Create f-exuan21.java

number of 1 bits solutions

Author: f-exuan21

number-of-1-bits/f-exuan21.java

@@ -0,0 +1,16 @@
+// time : O(1) 
+// space : O(1)
+
+class Solution {
+    public int hammingWeight(int n) {
+        int count = 0;
+
+        while(n != 0) {
+            if((n&1) == 1) count++;
+            n = n >> 1;
+        }
+
+        return count;
+    }
+}
+