--- /dev/null	2016-11-07 10:57:11.188000000 +0530
+++ new/test/java/util/Locale/Bug8166994.java	2016-11-07 12:57:33.999268904 +0530
@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+/*
+ * @test
+ * @bug 8166884
+ * @summary Checks the subsequent call to parse the same language ranges
+ *          which must generate the same list of language ranges
+ *          i.e. the priority list containing equivalents, as in the
+ *          first call
+ */
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Locale;
+import java.util.stream.Collectors;
+
+public class Bug8166994 {
+
+    public static void main(String[] args) {
+        List<String> list = Arrays.asList("ccq-aa", "ybd-aa", "rki-aa");
+        String ranges = "ccq-aa";
+        testParseConsistency(list, ranges);
+
+        // consecutive call to check the language range parse consistency
+        testParseConsistency(list, ranges);
+
+        // another case with ranges consisting of multiple equivalents and
+        // single equivalents
+        list = Arrays.asList("gfx-xz", "oun-xz", "mwj-xz", "vaj-xz",
+                "taj-xy", "tsf-xy");
+        ranges = "gfx-xz, taj-xy";
+        testParseConsistency(list, ranges);
+        // consecutive call to check the language range parse consistency
+        testParseConsistency(list, ranges);
+
+    }
+
+    private static void testParseConsistency(List<String> list, String ranges) {
+        List<String> priorityList = parseRanges(ranges);
+        if (!list.equals(priorityList)) {
+            throw new RuntimeException("Failed to parse the language range ["
+                    + ranges + "], Expected: " + list + " Found: "
+                    + priorityList);
+        }
+    }
+
+    private static List<String> parseRanges(String s) {
+        return Locale.LanguageRange.parse(s).stream()
+                .map(Locale.LanguageRange::getRange)
+                .collect(Collectors.toList());
+    }
+
+}
+