java将字符串转换成集合

代码展示 

    @Test
    public void test23(){
        Set<String> set = new HashSet<>();
        ("aaaa");
        ("qqqq");
        ("wwww");
        ("eeee");

        List<String> list = new ArrayList<>(set);
        // 将集合转换成以逗号分隔的字符串
        String str = (",", list);
        (str);
        // 将字符串转换成集合
        List<String> asList = ((","));
        (str1 -> (str1));

    }

结果展示 

qqqq,wwww,aaaa,eeee
qqqq
wwww
aaaa
eeee

Process finished with exit code 0