update code

src/main/java/git/snippet/bit/LeetCode_0191_NumberOf1Bits.java

@@ -8,14 +8,15 @@ package git.snippet.bit;
 // 如果多次调用这个函数，你将如何优化你的算法？
 // LeetCode: https://leetcode.com/problems/number-of-1-bits/
 public class LeetCode_0191_NumberOf1Bits {
+
     // TODO
     // 最优解
     public static int hammingWeight(int n) {
-        n = (n & 0x55555555) + ((n >>> 1) & 0x55555555);
-        n = (n & 0x33333333) + ((n >>> 2) & 0x33333333);
-        n = (n & 0x0f0f0f0f) + ((n >>> 4) & 0x0f0f0f0f);
-        n = (n & 0x00ff00ff) + ((n >>> 8) & 0x00ff00ff);
-        n = (n & 0x0000ffff) + ((n >>> 16) & 0x0000ffff);
+        n = (n & 0b01010101_01010101_01010101_01010101) + ((n >>> 1) & 0b01010101_01010101_01010101_01010101);
+        n = (n & 0b00110011_00110011_00110011_00110011) + ((n >>> 2) & 0b00110011_00110011_00110011_00110011);
+        n = (n & 0b00001111_00001111_00001111_00001111) + ((n >>> 4) & 0b00001111_00001111_00001111_00001111);
+        n = (n & 0b00000000_11111111_00000000_11111111) + ((n >>> 8) & 0b00000000_11111111_00000000_11111111);
+        n = (n & 0b00000000_00000000_11111111_11111111) + ((n >>> 16) & 0b00000000_00000000_11111111_11111111);
         return n;
     }