Main

package chargenerator;

public class Main {

    public static void main(String[] args) {
        CharGenerator generator = new CharGenerator('a', 'c', 3);
        String generated;
        String first = generated = generator.getNext();
        do {
            System.out.println(generated);
            generated = generator.getNext();
        } while (!generated.equals(first));
    }

}