Method setCharAt

classpath/java/lang/StringBuilder.java:375–379

(int index, char ch)

  }

  public void setCharAt(int index, char ch) {
    if(index < 0 || index >= length) throw new IndexOutOfBoundsException();
    deleteCharAt(index);
    insert(index, ch);
  }

  public void ensureCapacity(int capacity) {
    // ignore