// variant of MyArray, using an anonymous inner class for the iterator



import java.util.Iterator;
import java.util.NoSuchElementException;
import java.awt.Point;

public class MyArray3<E> {
    /* internal array to actually hold the data */
    private E [] internalArray;

    // the constructor
    public MyArray3 (int n) {
	internalArray = (E[]) new Object[n];
	// unfortunately this doesn't work due to current Java limitations:
	// internalArray = new E[n];
    }

    public int length() {
	return internalArray.length;
    }

    // get an element
    public E at(int i) {
	return internalArray[i];
    }

    // set an element
    public void set(int i, E value) {
	internalArray[i] = value;
    }

    // return an iterator for this array
    public Iterator<E> iterator() {
	return new Iterator<E>() {
	    private int index = 0;
	    public E next() {
		E temp;
		if (!hasNext())
		    throw new NoSuchElementException("no next element available");
		temp = internalArray[index];
		index++;
		return temp;
	    }
	    public boolean hasNext() {
		return index < internalArray.length;
	    }
	    public void remove() {
		/* this is an optional operation - we don't support it */
		throw new UnsupportedOperationException("remove operation not supported");
	    }
	};
    }

    public static void main(String[] args) {
	MyArray3<Integer> a = new MyArray3<Integer>(2);
	a.set(0, new Integer(50));
	a.set(1, new Integer(100));
	// we can have several iterators active at once on an instance
	// of MyArray
	Iterator<Integer> iter1 = a.iterator();
	Iterator<Integer> iter2 = a.iterator();
	while(iter1.hasNext()) {
	    System.out.println(iter1.next());
	}
	while(iter2.hasNext()) {
	    System.out.println(iter2.next());
	}
    }
}