3、将二进制转换成十六进制

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/* 将二进制转换成十六进制 */ class BinaryToHex {     public static void main(String[] args)     {         int num = 120;         char[] result = new char[1024];         int count = 0;         while((num & 15) > 0)         {             int tmp1 = num & 15;             if(tmp1 > 9)             {                 result[count] = (char)(tmp1 - 10 + 'A');             }else             {                 result[count] = (char)tmp1;             }             count++;             num = num >> 4;         }         int index = 0;         while(result[index] != 0)             index++;<br>　　　　　　　　　 index--;         while(index >= 0)         {             if(result[index] > 9)                 System.out.print(result[index]);             else                 System.out.print((int)result[index]);             index--;         }     } }

重点是在通过&取后四位然后再通过移位再去四位的思想来处理。