With Java9 we finally get an easy way to construct collections. I think the map is one that I will be using quite often. Now I can write: Map<String,String> lookupMap = Map.ofEntries( entry(“a”, “A”), entry(“b”, “B”), entry(“c”, “C”)); Instead of: Map<String, String> lookupMap = new HashMap<>(); lookupMap.put(“a”,”A”); lookupMap.put(“b”,”B”); lookupMap.put(“c”,”C”);