Method subSequence

classpath/java/lang/StringBuilder.java:371–373

(int start, int end)

  }
        
  public CharSequence subSequence(int start, int end) {
    return substring(start, end);
  }

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