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  • It's worth mentioning that you can define methods on the interface and as long as you implement them there you don't have to implement them at every implementor (at least in Java 8). Commented Nov 12, 2014 at 19:29
  • @BenjaminGruenbaum In fact, Java only supports that from Java 8 onwards and it has some limitations. For example, you are very limited in what the default implementation can access. Commented Nov 13, 2014 at 1:16