When comparing JavaString vs Hackr.io, the Slant community recommends Hackr.io for most people. In the question“What are the best online resources for learning Java?” Hackr.io is ranked 5th while JavaString is ranked 7th. The most important reason people chose Hackr.io is:
Instead of getting a recommendation from a single dev, you get recommendation from the entire programming community.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Covers variety of topics
Covers everything from modifiers to object oriented programming.
Pro Community trust
Instead of getting a recommendation from a single dev, you get recommendation from the entire programming community.
Pro Recommendation for every programming language/framework/library
You can find Python as well as Jenkins.
Pro Nice filters
Free, Video, Book, Beginner, Advanced, etc.
Cons
Con Only touches on concepts
JavaString does a good job of introducing concepts in a straight forward way. However there is no actually projects to demonstrate the code, no interactive components, and the descriptions can be a bit bare bones. JavaString alone won't be enough to teach you concepts, only introduce them so you know what to learn.