这个面试题，求大神用简单代码解答，谢谢了

具体这个应该怎么作答，作为处级程序员的我没看懂，求大神用简单的代码解答，我怕我看不懂，谢谢了

public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        ArrayList<String> mainList = new ArrayList<String>();
        ArrayList<String> assistList = new ArrayList<String>();
        System.out.println("请输入列表长度");
        int i = scanner.nextInt();
        int k = 0;
        while (k < i) {
            mainList.add("主字符串" + (k + 7));
            assistList.add("辅助字符" + (k + 5));
            k++;
        }
        System.out.println("您的主字符串为：" + mainList);
        System.out.println("您的辅助字符为:" + assistList);
        Map<Integer, String[]> map = new HashMap<Integer, String[]>();
        for (int j = 0; j < mainList.size(); j++) {
            String[] ss = { mainList.get(j), assistList.get(j) };
            map.put(j, ss);
        }
        System.out.println("封装数据为：" + new Gson().toJson(map));
        StringBuffer sb = new StringBuffer();
        for (Entry<Integer, String[]> entry : map.entrySet()) {
            String[] value = entry.getValue();
            sb.append("<").append(value[0]).append(">").append(value[1])
                    .append("</").append(value[0]).append(">,");
        }
        System.out.println("解析数据为:" + sb.substring(0, sb.length() - 1));

    }

你看一下符不符合要求