Update Java: 7. Reverse Integer

Author: MaratKhakim

java/7-Reverse-Integer.java

@@ -1,25 +1,19 @@
 class Solution {
-
     public int reverse(int x) {
-        int min = Integer.MIN_VALUE;
-        int max = Integer.MAX_VALUE;
+        boolean isNegative = x < 0;
 
-        int res = 0;
-        while (x != 0) {
-            int digit = x % 10;
-            x = x / 10;
+        x = Math.abs(x);
 
-            if (
-                (res > max / 10) || (res == max / 10 && digit >= max % 10)
-            ) return 0;
+        int num = 0;
 
-            if (
-                (res < min / 10) || (res == min / 10 && digit <= min % 10)
-            ) return 0;
+        while(x > 0) {
+            if (Integer.MAX_VALUE/10 < num)
+                return 0;
 
-            res = (res * 10) + digit;
+            num = 10*num + x%10;
+            x /= 10;
         }
 
-        return res;
+        return isNegative? -num : num;
     }
-}
+}