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Java / Guides / Outline tree

Navigate PDF outline tree in Java

To navigate an outline tree and print its result.

void PrintIndent(Bookmark item) throws PDFNetException {
  int ident = item.getIndent() - 1;
  for (int i = 0; i < ident; ++i) {
    System.out.print("  ");
void PrintOutlineTree(Bookmark item) throws PDFNetException {
  for (; item.isValid(); item = item.getNext()) {
    System.out.print((item.isOpen() ? "- " : "+ ") + item.getTitle() + " ACTION -> ");
    if (item.hasChildren()) {
PDFDoc doc = new PDFDoc(filename);
Bookmark root = doc.getFirstBookmark();

Read, add, edit PDF outlines and bookmarks
Full code sample which illustrates how to read and edit existing outline items and create new bookmarks using the high-level API.

About outline tree

A PDF document may display a document outline on the screen, allowing the user to navigate interactively from one part of the document to another. The outline consists of a tree-structured hierarchy of Bookmarks (sometimes called outline items), which serve as a "visual table of contents" to display the document's structure to the user.

Each Bookmark has a title that appears on screen, and an Action that specifies what happens when a user clicks on the Bookmark. The typical Action for a user-created Bookmark is to move to another location in the current document — although any Action can be specified.

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