LIST 去除并合并重复记录

List oldList=new ArrayList();//有数据的对象List newList=new ArrayList();//合并后的新对象for (int j = 0; j < oldList.size(); j++){Object o =  oldList.get(j);boolean isExist = false;for (Object obj : newList){Object detail = obj;if (obj==o)//去除重复的条件{//进行一些合并操作，比如累计数量，金额o.setXXX("");isExist = true;break;}}if (!isExist){newList.add(o);}}