This is the part of the code i've been having trouble with... It prints a string but it runs off the left side when it becomes larger. I don't know where I'm going wrong with this.  The cursor can stay between two strings 's' and 's2' which are divided up in an Arraylist full of characters typed. 

2.   if(update){
3.     if(!textField.isEmpty()){
4.       for(int i=0; i<cur;i++){
5.         s+=Character.toString(textField.get(i));
6.       }
7.       
8.       for(int i = cur; i<textField.size();i++){
9.         s2+=Character.toString(textField.get(i));
10.       } 
11.       sw = textWidth(s);
12.     }
13.   }
14.   if(!textField.isEmpty()){text(s,10,50);}
15.   line(10+sw,0,10+sw,100);
16.   if(cur!=textField.size()){text(s2,11+sw,50);}
17.   s="";
18.   s2="";

I recommend running it to try to code out.