java 中字符串String 切割 合并

Question

已下代码 输出后数据为:酸奶(君乐宝),酸奶(小洋人),酸奶(李子园),纯奶,饮料
有没有适合的方法 可以实现 酸奶(君乐宝,小洋人,李子园),纯奶,饮料
谢谢大家~

StringBuilder stringBuilder = new StringBuilder();
        String code="010,011,012,020,030";
        String[] split = code.split(",");
        for (String s : split) {
            //根据 s 查询对应的name
            String  name=selectName(s);
            System.out.println(s + name);
            //输出  010+酸奶(君乐宝)
            //输出  011+酸奶(小洋人)
            //输出  012+酸奶(李子园)
            //输出  020+纯奶
            //输出  030+饮料
            stringBuilder.append(name).append(",");
        }

        System.out.println(stringBuilder.subSequence(0, stringBuilder.length() - 1));
        //输出  酸奶(君乐宝),酸奶(小洋人),酸奶(李子园),纯奶,饮料
        //想要输出   酸奶(君乐宝,小洋人,李子园),纯奶,饮料

ps:有些code对应的name 是没有() 符号的 例 以上代码为例只有01开头的有()号

Answer 1

        //key用来保存”酸奶“、”纯奶“，value则保存对应的括号里面内容，LinkedHashMap则保证了添加顺序
        Map<String, List> map = new LinkedHashMap<>();

        StringBuilder stringBuilder = new StringBuilder();
        String code = "010,011,012,020,030";
        String[] split = code.split(",");
        for (String s : split) {
            //根据 s 查询对应的name
            String name = selectName(s);
            System.out.println(s + name);

            int index1 = name.indexOf("(");
            int index2 = name.indexOf(")");

            //s1:括号外的内容
            String s1;
            //s2:括号里面的内容(不含括号)
            String s2;

            if (index1 == -1) {
                //没有括号
                s1 = name;
                s2 = null;
            } else {
                s1 = name.substring(0, index1);
                s2 = name.substring(index1 + 1, index2);
            }

            List<String> list = map.get(s1);
            if (list == null) {
                list = new ArrayList<>();
                map.put(s1, list);
            }

            if (s2 != null) {
                //相同种类的放到一起
                list.add(s2);
            }
        }

        for (Map.Entry<String, List> entry : map.entrySet()) {
            stringBuilder.append(entry.getKey());
            if (entry.getValue().size() > 0) {
                //有括号的
                stringBuilder.append("(");
                stringBuilder.append(String.join(",", entry.getValue()));
                stringBuilder.append(")");
            } else {
                //没括号的
                stringBuilder.append(String.join(",", entry.getValue()));
            }
            stringBuilder.append(",");
        }

        System.out.println(stringBuilder.subSequence(0, stringBuilder.length() - 1));