thePrimeDirective.java

// Import statement:
import java.util.ArrayList;
class PrimeDirective {
  
  // Add your methods here:
  public boolean isPrime(int number){
    if (number == 2) {
      return true;
      } else if (number < 2) {
      return false;
  }  
    for (int i = 2; i < number; i++){
      if(number % i == 0) {
        return false;
      }
    }
    return true;
  }
  
    public ArrayList<Integer> onlyPrimes(int[] numbers) {
      ArrayList<Integer> primes = new ArrayList<Integer>();

      for(int number: numbers) {
        if (isPrime(number)) {
            primes.add(number);
        }
      }
      return primes;
    }

  public static void main(String[] args) {

    PrimeDirective pd = new PrimeDirective();
    int[] numbers = {6, 29, 28, 33, 11, 100, 101, 43, 89};


    System.out.println(pd.isPrime(7));
    System.out.println(pd.isPrime(28));
    System.out.println(pd.isPrime(2));
    System.out.println(pd.isPrime(0));

    System.out.println(pd.onlyPrimes(numbers));
  }  

}