Rename year directories to allow natural ordering

year2/semester2/CT2109/Assignments/Assignment-03/code/RecursiveReverse.java

@@ -0,0 +1,29 @@
+// class to implement method 4 
+public class RecursiveReverse implements PalindromeChecker {
+    // comparing the String reversed using recursion to the original String (essentially method 1 but with recursion)
+    @Override 
+    public boolean checkPalindrome(String str) {
+        // returning true if the original String is equal to the reversed String, false if not
+        NewPalindrome.operations[3]++; 
+        return str.equals(reverse(str));
+    }
+
+    // method to reverse the characters in a String using recursion 
+    public static String reverse(String str) {
+        // base case - returning an empty String if there is no character left in the String
+        NewPalindrome.operations[3]++;
+        if (str.length() == 0) {    
+            return "";
+        }
+        else {
+            char firstChar = str.charAt(0);                 NewPalindrome.operations[3] += 1 + 1;
+            String remainder = str.substring(1);            NewPalindrome.operations[3] += 1 + 1;   // selecting the rest of the String, excluding the 0th character
+
+            // recursing with what's left of the String
+            String reversedRemainder = reverse(remainder);  NewPalindrome.operations[3]++;
+
+            // returning the reversed rest of String with the first character of the String appended
+            return reversedRemainder + firstChar;
+        }
+    }
+}