--- old/src/jdk.javadoc/share/classes/com/sun/tools/javadoc/main/ClassDocImpl.java	2018-12-06 17:53:46.697645544 -0500
+++ new/src/jdk.javadoc/share/classes/com/sun/tools/javadoc/main/ClassDocImpl.java	2018-12-06 17:53:46.525644692 -0500
@@ -420,7 +420,7 @@
         } else {
             String n = "";
             for ( ; c != null; c = c.owner.enclClass()) {
-                n = c.name + (n.equals("") ? "" : ".") + n;
+                n = c.name + (n.isEmpty() ? "" : ".") + n;
             }
             return n;
         }