Java StringBuilder方法charAt，setCharAt，getChars和reverse。

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public class Main // 来 自 n o w j a v a . c o m

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{

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   public static void main(String[] args)

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   {

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      StringBuilder buffer = new StringBuilder("hello there");

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

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       System.out.printf("Character at 0: %s\nCharacter at 4: %s\n\n", 

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         buffer.charAt(0), buffer.charAt(4));

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      char[] charArray = new char[buffer.length()];

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      buffer.getChars(0, buffer.length(), charArray, 0);

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      System.out.print("The characters are: ");

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      for (char character : charArray)

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         System.out.print(character);

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      buffer.setCharAt(0, 'H');

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      buffer.setCharAt(6, 'T');

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

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      /**

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