Creating a Copy of a Collection
These examples create a shallow copy of a collection. That is, the
new collection contains references to same objects as the source
collection; the objects are not cloned.
List stuff = Arrays.asList(new String[]{"a", "b"});
// Make a copy of a list
List list = new ArrayList(stuff);
List list2 = new LinkedList(list);
// Make a copy of a set
Set set = new HashSet(stuff);
Set set2 = new TreeSet(set);
// Make a copy of a map
Map map = new HashMap();
// Add key/value pairs ...
Map map2 = new TreeMap(map);
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