code: private static Object getDataFromList(List dataList,int index){
  		int size=dataList.size();
  		while(size<index+1){
  			dataList.add(new HashMap());
  			size=dataList.size();
  		}
  		Object retObj=dataList.get(index);
  		return retObj;
  	}
docs: 获取index值时自动填充之前值