Beanshell

import org.json.*;

String aa=vars.get("termidandtime");
JSONArray data = new JSONArray(aa);
int len = data.length();
int index = (int) (Math.random() * len);
JSONObject object = (JSONObject) data.get(index);
int term_id = object.getInt("term_id");
vars.put("term_id",String.valueOf(term_id));

JSONArray class_times = object.getJSONArray("class_times");
len = class_times.length();
index = (int) (Math.random() * len);
String class_time = class_times.getString(index);
vars.put("class_time",String.valueOf(class_time));