src/main/java/com/fishercoder/solutions/_405.java

package com.fishercoder.solutions;

public class _405 {

    public static class Solution1 {
        public String toHex(int num) {
            char[] hexChars =
                    new char[]{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd',
                            'e', 'f'};
            String result = "";
            while (num != 0) {
                result = hexChars[(num & 15)] + result;
                num >>>= 4;
            }
            return result.isEmpty() ? "0" : result;
        }
    }
}