Finally, this method returns the reverse of String. The validation also servers as base case because, after every step, String keeps getting reduced, and eventually it will become empty, there your function will stop Recursion and will use String concatenation to concatenate all character in reverse order. This function first checks if the given String is null or empty, if yes then it returns the same String because they don't require to be reversed.Īfter this validation, it extracts the last character of String and passes rest or String using substring() method to this method itself, hence the recursive solution. This method uses Recursion to reverse String. It then calls the reverse(String text) method to reverse this String. In our solution, we have a static method isPalindromeString(String text), which accepts a String. The program is simple, and here are steps to find palindrome String :Ģ) Check if the reverse of String is equal to itself if yes, then given String is a palindrome. Here is our Java program, which checks if a given String is palindrome or not. Java Program to check if String is Palindrome Using Recursion It's also very affordable and you can buy in just $10 on many Udemy sales which happen every now and then. This is a beautiful course, which contains lots of natural and medium difficulty level coding problems, which will not only help you to prepare for an interview but also develop your programming logic and Data Structure, and Algorithms skills. Here we will use the same logic to check if String is palindrome or not.īy the way, if you are preparing for coding interviews and looking for some coding problem to get hands-on practice, I suggest you take a look at Data Structures and Algorithms: Deep Dive Using Java by Tim Buchalaka and his team on Udemy. If you remember, I already shared the logic of reversing String in my earlier post, how to reverse String in Java using Iteration and Recursion. You can write this reverse() function by using either for loop or by using Recursion. If they are equal then String is palindrome or not. Once you have the original and reversed String, all you need to do is check if they are equal to each other or not. In order to check if String is a palindrome in Java, we need a function that can reverse the String. Recursion means solving a problem by writing a function which calls itself. A String is said to be a palindrome if the reverse of String is equal to itself like "aba" is a palindrome because the opposite of "aba" is also "aba", but "abc" is not a palindrome because the reverse of "abc" is "cba" which is not equal. A String is nothing but a collection of characters like "Java," and String literals are encoded in double-quotes in Java. In this tutorial, you will learn how to check if a string is a palindrome in Java using Recursion.
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