Create 1009. Complement of Base 10 Integer

Author: haibarawu

1009. Complement of Base 10 Integer

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+/***************************************** 
+1009. Complement of Base 10 Integer
+
+Every non-negative integer N has a binary representation.  
+For example, 5 can be represented as "101" in binary, 11 as "1011" in binary, and so on.  
+Note that except for N = 0, there are no leading zeroes in any binary representation.
+The complement of a binary representation is the number in binary you get when changing every 1 to a 0 and 0 to a 1.  
+For example, the complement of "101" in binary is "010" in binary.
+For a given number N in base-10, return the complement of it's binary representation as a base-10 integer.
+
+Example 1:
+Input: 5
+Output: 2
+Explanation: 5 is "101" in binary, with complement "010" in binary, which is 2 in base-10.
+
+Example 2:
+Input: 7
+Output: 0
+Explanation: 7 is "111" in binary, with complement "000" in binary, which is 0 in base-10.
+
+Example 3:
+Input: 10
+Output: 5
+Explanation: 10 is "1010" in binary, with complement "0101" in binary, which is 5 in base-10.
+
+Note:
+0 <= N < 10^9
+****************************************/
+
+
+class Solution {
+    public int bitwiseComplement(int N) {
+        String OriBStr = Integer.toBinaryString(N);
+        int len = OriBStr.length();
+        
+        StringBuilder sb = new StringBuilder();
+        char[] arr = OriBStr.toCharArray();
+        
+        for (int i = 0; i < len; i ++) {
+            if (arr[i] == '1') {sb.append('0');}
+            if (arr[i] == '0') {sb.append('1');}  
+        }
+        
+        int NewB = Integer.valueOf(sb.toString(),2);
+        
+        return NewB;
+    }
+}