How do I sort a Set to a List in Java?
The answer provided by the OP is not the best. It is inefficient, as it creates a new List and an unnecessary new array. Also, it raises "unchecked" warnings because of the type safety issues around generic arrays.
Instead, use something like this:
public static<T extends Comparable<? super T>> List<T> asSortedList(Collection<T> c) { List<T> list = new ArrayList<T>(c); java.util.Collections.sort(list); return list;}Here's a usage example:
Map<Integer, String> map = new HashMap<Integer, String>();/* Add entries to the map. */.../* Now get a sorted list of the *values* in the map. */Collection<String> unsorted = map.values();List<String> sorted = Util.asSortedList(unsorted);
Sorted set:
return new TreeSet(setIWantSorted);or:
return new ArrayList(new TreeSet(setIWantSorted));
List myList = new ArrayList(collection);Collections.sort(myList);… should do the trick however. Add flavour with Generics where applicable.