valid-palindrome

Author: chjung99

valid-palindrome/chjung99.java

@@ -0,0 +1,19 @@
+class Solution {
+    public boolean isPalindrome(String s) {
+        String filterd = s.toLowerCase();
+        StringBuilder filterdBuilder = new StringBuilder();
+
+        for (int i = 0; i < filterd.length(); i++){
+            Character c = filterd.charAt(i);
+            if (Character.isLetterOrDigit(c)){
+                filterdBuilder.append(c.toString());
+            }
+        }
+
+        String ori = filterdBuilder.toString();
+        String rev = new StringBuilder(ori).reverse().toString();
+
+        return rev.equals(ori);
+    }
+}
+