How to convert a Collection to List?
List list = new ArrayList(coll);Collections.sort(list);As Erel Segal Halevi says below, if coll is already a list, you can skip step one. But that would depend on the internals of TreeBidiMap.
List list;if (coll instanceof List) list = (List)coll;else list = new ArrayList(coll);
Something like this should work, calling the ArrayList constructor that takes a Collection:
List theList = new ArrayList(coll);
I think Paul Tomblin's answer may be wasteful in case coll is already a list, because it will create a new list and copy all elements. If coll contains many elemeents, this may take a long time.
My suggestion is:
List list;if (coll instanceof List) list = (List)coll;else list = new ArrayList(coll);Collections.sort(list);