Thread: string index out of bounds exeption when attempting to read a string char by char

this is a homework project that i have reached a dead end with.
the object of the program is to read a file, scan each line, cheack for brackets and then number them matching each opening and closing bracket.
however, when it reaches the first bracket, it runs a exception and i can not figure it out.
here is the main loop.

while(inPut.hasNextLine()){
isbracket =inPut.nextLine();

for (int i= 0; i <=isbracket.length() ; i++){
checkIt = Character.toString(isbracket.charAt(i));
System.out.print(CheckBracket(checkIt));}
}
}

here is the method i call to check for brackets

public static String CheckBracket(String checkIt){
int numBracket = 0;
String Checked ="";
if (checkIt.equals("{")){
numBracket++;
Checked = (checkIt) +numBracket;}
if (checkIt.equals("}") && numBracket > 0){
Checked = checkIt +Integer.toString(numBracket);
numBracket--;}
if (checkIt.equals("}") && numBracket == 0){
Checked = (checkIt) + numBracket;}
if (checkIt != null) {Checked = checkIt;}
return Checked;

this is the error
{java.lang.StringIndexOutOfBoundsException: String index out of range: 12
at java.lang.String.charAt(Unknown Source)
at MatchUp2.main(MatchUp2.java:40)

(line 40 is: checkIt = Character.toString(isbracket.charAt(i))
can some one please just point me in the right direction?

lol that had JUST occured to me as well, i have fixed that by subtracting one from the isbracket.length(). now however i have another problem, i can either make it print the whole file in one line, or i can make it print it one work per a line. any ideas how to make it keep the strings intact?