How do you zip a Java file in Minecraft?

How do you zip a Java file in Minecraft?
Alternate Instructions

Download the world file (usually in .zip or .rar ) format.
Extract to a new folder (WORLD)
Find the .minecraft or com.mojang folder.
Look for the saves or minecraftWorlds folder.
Copy-paste the (WORLD) to that folder.
Open up Minecraft and find it in your selection of saved worlds.

Alternate Instructions
  1. Download the world file (usually in .zip or .rar ) format.
  2. Extract to a new folder (WORLD)
  3. Find the .minecraft or com.mojang folder.
  4. Look for the saves or minecraftWorlds folder.
  5. Copy-paste the (WORLD) to that folder.
  6. Open up Minecraft and find it in your selection of saved worlds.