ArrayList<String> 转化为String数组，报错java.lang.ClassCastException

ArrayList<String> 转化为String数组：

String[] phones = (String[]) list.toArray();

报错：java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to [Ljava.lang.String;

改为如下代码即可：

String[] phones = list.toArray(new String[list.size()]);