zz from stackoverflow - effecient tip: how switch tabs in Eclipse

you may want to switch from two files constantly, maybe one minute before you are editing a file and a minute later you want to modify the file that has been affected by the change one minute ago. 

Here the shortcut will favor Windows Users, but you can expand the short-cut to Mac as well. 

• CTRL+E (for a list of editor)
• CTRL+F6 (for switching to the next editor through a list)
  You can assign another shortcut to the 'Next Editor' key.

are the two official shortcuts, but they both involve a list being displayed.

CTRL+Page Up / CTRL+Page Down can cycle through editors without displaying a list.

What is interesting with that last set of shortcuts is:
they are not listed in the Eclipse Keys shortcuts to be defined.
They may be inherited from the multipage editor, making them an OS specific shortcut.

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Regarding shortcuts on Max Os, MДΓΓ БДLL complained in Sept. 2011 to not being able to remap CTRL+Page Up/CTRL+Page Down:

It drives me nuts to not be able to flip through open tabs as I can in pretty much every other tabbed program in OS X (⌘-Left and ⌘-Right).

Well, in March 2012, Arthur replied:

, I've just downloaded the latest version of Eclipse (3.7+). I've been able to bind "Previous/Next tab" to (⌘-Left and ⌘-Right) when in Editor, which I'm pretty sure I couldn't do before.
So I guess they heard you.
It works just as you expect, tabs going from left to right and vice-versa, not on a history basis or some nonsense like that.

MДΓΓ БДLL confirms:

oh wow, selecting "Editing Java Source" actually worked!
Now, unfortunately this means that I'm SOL if I nav into a non-Java file (JSP, XML, JS, etc.).
The fix for this is to "copy command" for this pair, and select all the "whens" that I want.
So far it's at least working beautifully for Java and JSP files.
This is a major PITA to set up, but it's just a one-time thing.

His exported preferences are available here for you to try.
Once imported, you should see, for all the relevant types of document:

A Side note on the shortcut, you can as well use the following reply.

On OSX, replace CTRL with CMD for the first two keyboard actions. But you will still need to use CTRL with PgUp or PgDown to cycle through editors. Another set of useful KB shortcuts I just found while trying out some of the suggestions below: you can use ALT+Up or ALT+Down to move an entire line of code.