CyclicRotation

import java.util.Arrays;

import java.util.stream.Collectors;

public class CyclicRotation {

     public static void main(String[] args) {

          print(solution(3, 1, 2, 3, 4, 5));

     }

     public static int[] solution(int k, int... a) {

          int l = a.length;

          int[] r = new int[l];

          for (int i = 0; i < l; i++) {

               r[(i + k) % l] = a[i];

          }

          return r;

     }

     public static void print(int... a) {

          System.out.println("[" + Arrays.stream(a).boxed().map(x -> x.toString()).collect(Collectors.joining(",")) + "]");

     }

}

Prime Number

import java.util.stream.IntStream;

public class PrimeNumber {

    

     public static void main(String[] args) {

          PrimeNumber primeNumber = new PrimeNumber();

          System.out.println(primeNumber.isPrime(2));

          System.out.println(primeNumber.isPrime(9));

     }

    

     public boolean isPrime(int number) {

          if (number > 1) {

               return !IntStream.rangeClosed(2, (int) Math.sqrt(number)).anyMatch(x -> number % x == 0);

          }

          return false;

     }

}

Output:

true

false