I'm in edit space of Eclipse (in some java class)
So, how to focus(to switch) view(Navigator or Explorer) by keyboard?
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Sign up to join this communityVia the menus: Window > Preferences, then General -> Keys
(or just Ctrl-Shift-L twice)
Then you can search in the type filter text
field for "view: navigator" or target id: navigator
If there's not a key binding already, you can add one in the Binding: text field below.
To navigate to the Java Package Explorer specifically use the key binding Alt+Shift+Q P.
The key bindings to focus certain views in Eclipse all follow the pattern Alt+Shift+Q <Letter> though not all views have a key binding of their own.
As an alternative there is the Show In menu. The key binding Alt+ShiftW opens a popup menu that lists all views in which the current selection/editor can be shown in. Navigation views like Package Explorer and Project Explorer are always among the choices.