java 如何将一个字符串转换为arraylist

string 转 ArrayList
先将字符串按照某个字符切割，转为string数组
然后用Arrays的asList方法，将数组转为List
public class test1 {
    public static void main(String[] args)  {
        //string 转 ArrayList
        String str1 = "a,b,c";
        ArrayList<String> list = 
        new ArrayList<String>(Arrays.asList(str1.split(",")));
        System.out.println(list);
    }
}

ArrayList 转 string
public class test1 {
    public static void main(String[] args)  {
        //ArrayList 转 string
        ArrayList<String> list = new ArrayList<String>();

        list.add("a");
        list.add("b");
        list.add("c");

        System.out.println(list);//[a, b, c]

        String list_str = StringUtils.join(list,",");

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