8026766: Add toString() to j.u.Locale.LanguageRange

Reviewed-by: okutsu

jdk/src/java.base/share/classes/java/util/Locale.java

@@ -3144,6 +3144,18 @@ public final class Locale implements Cloneable, Serializable {
                    && range.equals(other.range)
                    && weight == other.weight;
         }
+
+        /**
+         * Returns an informative string representation of this {@code LanguageRange}
+         * object, consisting of language range and weight if the range is
+         * weighted and the weight is less than the max weight.
+         *
+         * @return a string representation of this {@code LanguageRange} object.
+         */
+        @Override
+        public String toString() {
+            return (weight == MAX_WEIGHT) ? range : range + ";q=" + weight;
+        }
     }
 
     /**

jdk/test/java/util/Locale/Bug8026766.java

@@ -0,0 +1,45 @@
+/*
+ * 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 8026766
+ * @summary Confirm that LanguageRange.toString() returns an expected result.
+ * @run main Bug8026766
+ */
+
+import java.util.Locale.LanguageRange;
+
+public class Bug8026766 {
+
+    public static void main(String[] args) {
+        LanguageRange lr1 = new LanguageRange("ja", 1.0);
+        LanguageRange lr2 = new LanguageRange("fr", 0.0);
+
+        if (!lr1.toString().equals("ja") ||
+            !lr2.toString().equals("fr;q=0.0")) {
+            throw new RuntimeException("LanguageRange.toString() returned an unexpected result.");
+        }
+    }
+
+}