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Tech

Java: Type safe MessageDigest

The standard Java class MessageDigest can be used to return instances for various message digest algorithms. Implementing a simple factory helps you to return these instances in a type safe way without magic strings and preventing catch blocks with NoSuchAlgorithmException in your code.

Steinhaus–Johnson–Trotter implementation in Java

Generally it’s frustrating to read that somebody implemented the Steinhaus–Johnson–Trotter algorithm to generate permutations but doesn’t supply the source code due to the fear that the code could be “copied elsewhere” on the internet. Since I was really interested in permutations for another project I implemented the said algorithm, added a LGPL license to it …

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