Here are a few websites that senior Java developers visit most often. These sites provide news, answers to general or interview questions, great lectures, and more. Quality is a key factor for a good website, and this website has high-quality content. The following are introduced one by one:
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 programming language often relies on code samples, stackoverflow has a lot of code snippets. Another good thing about stackoverflow is that it is social. You can look at questions under certain tags like "java" and "regex" and you can see what questions are the most frequently asked and upvoted. This can be a good resource for learning and for writing Java blogging hot topics. Website URL: http://stackoverflow.com/ 2. DZone DZone is an interesting site, many developers share their blog posts. The categories are average, so you may not know what to read next on this site. Website URL: http://www.dzone.com 3. LeetCode If the interview question is java, like "what does an array in memory look like in Java", you can get the answer from many Java tutorials. However, if the question is something like "How to convert a sorted array to a balanced tree", this can be found from LeetCode. leetcode is a social platform for preparing IT technical interviews and contains a series of algorithm related questions. You can check that your code is correct by providing data of different sizes. To be successful in a technical interview, they think it's mainly about repeating these three important steps: code → read → discuss. Website URL: http://leetcode.com/ 4. Java SE Technical Documentation
This website contains all the documentation you will need to use Java SE's APIs. Even advanced Java developers are sure you will find something useful here. For example, you can read some tutorials on "Basic Java Classes", "Deployment", etc.
Website URL: http://docs.oracle.com/javase/ 5. Github You can host your projects for free on Github, but you may not know that it is an excellent resource for learning popular Java libraries and frameworks. For example, if you want to learn the Spring MVC framework, you can search and find some open source projects. Frameworks can be learned quickly by example, especially if you already have some experience with similar frameworks. Website URL: https://github.com/ 6. Coursera This is the best website for video learning. Many good computer science programs can be found from well-known professors at top schools. Some of them are even inventors in the field of computer science. Website URL: https://www.coursera.org/ 7. Java World This website contains a lot of Java tutorials on various topics. Many articles are well written and have illustrated pictures/graphics. It can be used as a deep learning book. Website URL: http://www.javaworld.com/