public boolean isPrime(long number)

{

    if (number % 2 == 0)
    {
        JOptionPane.showMessageDialog(null, "It is not a prime");
        return false;
    }
    else
    {
        long end = (long) Math.sqrt(number) + 1;
        for (long divisor = 3; divisor <= end; divisor+=2)
        {
            if (number % divisor == 0)
            {
                JOptionPane.showMessageDialog(null, "It is not a prime");
                return false;
            }
        }
        JOptionPane.showMessageDialog(null, "It is a prime");
        return true;
    }

}

public void primesToANumber() //finds all primes
{

}
}

public class runner
    {
    public static void main(String[] args)
    {
        Primes primechecker = new Primes ();
        Primes primesToANumber = new Primes ();
        boolean done = false;

    while (done == false)
    {
        String[] choices = {"Choose 1 if you want to test if a number is prime or not",
                "2",
                "3",
                "4",
                "5",
                "6",
                "7"};

        String s = (String)JOptionPane.showInputDialog(
                null,
                "PLease choose an option",   //the question
                "Your Choice",               //the frame title
                JOptionPane.PLAIN_MESSAGE,      //the icon type
                null,                       //an icon you select
                choices,                    //array of options
                choices[0]);                //the default to be selected

        if(s.equals(choices[0]))
        {
            String numberString = JOptionPane.showInputDialog("Enter any integer");
            long number = Long.parseLong(numberString);
            primechecker.isPrime(number);
        }

        else if(s.equals(choices[1]))
        {
            String numberString1 = JOptionPane.showInputDialog("Enter any integer");
            long num = Long.parseLong(numberString1);
            primesToANumber.primesToANumber(num);
        }