java - 如何将 ArrayList hashmap<String,Double[]> 分配给列表

Question

我尝试将 Double[] 的 Hashmap 值分配给 List，但它抛出错误:

"The method add(Double) in the type List is not applicable for the arguments (Double[])"

ArrayList<HashMap<String, Double[]>> arl = (ArrayList<HashMap<String, Double[]>>) pd.getArrayList();

List<Double> empid = new ArrayList<Double>();
Iterator itr = arl.iterator();

while (itr.hasNext()) {
    HashMap<String, Double[]> map = (HashMap<String, Double[]>) itr.next();
    empid.add(map.get("id")));
}

如何将 Double[] 转换为 Double.Request？

Answer 1

如果转换为List<Double>这是你唯一的选择，试试这个:

ArrayList<HashMap<String, Double[]>> arl = (ArrayList<HashMap<String, Double[]>>) pd.getArrayList();

List<Double> empid = new ArrayList<Double>();
Iterator itr = arl.iterator();

while (itr.hasNext()) {
    HashMap<String, Double[]> map = (HashMap<String, Double[]>) itr.next();
    for (Double d : map.get("id") {
        empid.add(d);
    }

}