return (T) x;
return new IdentityHashMap<K, V>();
return new LinkedHashMap<K, V>();
return new ArrayList<E>();
return new ArrayList<E>(c);
return new HashMap<K, V>();
return new HashSet<E>();
return new HashSet<E>(c);
return new TreeMap<K, V>();
return new TreeMap<K, V>(comp);
Map<K, V> map = newIdentityHashMap(); return Collections.synchronizedMap(map);
return Collections.synchronizedMap(Util.<K, V>newMap());