Eclipse editors allow you to place a book mark on any line within the editor. You can use bookmarks to serve as reminders and quickly navigate to any line in a file.
To set a bookmark, right-click on the vertical ruler near the line on which you want the bookmark and select
Add Bookmark. In the Add Bookmark dialog box enter a name for the Bookmark.
A bookmark icon appears in the vertical ruler. Also, a row is added to the table in the Bookmarks view.
To open the Bookmarks view −
The Bookmarks view shows bookmarks placed in resources across the workspace.
Using the Bookmarks view you can navigate to a bookmark by double clicking on a bookmark or right clicking on a bookmark and selecting "Go to" menu item.