Integer to Roman LeetCode solution in Java

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class Solution {
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  static final int[] val = {1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1};
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  static final String[] rom = {
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    "M", "CM", "D", "CD", "C", "XC", "L", "XL", "X", "IX", "V", "IV", "I"
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  };
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  public String intToRoman(int N) {
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    StringBuilder ans = new StringBuilder();
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    for (int i = 0; N > 0; i++)
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      while (N >= val[i]) {
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        ans.append(rom[i]);
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        N -= val[i];
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      }
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    return ans.toString();
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  }
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}