In this post, we will see how to check if one String is rotation of another or not.
For example:
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java2blog and blogjava2 are rotation of each other. java2blog and avablog2j are not rotation of each other. |
Approach:
Lets say you need to check whether str1 and str2 is rotation of one another or not.
- Create a new String with str3= str1 + str1
- Check if str3 contains str2 or not.
- if str3 contains str2 then str2 is rotation of str1 else it is not
Java Program to check if one String is rotation of another.
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package org.arpit.java2blog; public class StringRotationMain { public static void main(String[] args) { System.out.println( "java2blog and blogjava2 are rotation of each other : " + isRotation("java2blog", "blogjava2")); System.out.println( "java2blog and avablog2j are rotation of each other : " + isRotation("java2blog", "avablog2j")); } public static boolean isRotation(String str, String rotation) { String str2 = str + str; if (str2.contains(rotation)) { return true; } return false; } } |
When you run above program, you will get below output:
java2blog and blogjava2 are rotation of each other : true
java2blog and avablog2j are rotation of each other : false
java2blog and avablog2j are rotation of each other : false
That’s all about how to check if one String is rotation of another String in java
