Not Showing A Letter When Using Java Font -

i fooling around in java,when decided make font class, , own fonts. prints right, when type "hello world" code, program shows "hello xorld!". tried switching x , w, shows "hello yorld", , on. fixes?

also, when try type in hello xorld, spits out "hello yorld".

public class font {     private static string chars="abcdefghijklmnopqrsrtuvwxyz      0123456789.,:;'\"!?$%()-=+/      ";      public static void render (string msg,screen screen,int x,int y,int colour){         msg= msg.touppercase();          (int i=0;i<msg.length();i++) {             int charindex= chars.indexof(msg.charat(i));             if (charindex>=0)screen.render(x+(i*8), y, charindex+30*32, colour);         }     } } 

in different class:

font.render("hello world 0157",screen,0,0,colours.get(000,-1,-1,555)); 

in char[] array, have this:

....abcdefghijklmnopqrsrtuvwxyz....       .                      ^ 

note r comes after s. change to:

abcdefghijklmnopqrstuvwxyz 

otherwise every letter after s 1 out of position.