--- a/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/PackageTreeWriter.java	Mon Mar 11 11:23:09 2019 -0700
+++ b/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/PackageTreeWriter.java	Mon Mar 11 12:59:45 2019 -0700
@@ -106,20 +106,20 @@
         if (configuration.packages.size() > 1) {
             addLinkToMainTree(div);
         }
-        mainTree.addContent(div);
+        mainTree.add(div);
         HtmlTree divTree = new HtmlTree(HtmlTag.DIV);
         divTree.setStyle(HtmlStyle.contentContainer);
         addTree(classtree.baseClasses(), "doclet.Class_Hierarchy", divTree);
         addTree(classtree.baseInterfaces(), "doclet.Interface_Hierarchy", divTree);
         addTree(classtree.baseAnnotationTypes(), "doclet.Annotation_Type_Hierarchy", divTree);
         addTree(classtree.baseEnums(), "doclet.Enum_Hierarchy", divTree, true);
-        mainTree.addContent(divTree);
-        body.addContent(mainTree);
+        mainTree.add(divTree);
+        body.add(mainTree);
         HtmlTree footer = HtmlTree.FOOTER();
         navBar.setUserFooter(getUserHeaderFooter(false));
-        footer.addContent(navBar.getContent(false));
+        footer.add(navBar.getContent(false));
         addBottom(footer);
-        body.addContent(footer);
+        body.add(footer);
         printHtmlDocument(null, getDescription("tree", packageElement), body);
     }
 
@@ -138,8 +138,8 @@
                 contents.moduleLabel);
         navBar.setNavLinkModule(linkContent);
         navBar.setUserHeader(getUserHeaderFooter(true));
-        htmlTree.addContent(navBar.getContent(true));
-        bodyTree.addContent(htmlTree);
+        htmlTree.add(navBar.getContent(true));
+        bodyTree.add(htmlTree);
         return bodyTree;
     }
 
@@ -151,10 +151,10 @@
     protected void addLinkToMainTree(Content div) {
         Content span = HtmlTree.SPAN(HtmlStyle.packageHierarchyLabel,
                 contents.packageHierarchies);
-        div.addContent(span);
+        div.add(span);
         HtmlTree ul = new HtmlTree (HtmlTag.UL);
         ul.setStyle(HtmlStyle.horizontal);
-        ul.addContent(getNavLinkMainTree(resources.getText("doclet.All_Packages")));
-        div.addContent(ul);
+        ul.add(getNavLinkMainTree(resources.getText("doclet.All_Packages")));
+        div.add(ul);
     }
 }