stringeditor.java

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public class StringEditor {
   public static String removeNonLetters(String original) {
      StringBuffer aBuffer = new StringBuffer(original.length());
      char aCharacter;
      for (int i=0; i<original.length(); i++) {
         aCharacter = original.charAt(i);
         if (Character.isLetter(aCharacter))
           aBuffer.append(new Character(aCharacter));
         }
         return new String(aBuffer);
    }
 }