Create number-complement.java

Author: GouravRusiya30

Java/number-complement.java

@@ -0,0 +1,22 @@
+class Solution {
+    public int findComplement(int num) {
+        
+        int numberOfBits = numberOfBits(num);
+        
+        return num ^ ((1 << numberOfBits) - 1);
+    }
+    
+    /**
+    * Method to find out the total number of bits in a number.
+    **/
+    public static int numberOfBits(int num){
+        int countOfBits = 0;
+        
+        while(num != 0){
+            num = num >> 1;
+            countOfBits++;
+        }
+        
+        return countOfBits;
+    }
+}