Java.lang.ArrayIndexOutOfBoundsException error

Question

Keep getting an ArrayIndexOutOfBoundsException Error; tiried many different trouble shooting techniques but can't seem to crack it.
package changeCase;
import java.io.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
class RenameFile {
public static void main(String args[]) {
try {
     FileReader fr = new FileReader("C:\\Documents and Settings\\rwhitehurst\\Desktop\\Test.txt");
     BufferedReader br = new BufferedReader(fr);
     FileWriter writer = new FileWriter( "C:\\Documents and Settings\\rwhitehurst\\Desktop\\Test1.txt" );
     char c;
     char CharArray[] = new char[300];
     String s;
     String output = "";
     String changeString = "";
while((s = br.readLine()) != null) //Reads in line(s) from files.
{changeString = "";
                        if (s.length() > 0)
                              int r = s.length();
                              s = s.toLowerCase();
                             CharArray = s.toCharArray();
                            //CharArray[0] = Character.toLowerCase(CharArray[0]);
for( int i = 0; i < r; i++){
     if((Character.isWhitespace(CharArray)) || ((!Character.isLetterOrDigit(CharArray[i])) && i < (r-1)))
          //CharArray[i+1] = Character.toUpperCase(CharArray[i+1]);
//System.out.println(CharArray[i+1]);
          for(int t = 0; t < r; t++){
               changeString += CharArray[t];
          changeString = changeString.replaceAll(" ","");
/* Pattern myPattern = Pattern.compile("^([A-Z])");
Matcher myMatcher = myPattern.matcher(changeString);
StringBuffer sb = new StringBuffer();
if (myMatcher.find()) {
myMatcher.appendReplacement(sb, "$1");
sb = new StringBuffer((new String(sb)).toLowerCase());
myMatcher.appendTail(sb);
myPattern = Pattern.compile("\\s");
myMatcher = myPattern.matcher(new String(sb));
changeString = myMatcher.replaceAll("");
changeString = changeString.replaceAll("[-_]",""); //Deletes all special characters from files
changeString = changeString.replaceAll("[)(]",""); //before writing into another file.
changeString = changeString.replaceAll("[.]","");
changeString = changeString.replaceAll("[:]","");
//System.out.println(s);
//s = CharArray;
// s = Character.toString(CharArray);
changeString = changeString + System.getProperty("line.separator");
writer.write(changeString);
System.out.println(changeString);
//System.out.println(s);
//System.out.println(CharArray[0]);
     writer.close();
               fr.close();
                         catch(Exception e)
                         System.out.println("Exception: " + e);

Answer 1

Original code:for( int i = 0; i < r; i++){
     if((Character.isWhitespace(CharArray)) || ((!Character.isLetterOrDigit(CharArray)) && i < (r-1)))
     //CharArray[i+1] = Character.toUpperCase(CharArray[i+1]);
     //System.out.println(CharArray[i+1]);
     }Shouldn't the code look something like this?:
for( int i = 0; i < r; i++){
     if(((Character.isWhitespace(CharArray)) || (!Character.isLetterOrDigit(CharArray[i]))) && i < (r-1))
     //CharArray[i+1] = Character.toUpperCase(CharArray[i+1]);
     //System.out.println(CharArray[i+1]);