modules/javafx.controls/src/main/java/javafx/scene/control/FocusModel.java

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      /**
       * Returns the number of items in the data model that underpins the control.
       * An example would be that a ListView focus model would likely return
       * <code>listView.getItems().size()</code>. The valid range of focusable
       * indices is between 0 and whatever is returned by this method.
+      * @return the number of items in the data model that underpins the control
       */
      protected abstract int getItemCount();
  
      /**
       * Returns the item at the given index. An example using ListView would be
*** 132,142 ****
  
      /**
       * Causes the item at the given index to receive the focus. This does not
       * cause the current selection to change. Updates the focusedItem and
       * focusedIndex properties such that <code>focusedIndex = -1</code> unless
!      * <code>0 <= index < model size</code>.
       *
       * @param index The index of the item to get focus.
       */
      public void focus(int index) {
          if (index < 0 || index >= getItemCount()) {
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      /**
       * Causes the item at the given index to receive the focus. This does not
       * cause the current selection to change. Updates the focusedItem and
       * focusedIndex properties such that <code>focusedIndex = -1</code> unless
!      * <code>0 &lt;= index &lt; model size</code>.
       *
       * @param index The index of the item to get focus.
       */
      public void focus(int index) {
          if (index < 0 || index >= getItemCount()) {