Java将字符串中的每个单词tOGGLE

public class Sample{

   public static void main(String args[]){

      String sample = "Hello How are you";

      String[] words = sample.split(" ");

      String result = "";

      for(String word:words){

         String firstSub = word.substring(0, 1);

         String secondSub = word.substring(1);

         result = result+firstSub.toLowerCase()+secondSub.toUpperCase()+" ";

      }

      System.out.println(result);

   }

}