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Thread: Method to take in a string sentence and reverse the tokens

  1. #1
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    Default Method to take in a string sentence and reverse the tokens

    import java.util.StringTokenizer;
     
    public class StringTokens{
     
      public String reverseWords(String sentence){
        StringTokenizer tokens = new StringTokenizer(sentence);
        String result = "";
     
        while(tokens.hasMoreTokens()){
          String[] t = new String[10];
          for(int j = 0; j < sentence.length(); j++){
            t[j] = tokens.nextToken();
          }
          for(int k = sentence.length()-1; k >= 0; k--){
            result = result + t[k];
          }
        }
        return result;
      }
    }

    The code above compiles but then gives me an error saying "java.util.NoSuchElementException" I believe referring to line 12
    t[j] = tokens.nextToken();


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    Default Re: Method to take in a string sentence and reverse the tokens

    This error comes from how you have the for loop set up. Lets say that sentence = "hello how are you doing today". The length of sentence would be 29 and your loop would therefore use the numbers 0 thru 28. In this case, this would be a problem on 2 fronts:
    1) There are only 6 tokens in "hello how are you doing today"
    2) The size of t is only 10
    So, once the loop gets to j = 6, the tokens in the sentence have already been added and there are no more left hence the error.
    Last edited by KucerakJM; April 25th, 2012 at 06:16 PM.

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