src/java.base/share/classes/sun/reflect/generics/reflectiveObjects/ParameterizedTypeImpl.java

@@ -210,19 +210,19 @@
             if (ownerType instanceof Class)
                 sb.append(((Class)ownerType).getName());
             else
                 sb.append(ownerType.toString());
 
-            sb.append(".");
+            sb.append("$");
 
             if (ownerType instanceof ParameterizedTypeImpl) {
                 // Find simple name of nested type by removing the
                 // shared prefix with owner.
                 sb.append(rawType.getName().replace( ((ParameterizedTypeImpl)ownerType).rawType.getName() + "$",
                                          ""));
             } else
-                sb.append(rawType.getName());
+               sb.append(rawType.getSimpleName());
         } else
             sb.append(rawType.getName());
 
         if (actualTypeArguments != null &&
             actualTypeArguments.length > 0) {