Is there a way to have multiple character's saves on the same map with only one account?

Is there a way to have more then 1 character saved on my map while using only one account?
I only have 1 account but there are 3 of us. We want to alternate playing, but with everyone playing on the same map and having their own stuff (position, inventory, ender chest, mod stuff, etc.).
This is just single player, no server and their will be no more then 1 player playing at a time.
the first answer do not work. I still got all my stuff. I did not start like a new guy and it just seems to reset my mod so now. I lost my progress :( good thing I was not fare lol
Best Answer
There are several files and folders that have to be copied:
- level.dat
- playerdata/
- stats/
If you want to create a user you copy those files to a safe location.
If you want to switch users you first have to copy these files to the specific directory and replace them with the files from the folder for the new player.
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Answer 2
You may be able to swap out the .dat file located in .\minecraft\world\players for each user. BACK UP YOUR WORLD before you attempt this. The basic solution would be to move your .dat file into a different location after you close the game and move in the other player's backed up file before they start. From the server's perspective the player would revert to a previous condition.
This link may be useful when messing with the players folder. http://minecraft.gamepedia.com/Server#Reset_player
To set this up... Start a new world Player 1: Login and play Save and quit Rename the player .dat file to include your name Player 2: (same as player 1) Player 3: (same as above)
THEN to switch users...
Player 1: Rename your .dat file to the original name. Login and Play Save and Quit Rename the player .dat file to include your name ...
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