Need help to a Minecraft/ java execute program

Question

Hey.

I need some help to make a program that does nearly the same as the search bar (or whatever its called) you have in the bottom left corner of your screen if you press "start" 

This is the "code" that i have to copy and paste in the search bar: java -Xms512m -Xmx1024m -cp "%APPDATA%\.minecraft\bin\*" -Djava.library.path="%APPDATA%\.minecraft\bin atives" net.minecraft.client.Minecraft "NAME OF PLAYER GOES HERE"

And every time i want to log in as another player i have to type in the minecraft account name where it says i need to, so i want to know/ learn how to make a program that does so that i just have to type in the name i want to log in as and then it "executes" the file that normally comes up when you search that.

If you kinda know what i want i'd like to make then please help me :)