*
 * <pre>
 * import static org.codelibs.core.collection.MultiIterator.*;
 *
 * List&lt;String&gt; list = ...;
 * Set&lt;String&gt; set = ...;
 * Map&lt;String, Object&gt; map = ...;
 * for (String element : iterable(list, set, map.keySet())) {
 *     ...
 * }
 * </pre>
 *
 * @author koichik
 * @param <E> the element type
 */
public class MultiIterator<E> implements Iterator<E> {

    public void test() {
        final List<String> list1 = asList("Foo", "Bar");
        final List<String> list2 = asList("Baz");

        @SuppressWarnings("unchecked")
        final Iterator<String> it = new MultiIterator<String>(list1.iterator(), list2.iterator());

        assertThat(it.hasNext(), is(true));
        assertThat(it.next(), is("Foo"));

        assertThat(it.hasNext(), is(true));
        assertThat(it.next(), is("Bar"));