initializing static final Collection/Map in one statement

Initializing a static final (unmodifiable) Map:

private final static Map<String,String> map = Collections.unmodifiableMap(new HashMap<String,String>() {
 {
  put("key1", "value1");
  put("key2", "value2");
 }
});

Initializing a static final (unmodifiable) Collection:

private final static Set<String> set = Collections.unmodifiableSet(new HashSet<String>() {
  {
   add("value1");
   add("value2");
  }
 });