/**
* xqx 去除未知object集合的重复数据
* @param oldList 老数据集合
* @param newList 新数据集合
* @param key 唯一标识
* @param <T>
* @return
*/
public static <T>ArrayList removeRepeatElement(List<T> oldList , List<T> newList , String key){
ArrayList<T> resultList = new ArrayList<>();
ArrayList<String> keys = new ArrayList<>();// 老数据中存在的唯一标识
// 获取到原来数据中的所有位置标识
for (int i = 0; i < oldList.size(); i++) {
try {
JSONObject oldDataJson = new JSONObject(new Gson().toJson(oldList.get(i), Object.class));
String currentKey = String.valueOf(oldDataJson.get(key));
if (!keys.contains(currentKey)){
keys.add(currentKey);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
// 遍历新的数据,如果有相同的唯一标识,则remove
for (int i = newList.size()-1; i >=0 ; i--) {
try {
JSONObject newDataJson = new JSONObject(new Gson().toJson(newList.get(i), Object.class));
String currentKey = String.valueOf(newDataJson.get(key));
if (keys.contains(currentKey)){
// 重复key
newList.remove(i);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
// 避免返回null
if (newList!=null){
resultList.addAll(newList);
}
return resultList;
}