Command Arguments

Ok I'm trying to get a little better with commands since all I've done is just basic stuff.

So what I'm trying to do is something like what CoreProtect does, how /co rollback u:USER t:TIME etc.

I understand it's something along the lines of "if(args[0].startsWith("u:"))" but I don't understand how to get whatever is after that. E.g. I use /command uink__Slime. How do I get just "Pink__Slime"?

ALSO, this is something I want to know.
If I wanted to have 2 arguments, args[0] and args[1]. How would I allow args[1] to be more than one word.
The ban command is a good example,
/ban USER REASON. The reason can be multiple words but how do you do that? I haven't tried "args" because I figured that would get args[0] as well.

 

args[0].split(":")[1] should get you the pink slime

 

_Waffles_
Thanks!
Any ideas for the second one?

 

int x = 0;
String name = "";
String reason = ""
for(String s : args)
{
if(x == 0)
name += s;
else
reason += s;
x++;
}