How do you build a wall mounted kitchen cabinet shelf?

Question:We had plumbing work done and they had to cut into wall an they had to remove that shelf and I want to know how can I put up another its wall mounted as well...SERIOUS ANSWERS TY.

Answers:
i'm assuming you have a cabnet, if not build one regularly. attach a 2x4 accross the top and half way down on the back, running just a bit less than the length of the cabinet. hang some other 2x4s on the wall so the the cabinet with its 2x4s will hang on those and secure it through the 2x4s, you'll need a bit of trim to go around it or just remember when building the cabinet to give some overhang on the sides and bottom. don't forget to mark your studs...