import structure5.*;

public class EvenNumberIterator extends AbstractIterator<Integer> {
    private int counter;

    /* constructor */
    public EvenNumberIterator() {
	reset();
    }

    /* Checks whether there is a next element */
    public boolean hasNext() {
	return true;
    }

    /* Resets the iterator to its original state */
    public void reset() {
	counter = 1;
    }
    
    /* Returns the next element without incrementing the counter. */
    public Integer get() {
	return counter * 2;
    }
    
    /* Returns the next element and then increments the counter. */
    public Integer next() {
	int tmp = get();
	counter++;
	return tmp;
    }
    
    public static void main(String[] args) {
	EvenNumberIterator nums = new EvenNumberIterator();

	for (int n : nums) {
	    if (n > 100) break;
	    System.out.println(n);
	}
    }
}