title: Force a stringBuilder to an upper case
body: <p>I was wondering if there is anyway to use something like the toUpperCase for StringBuilder?  Below is my code, I am trying to take user input of a phrase and turn it into an acronym.  Someone helped me out by suggesting StringBuilder but I can't figure out if there is a way to make the acronym upper case.  Any help is greatly appreciated.</p>
  
  <pre><code>public class ThreeLetterAcronym {
  
  public static void main(String[] args) {
      String threeWords;
      int count = 0;
      int MAX = 3;
      char c;
      //create stringbuilder
      StringBuilder acronym = new StringBuilder();
  
      Scanner scan = new Scanner(System.in);
  
      //get user input for phrase
      System.out.println("Enter your three words: ");
      threeWords = scan.nextLine();
  
      //create an array to split phrase into seperate words.
      String[] threeWordsArray = threeWords.split(" ");
  
      //loop through user input and grab first char of each word.
      for(String word : threeWordsArray) {
          if(count &lt; MAX) {
              acronym.append(word.substring(0, 1));
              ++count;
  
          }//end if
      }//end for  
  
      System.out.println("The acronym of the three words you entered is: " + acronym);
      }//end main
  }//end class
  </code></pre>