* Added some more resources (all free) to the list * Updated the index.md and removed a few links Specifically removed the Java2s book link, and the Java Freeware link. Also changed the link for the Helsinki MOOC to https.
		
			
				
	
	
	
		
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Resources
Java is trademarked and licensed by Oracle. Most of the following are un-official resources, unless hosted by Oracle.
Tutorials
- Oracle Official Java Tutorial
 - Think Java
 - Jenkov's Java Tutorials
 - Mkyong's Java & Spring Tutorials
 - Vogella's Java Tutorials
 - Java 8 Tutorial
 - Better Java
 - Java Programming notes by NTU
 - HackerRank's 30 days of Code Challenge with video tutorials in Java<
 - Princeton's Introduction to Programming in Java
 - The University of Helsinki's MOOC on Programming in Java (Part 1)
 - Introduction to Programming Using Java
 - Java Practices
 - Java Design Patterns
 - Algorithms in Java
 - Spring Official Guides
 - TutorialsPoint - Java
 - Java for Small Teams
 - Cave of Programming's Java Course
 
Challenges
- /r/dailyprogrammer
 - Java Koans
 - Coding Bat Java Challenges
 - Excercism Java Challenges
 - Project Euler
 - Practice It! - Java Challenges
 - Codewars - Java Katas
 - HackerRank Java Challenges
 - LeetCode
 - CodeAbbey
 
Community
- Oracle Java Community
 - Awesome Java
 - /r/Java
 - /r/LearnJava
 - /r/javahelp
 - /r/javaexamples
 - Java Ranch
 - Java Code Geeks
 - Java 8 API Search