Method charAt

classpath/java/lang/StringBuilder.java:115–133

(int i)

  }

  public char charAt(int i) {
    if (i < 0 || i >= length) {
      throw new IndexOutOfBoundsException();
    }

    flush();

    int index = length;
    for (Cell c = chain; c != null; c = c.next) {
      int start = index - c.value.length();
      index = start;
      
      if (i >= start) {
        return c.value.charAt(i - start);
      }
    }

    throw new RuntimeException();
  }

  public StringBuilder insert(int i, String s) {
    if (i < 0 || i > length) {