Java collection/map apply method equivalent?

Question

I would like to apply a function to a Java collection, in this particular case a map. Is there a nice way to do this? I have a map and would like to just run trim() on all t

Answer 1

Might be overkill for something like this, but there are a number of really good utilities for these types of problems in the Apache Commons Collections library.

Map map = new HashMap(); 
map.put("key1", "a  ");
map.put("key2", " b ");
map.put("key3", "  c");

TransformedMap.decorateTransform(map, 
  TransformerUtils.nopTransformer(), 
  TransformerUtils.invokerTransformer("trim"));

I highly recommend the Jakarta Commons Cookbook from O'Reilly.