The answer from Csaba_H is right : there is no keyboard shortcut to switch from one editor area to the next. The most you can do through keyboard shortcuts is to switch to “another editor”, whatever its area is (left, right, top, bottom… whatever you tiled the area into :p) through the usual shortcuts :
- next editor : ctrl + F6
- previous editor : ctrl + shift + F6
- quick switch editor : ctrl + E
I’ll only mention that you can also take a look yourself to all available shortcuts in your Eclipse if you go to Window > preferences and go into the section General > Keys (a shortcut to get there is to use ctrl + shift + L twice).