Reverse Words Problem

Hi, i am trying to create a method that will accept a string, it will then return a string with every pair of words in the first string reversed.

For example, input string: " Hello this is a test string to reverse every pair of words "
output string: " this Hello a is string test reverse to pair every words of"

so far i wrote the code below but i am getting out of bounds errors and can't get it to work. can someone please help me and/or suggest the best way to do this..I really appreciate it. Thanks.

//

public static String wordPairReverse(String source){

StringTokenizer st = new StringTokenizer(source, " ");
String strReversedLine = "";
String tempString = "";
String pairs[]= new String[20];
char j=0;
char i=0;

while(st.hasMoreTokens()){

while(j<2){

tempString=st.nextToken()+" "+tempString;
j++;
}
j=0;
pairs[i]=tempString;
i++;
}

while(i>0){
strReversedLine = pairs[i] + " " + strReversedLine;
i--;
}

return strReversedLine;

}
//

Take this in smaller sections. Write a function that takes a single word and returns its reverse. Write another function that takes a String of multiple words and returns an array or an ArrayList of single words. Write yet another function that takes an array or ArrayList of single words and loops through them, calling the reverse function on each.

Please use a Stack collection for your task



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...edited by moderator...

Saurabh Mittal, please read the forum rules and the following link:
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