Check If One String Is Rotation of Another | Java 8 Tricky Interview Coding Question

April 26, 2026

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package org.practice.basicprgms;

import java.util.stream.IntStream;

public class CheckStringIsRotationOfAnother {

	public static void main(String[] args) {
		String s1 = "ABCD";
		String s2 = "BCDA";		
		boolean result = false;
				
		// Solution 1 : Using contains method
		result = s1.length() == s2.length() && 
					(s1 + s1).contains(s2);
		System.out.println("Using contains method : Is Rotation String : "+ result);
		
		// Solution 2 : Using Regular Expression
		result = false;
		result = s1.length() == s2.length() && 
				(s1 + s1).matches(".*"+ s2 + ".*");
		System.out.println("Using Regular Expression : Is Rotation String : "+ result);		

		// Solution 3 : Using indexOf method
		result = false;
		result = s1.length() == s2.length() && 
				 (s1 + s1).indexOf(s2) != -1;
		System.out.println("Using indexOf method : Is Rotation String : "+ result);	

		// Solution 4 : Using rangeClosed and anyMatch method
		result = false;
		result = s1.length() == s2.length() &&
				IntStream.rangeClosed(0, s1.length())
						.anyMatch(i -> (s1.substring(i) + s1.substring(0, i)).equals(s2));
		System.out.println("Using rangeClosed and anyMatch method : Is Rotation String : "+ result);				
		
		// Solution 5 : Using rangeClosed, filter and findFirst method
		result = false;
		result = s1.length() == s2.length() &&
				IntStream.rangeClosed(0, s1.length())
						.mapToObj(i -> s1.substring(i) + s1.subSequence(0, i))
						.filter(str -> str.equals(s2))
						.findFirst()
						.isPresent();
		System.out.println("Using rangeClosed, filter and findFirst method : Is Rotation String : "+ result);
		
		// Solution 6: Using rangeClosed, mapToObj and anyMatch method
		result = false;
		result = s1.length() == s2.length() &&
				IntStream.rangeClosed(0, s1.length())
						.mapToObj(i -> s1.substring(i) + s1.subSequence(0, i))
						.anyMatch(str -> str.equals(s2));
		System.out.println("Using rangeClosed, mapToObj and anyMatch method : Is Rotation String : "+ result);
		
		
	}
}

output:
Using contains method : Is Rotation String : true
Using Regular Expression : Is Rotation String : true
Using indexOf method : Is Rotation String : true
Using rangeClosed and anyMatch method : Is Rotation String : true
Using rangeClosed, filter and findFirst method : Is Rotation String : true
Using rangeClosed, mapToObj and anyMatch method : Is Rotation String : true