One of Eclipse’s perspectives was rearranged, and too many views were closed. How do you restore the perspective to its original condition?

If a perspective becomes scrambled to the point of being unrecognizable, you can restore it to its original state by selecting Window→ Reset Perspective.

Eclipse always keeps numerous backups and restore points in its memory. In addition to those platform- and file-specific backups, Eclipse also has default starting points for the windows and perspectives of editors and other components. Reset Perspective gives you that behavior with just a mouse-click and is helpful when things become cluttered and confused.