问题描述
限时送ChatGPT账号..请帮我将 ArrayList 转换为 String[].ArrayList 包含 Object(VO) 类型的值.
Please help me to convert ArrayList to String[]. The ArrayList contains values of type Object(VO).
例如
问题是我需要将国家列表转换为字符串数组,对其进行排序,然后将其放入列表中.但是我收到了 ClassCastException.
The problem is that I need to convert a country List to String Array, sort it and then put it in a list. However I am getting a ClassCastException.
推荐答案
String [] countriesArray = countryList.toArray(new String[countryList.size()]);
我假设您的国家/地区列表名称是 countryList
.
I have assumed that your country List name is countryList
.
因此要将任何类的 ArrayList 转换为数组,请使用以下代码.将 T 转换为要创建其数组的类.
So to convert ArrayList of any class into array use following code. Convert T into the class whose arrays you want to create.
List<T> list = new ArrayList<T>();
T [] countries = list.toArray(new T[list.size()]);
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