code examples, stackoverflow has a lot of code segments.
Another good thing about stackoverflow is that it is social. You can view questions under some certain tags, e.g. “java” and “regex”, then you can see what question is most frequently asked and most voted. This can serve as a good resource for learning, also a good resource to write popular topics of Java bloggers.
stackoverflow
2. DZone
I would say this website is fun, lots of developers share their blog articles. It is like an adventure, you never know what you are going to read next from this site.
dzone
3. LeetCode
If interview question is java specific, like “what array look like in memory in Java”, you can get answers from a lot of Java tutorials. However, if the question is something like “how to convert an sorted array to a balanced tree”, then leetcode is the right place to go. It is a social platform for preparing IT technical interviews and contains a collection of algorithm related questions. The best part is that it also has an online judge which can check if your code is correct or not by feeding different size of data. To be successful in a technical interview, they believe it is mainly repeating these three important steps: code → read → discuss.
leetcode
4. Java SE Technical Documentation
This website contains all documents you will need to use API of Java SE. Even if you are an advanced level Java developer, I’m pretty sure that you will find something useful and official here. For example, you can read some tutorials of “Essential Java Classes”, “Deployment”, etc.
oracle-doc
5. Github
You probably know that you can host your projects for free there, but you may not know it is an excellent resource for learning popular Java libraries and frameworks. For instance, if you want to learn Spring MVC framework, you can search and find some open source projects. As the “monkey see monkey do” rule works for learning frameworks, you will be able to learn the frameworks quickly by examples, especially if you already have some experience with similar frameworks.
github
6. Coursera
This is the best site for video lectures. You can find a lot of good computer science courses from famous professors of top schools. Some of them are even the inventor of some computer science areas.
courseera
7. Java World
This site contains a large collection of Java tutorials on various kinds of topics. A lot of articles are well written and has pictures/diagram for illustrations. It can be used as a book for deep learning.
javaworld
8. IBM developerWorks
It has a lot of nice articles wrtten by IBM people.
ibm
9. Wikipedia
This is one of the best resources for looking up and learning almost any concepts. For example, as an experienced Java developer you may just want to know some concept, but not learn much. This is a great place to find updated information for free. For example, what is service-oriented programming. It can also serve as a huge collection of clues and ideas for your writing. For example, the same word may stand for totally different concepts in different areas. Sometimes it is interesting to know the concept in other areas.
wiki

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