Prime Number Answer

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package s2s.javacourse;

/**
 *
 * @author Selvyn
 */
public class PrimeNumberGenerator
{

    public static void main(String args[])
    {
        if( args.length < 2 )
        {
            System.out.println("java s2s.javacourse.PrimeNumberGenerator <lower> <higher>");
            System.exit(1);
        }
        
        int lower = Integer.parseInt(args[0]);
        int upper = Integer.parseInt(args[1]);
        for (int idx = lower; idx < upper; idx++)
        {
            if(idx == 0 || idx == 1)
            {
                System.out.println(idx + " is NOT prime number");
            } else
            {
                boolean isPrimeNo = true;
                int midway = idx / 2;
                for(int i = 2; i <= midway; i++)
                {
                    if(idx % i == 0)
                    {
                        System.out.println(idx + " is NOT prime number");
                        isPrimeNo = false;
                        break;
                    }
                }
                if(isPrimeNo)
                {
                    System.out.println(idx + " is prime number");
                }
            }//end of else
        }
    }
}