Update 009_Palindrome_Number.java (qiyuangong#14)

* Added a simpler and easy to understand code in java, by @arun-aditya

Author: arun-aditya

java/009_Palindrome_Number.java

@@ -38,4 +38,26 @@ public boolean isPalindrome(int x) {
         }
         return true;
     }
-}
+}
+
+// simpler code 
+
+class Solution {
+    public boolean isPalindrome(int x) {
+        int r,s=0,number=x;
+        if(number<0){
+            return false;
+        }
+        while (number!=0){
+            r=number%10;
+            s= s*10 +r;
+            number/=10;
+        }
+        if (s==x){
+            return true;
+        }
+        else {
+            return false;
+        }
+    }
+}