JSONArray jsonarray = new JSONArray();
Set<Object> jsonObjects = new HashSet<>();
for (Object obj : jsonarray) {
?? ?JSONObject jsonObject = JSONObject.parseObject(JSONObject.toJSONString(obj));
?? ?if (jsonObject.containsKey("key")) {
?? ? ? ?jsonObjects.add(jsonObject);
? ? }
}
jsonarray.removeAll(jsonObjects);

JSONObject o1 = new JSONObject();
o1.put("key", 324);

JSONObject o2 = new JSONObject();
o2.put("key", 325);

JSONObject o3 = new JSONObject();
o3.put("key", 325);

JSONObject o4 = new JSONObject();
o4.put("key", 327);

JSONArray ja =  new JSONArray();
ja.add(o1);
ja.add(o2);
ja.add(o3);
ja.add(o4);

Iterator<Object> o = ja.iterator();
while (o.hasNext()) {
    JSONObject jo = (JSONObject) o.next();
    if(jo.getIntValue("key") == 325) {
        //ja.remove(jo); //不要用這種方式刪除，會報出ConcurrentModificationException
        o.remove(); //這種方式OK的
    }
}
System.out.println(ja);

/**
 * 移除JSONArray中匹配的元素
 * helper.isBookOrChange獲取類中isBookOrChange值
 * @param jarr 
 * @return
 * @author taiyang
 */
public JSONArray getOrderFilter(JSONArray jarr){
   Iterator<Object> o = jarr.iterator();
   while (o.hasNext()) {
      JSONObject jo = (JSONObject) o.next();
      JSONArray finalArray = null;
      if(!CollectionUtils.isEmpty(jo.getJSONArray("myTicketList"))){
         JSONArray myTicketListArray=jo.getJSONArray("myTicketList");
         //判斷是否是紅色
         finalArray=myTicketListArray.stream().filter(iter -> (BookOrChangeEnum.CHANGE_TICKET.getCode().equals(helper.isBookOrChange)?"紅色":"藍色").equals(((JSONObject) iter).get("ticket_status_name"))).collect(Collectors.toCollection(JSONArray::new));
      }
      if(!CollectionUtils.isEmpty(finalArray)) {
         o.remove(); //移除
      }
   }
   return jarr;
}