uppercase - Java converting upper to lower sorting -

i have program sorts lines in text file , puts them in alphabetical order can't sort first word because first word's first letter uppercase , word has have first letter upper case , have no idea how it.

this text file:

santa, better watch step!

how doggie in window?

the quick brown fox jumped on lazy dog.

have read khuth's programming series?

it doesn't better this!

here code:

import java.io.*; import java.util.*;  public class wordsorter { public static void main(string[] args) throws exception { string firsttextfile = "prob10.in.txt"; string secondtextfile = "prob10.out.txt"; scanner document = null; printwriter newfile = null; string inputfile = ""; string outputfile = "";  try{     document = new scanner(new file(firsttextfile)); } catch(exception e){     system.out.println("could not find " + firsttextfile);     system.exit(0); }  try{     newfile = new printwriter(new fileoutputstream(secondtextfile, true)); } catch(exception f){     system.out.println("could not find " + secondtextfile);     system.exit(0); }  while (document.hasnextline()){ inputfile = document.nextline(); string line = inputfile; line = line.tolowercase(); string[] words = line.split(" ");  arrays.sort(words); newfile.println(arrays.tostring(words)); } document.close(); newfile.close();  } 

}

take @ java's collator ... , since new java have @ example on java coderanch