java中如何将ArrayList转换为String[]，Arraylist包含VO对象 [英] How to convert ArrayList to String[] in java, Arraylist contains VO objects

问题描述

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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