Added task 9.

Author: javadev

src/main/java/s0009.palindrome.number/Solution.java

@@ -0,0 +1,18 @@
+package s0009.palindrome.number;
+
+public class Solution {
+    public boolean isPalindrome(int x) {
+        if (x < 0) {
+            return false;
+        }
+        int rev = 0;
+        int localX = x;
+        while (localX > 0)
+        {
+          rev *= 10;
+          rev += localX % 10;
+          localX /= 10;
+        }
+        return rev == x;
+    }
+}

src/test/java/s0009.palindrome.number/SolutionTest.java

@@ -0,0 +1,12 @@
+package s0009.palindrome.number;
+
+import static org.hamcrest.CoreMatchers.equalTo;
+import static org.hamcrest.MatcherAssert.assertThat;
+import org.junit.Test;
+
+public class SolutionTest {
+    @Test
+    public void isPalindrome() {
+        assertThat(new Solution().isPalindrome(121), equalTo(true));
+    }
+}