// Fig. 14.12: StringBuilderChars.java
// StringBuilder methods charAt, setCharAt, getChars and reverse.

public class StringBuilderChars {
   public static void main(String[] args) {
      StringBuilder buffer = new StringBuilder("hello there");

      System.out.printf("buffer = %s\n", buffer.toString());
      System.out.printf("Character at 0: %s\nCharacter at 4: %s\n\n", 
         buffer.charAt(0), buffer.charAt(4));

      char[] charArray = new char[buffer.length()];
      buffer.getChars(0, buffer.length(), charArray, 0);
      System.out.print("The characters are: ");

      for (char character : charArray) {
         System.out.print(character);
      }

      buffer.setCharAt(0, 'H');
      buffer.setCharAt(6, 'T');
      System.out.printf("\n\nbuffer = %s", buffer.toString());

      buffer.reverse();
      System.out.printf("\n\nbuffer = %s\n", buffer.toString());
   } 
} 


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