JAVA Programming Interview Question | # 7 Checking whether a string is a palindrome in Java?

Code Link: https://drive.google.com/file/d/10jGW8snLcvM6sAKuBgGKciSLyxpetS-i/view?usp=sharing

A palindrome is a word, phrase, or number that reads the same forwards and backwards. For example, "radar" is a palindrome because it's the same if you read it from left to right or right to left. Another example is the number "121."

Code Explanation:

This Java program takes a string as input from the user, reverses the string, and then checks if the original string is a palindrome (reads the same forwards and backwards).

Here's a breakdown of the code:

1. Importing Scanner: The code starts by importing the `Scanner` class from the `java.util` package. This class is used to read user input.

2. Defining the Main Class: The main class is named `codime`.

3. `main` Method: This is the entry point of the program. It takes command line arguments as parameters (although they are not used in this code).

4. Creating a Scanner Object: A `Scanner` object named `s` is created to read user input from the console.

5. Reading Input: The program prompts the user to enter a string using `System.out.println("\n Enter String: ");` and then uses `s.next()` to read the input string from the user.

6. Displaying Original String: The original input string is displayed using `System.out.println("\n Original String: " + input);`.

7. Reversing the String: The program initializes an empty string `rev` to store the reversed string. It then enters a loop that iterates through each character of the input string. In each iteration, the program appends the current character of the input string to the beginning of the `rev` string. This effectively reverses the input string.

8. Displaying Reverse String: The reversed string (`rev`) is displayed using `System.out.println("\n Reverse String: " + rev);`.

9. Checking Palindrome: The program uses the `equalsIgnoreCase()` method to compare the original input string (`input`) and the reversed string (`rev`). If they are equal (i.e., the input string is the same when read forwards and backwards, regardless of case), the program prints `"The Given String Is Palindrome"`. Otherwise, it prints `"The Given String Is Not Palindrome"`.

10. Closing the `Scanner`: It's good practice to close the `Scanner` object after it's no longer needed. This is typically done using `s.close();`.