import java.util.Iterator;
import java.util.NoSuchElementException;

public class BasicIterator {
    public static class Stepper implements Iterator<Integer>,
                                           Iterable<Integer> {
        private int start, step, end, curr;
       
        public Stepper(int start, int step, int end) {
            this.start = start;
            this.step  = step;
            this.end   = end;
            this.curr  = start;
        }
        public boolean hasNext() {
            return curr < end;
        }
        public Integer next() {
            int n = curr;
            curr += step;
            return n;
        }
        public void remove() {
            throw new UnsupportedOperationException();
        }
        public Iterator<Integer> iterator() {
            return this;
        }
    }
   
    public static void main(String[] args) {
        for(int i : new Stepper(0, 2, 10)) {
            System.out.println(i);
        }
    }
}