1.导入hutool的maven依赖

    <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.8.16</version>
        </dependency>

2.直接复制代码运行

import cn.hutool.core.convert.Convert;
import java.util.ArrayList;
import java.util.List;
public class Test {
    
    public static void main(String[] args) throws Exception {
        List<Long> list = new ArrayList<>();
        list.add(1L);
        list.add(2L);
        list.add(3L);
        String[] strArray = Convert.toStrArray(list);
        System.out.println(strArray);
        //转换回去
        List<Long> reverse = Convert.toList(Long.class, strArray);
        System.out.println(reverse);
    }

}