179. 最大数

public String largestNumber(int[] nums) {
        String[] strs = new String[nums.length];

        for (int i = 0; i < nums.length; i++) {
            strs[i] = String.valueOf(nums[i]);
        }

        Arrays.sort(strs, (s1, s2)->((s2+s1).compareTo(s1+s2)));

        StringBuilder sb = new StringBuilder();

        if (strs[0].equals("0")) return "0";

        for (String x : strs) {
            sb.append(x);
        }
        return sb.toString();
    }