code: public JSONWriter array() throws JSONException {
      if (this.mode == 'i' || this.mode == 'o' || this.mode == 'a') {
        this.push(null);
        this.append("[");
        this.comma = false;
        return this;
      }
      throw new JSONException("Misplaced array.");
    }
docs: Begin appending a new array. All values until the balancing <code>endArray</code> will be appended to this array. The <code>endArray</code> method must be called to mark the array's end.
  
  @return this
  @throws JSONException
  If the nesting is too deep, or if the object is started in the wrong place (for example as a key or after the end of the outermost array or object).