List<JSONObject> collect = parseObject.collect();

ArrayList<JSONObject> arrayList = new ArrayList<JSONObject>(collect);//没有此转换会java.lang.UnsupportedOperationException 报错

if(collect.size()>0){

Collections.sort(arrayList, new Comparator<JSONObject>() {

public int compare(JSONObject o1, JSONObject o2) {

Date a=o1.getDate("op_ts");

Date b= o2.getDate("op_ts");

if (a.compareTo(b)>0) {

return 1;

} else if(a.compareTo(b)==0) {

return 0;

} else

return -1;

}

});