* Copyright (C) 2007 The Guava Authors
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
for other immutable types.
intern(a).equals(a)always holds, and
intern(a) == intern(b)if and only if
a.equals(b). Note that
intern(a)is permitted to return one instance now and a different instance later if the original interned instance was garbage-collected.
Warning: do not use with mutable objects.