String转List、List转String

一、String转List

使用Hutool工具类Convert

<dependency>
      <groupId>cn.hutool</groupId>
      <artifactId>hutool-all</artifactId>
      <version>5.7.16</version>
</dependency>

public class Client {

    public static void main(String[] args) {
        String strs = "a,b,c,d";
        List<String> strList = Convert.toList(String.class,strs);

        //4
        System.out.println(strList.size());

        //[a, b, c, d]
        System.out.println(strList);
    }
}

二、List转String

使用JDKStringUtils工具类，逗号拼接成字符串

 public static void main(String[] args) {
        List<String> strList = new ArrayList<String>();
        strList.add("a");
        strList.add("b");
        strList.add("c");
        strList.add("d");

        String strs = StringUtils.join(strList,",");

        //a,b,c,d
        System.out.println(strs);
    }

使用Hutool工具类Convert，数组类型

public static void main(String[] args) {
        List<String> strList = new ArrayList<String>();
        strList.add("a");
        strList.add("b");
        strList.add("c");
        strList.add("d");

        String strs = Convert.toStr(strList);

        //[a, b, c, d] 数组类型
        System.out.println(strs);
    }