Add Java solution for day28: Counting Bits

Author: qilingit

May-LeetCoding-Challenge/28-Counting-Bits/Counting-Bits.java

@@ -0,0 +1,10 @@
+class Solution {
+    public int[] countBits(int num) {
+        int[] res = new int[num+1];
+        for (int i = 1; i <= num; i++) {
+            res[i] = res[i >> 1] + i % 2;
+        }
+        
+        return res;
+    }
+}