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How To Read The Words That Are Repeated?

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        // Reads & reports the number of words that are repeated in the sentence!

public class stutter

 public static void main (String[] args)
  String str = " ";
  String[] words = str.split (" ");
  for (int i=0; i<words.length; i++)
      if(words[i].equals(words[i-1]))     //Stuttered
      System.out.println (words[i]);