Day27_LeetCode179.java

class Solution {
    public String largestNumber(int[] nums) {
      String[] arr = new String[nums.length];

      for(int i=0;i<nums.length;i++){
          arr[i]=nums[i]+"";
      }

      Arrays.sort(arr,(s1,s2)->(s1+s2).compareTo(s2+s1));
      StringBuilder sb = new StringBuilder("");

      for(int i=arr.length-1;i>=0;i--){
          sb.append(arr[i]);
      }

      if(sb.charAt(0)=='0'){
          return "0";
      }else{
          return sb.toString();
      }
    }
}