DZone refcardz

Refcard #200

Getting Java apps to run is one thing. But getting them to run fast is another. Performance is a tricky beast in any object-oriented environment, but the complexity of the JVM adds a whole new level of performance-tweaking trickiness -- and opportunity. This Refcard covers JVM internals, class loading (updated to reflect the new Metaspace in Java 8), garbage collection, troubleshooting, monitoring, concurrency, and more.

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Refcard #232

R is a highly extensible, open-source programming language used mainly for statistical analysis and graphics. R has become a widely popular language because of its varying data structures, which can be more intuitive than data storage in other languages; its built-in statistical and graphical functions; and its large collection of useful plugins that can enhance the language’s abilities in many different ways.

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