// Fig. 30.12: 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() );
   } // end main
} // end class StringBuilderChars


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