java：尋找兩個字串的最長公共子串

// 找一個字串的所有子串
    public static List<String> findAllStr(String s) {
        List<String> list = new ArrayList<>();
        for (int i = 0; i < s.length(); i++) {
            for (int j = i + 1; j <= s.length(); j++) {
                list.add(s.substring(i, j));
            }
        }
        return list;
    }

    // 找兩個字串的公共最長子字串,尋找最短公共子字串，修改比較器即可
    public static String findComStr(String sOne, String sTwo) {
        List<String> ls = findAllStr(sOne);
        Collections.sort(ls, new Comparator<String>() {
            @Override
            public int compare(String o1, String o2) {
                return o2.length() - o1.length();
            }
        });
        for (String i : ls) {
            if (sTwo.contains(i)) {
                return i;
            }
        }
        return "";
    }