On the regular base I switch between tabs with the Keyboard shortcut <Ctrl>-<TAB>,
which opens a small window like display where you can navigate.
But if there are a lot of files open, this is tedious. In Eclipse there is a selection mode, where you can
narrow down the list of files by type the name letters.
In Netbeans this is possible with <SHIFT>-<F4>, which opens the menu Window->Documents.
Here you can search by typing to the document.