w3resource

Java: Check if two given strings are rotations of each other

Java String: Exercise-52 with Solution

Write a Java program to check if two given strings are rotations of each other.

Visual Presentation:

Java String Exercises: Check if two given strings are rotations of each other

Sample Solution:

Java Code:

// Importing necessary Java utilities.
import java.util.*;

// Define a class named Main.
class Main {
    // Method to check if one string is a rotation of another string.
    static boolean checkForRotation(String str1, String str2) {
        // Check if both strings have the same length and str2 is found in the concatenated str1+str1.
        return (str1.length() == str2.length()) && ((str1 + str1).indexOf(str2) != -1);
    }

    // Main method to execute the program.
    public static void main(String[] args) {
        // Define two strings for comparison.
        String str1 = "ABACD";
        String str2 = "CDABA";

        // Print the given strings.
        System.out.println("The given strings are: " + str1 + "  and  " + str2);

        // Print the concatenation of the 1st string twice.
        System.out.println("\nThe concatenation of 1st string twice is: " + str1 + str1);

        // Check if the second string is a rotation of the first string.
        if (checkForRotation(str1, str2)) {
            // Print messages when the rotation is found.
            System.out.println("The 2nd string " + str2 + "  exists in the new string.");
            System.out.println("\nStrings are rotations of each other");
        } else {
            // Print messages when the rotation is not found.
            System.out.println("The 2nd string " + str2 + "  does not exist in the new string.");
            System.out.printf("\nStrings are not rotations of each other");
        }
    }
}

Sample Output:

The given strings are: ABACD  and  CDABA

The concatination of 1st string twice is: ABACDABACD
The 2nd string CDABA  exists in the new string.

Strings are rotations of each other

Flowchart:

Flowchart: Java String Exercises - Check if two given strings are rotations of each other

Java Code Editor:

Improve this sample solution and post your code through Disqus

Previous: Write a Java program to count and print all the duplicates in the input string.
Next: Write a Java program to match two strings where one string contains wildcard characters.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.



Become a Patron!

Follow us on Facebook and Twitter for latest update.

It will be nice if you may share this link in any developer community or anywhere else, from where other developers may find this content. Thanks.

https://www.w3resource.com/java-exercises/string/java-string-exercise-52.php