--- a/src/java.base/share/classes/sun/util/locale/UnicodeLocaleExtension.java	Thu Dec 13 16:14:07 2018 +0100
+++ b/src/java.base/share/classes/sun/util/locale/UnicodeLocaleExtension.java	Thu Dec 13 15:31:05 2018 +0100
@@ -80,7 +80,7 @@
                 String value = keyword.getValue();
 
                 sj.add(key);
-                if (value.length() > 0) {
+                if (!value.isEmpty()) {
                     sj.add(value);
                 }
             }