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lots of exercises in java... from https://github.com/exercism/java
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JavaExercism/exercises/hamming/.meta/hints.md

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Hints

This is the first exercise with tests that require you to throw an Exception. Exceptions are typically thrown to indicate that a program has encountered an unexpected input or state.

We use JUnit's ExpectedException rule throughout the track to verify that the exceptions you throw are:

  1. instances of a specified Java type;
  2. (optionally) initialized with a specified message.