179. 最大数

179. 最大数

class Solution {
    public String largestNumber(int[] nums) {
        String[] asStrs = new String[nums.length];
        for (int i = 0; i < nums.length; i++) 
            asStrs[i] = String.valueOf(nums[i]);
        Arrays.sort(asStrs, (s1, s2)->(s2 + s1).compareTo(s1 + s2));
        if (asStrs[0].equals("0"))
            return "0";
        StringBuilder ans = new StringBuilder();
        for (String numStr : asStrs) 
            ans.append(numStr);
        return ans.toString();
    }
}