The project explorer sometimes disappears if you double tap on the bar at the top with all your tabs. If you double tap on the bar with your tabs again, it should open.
If this doesn't work go to Window > Show View > Project Explorer. This will open up the Project Explorer with your files, and if you are missing a Console, etc. you can use this method as well. If all else fails, Window > Perspective > Reset Perspective .
Hope that helped!
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