405. 数字转换为十六进制数

https://leetcode-cn.com/problems/convert-a-number-to-hexadecimal/

 

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class Solution {     public String toHex(int num) {         if(num==0) return "0";         StringBuilder sb = new StringBuilder();         char[] chars={'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};         while(sb.length()<8 && num!=0){             sb.append(chars[num&0xf]);             num >>= 4;         }         return sb.reverse().toString();     } }