Until java 7 you had to write: List<String> list = new ArrayList<String>(); It feels silly to have to write the type parameter twice. But now you can say:

Until java 7 you had to write: List<String> list = new ArrayList<String>(); It feels silly to have to write the type parameter twice. But now you can say: List<String> list = new ArrayList<>(); It's usually not a huge deal, but occasionally the stutter can be more pronounced: Map<String, List<Map<Integer, Set<Float>>>> map = ...