How to avoid applied lazily Lists.transform in guava?

Question

Map map = Maps.newHashMap();
map.put(\"test\",\"123\");
map.put(\"fuyou001\",\"456\");
map.put(\"id\",1         


        

Answer 1

To complement Louis' answer, you're using Lists.transform() as if it modified the original list, like Collections.sort(). It doesn't.

You have to use the return value of Lists.transform() to see something happen, keeping in mind that it's a view which gets evaluated each and every time you call it. So if you need to use the result several times, as Louis said, do a copy in a new List (ArrayList, ImmutableList, etc.).