*     System.out.println(indexed.getIndex());
 *     System.out.println(indexed.getElement());
 * }
 * </pre>
 *
 * <pre>
 * import static org.codelibs.core.collection.IndexedIterator.*;
 * import static org.codelibs.core.io.LineIterator.*;
 *
 * BufferedReader reader = ...;
 * for (Indexed&lt;String%gt; indexed : indexed(iterable(reader))) {
 *     System.out.println(indexed.getIndex());

        assertThat(indexed1.getIndex(), is(0));
        assertThat(indexed1.getElement(), is("aaa"));

        final Indexed<String> indexed2 = it.next();
        assertThat(indexed2.getIndex(), is(1));
        assertThat(indexed2.getElement(), is("bbb"));

        final Indexed<String> indexed3 = it.next();
        assertThat(indexed3.getIndex(), is(2));
        assertThat(indexed3.getElement(), is("ccc"));

        final ParsePosition pos = new ParsePosition(0);
        final Date date = format.parse(str, pos);
        if (date == null) {
            return null;
        }
        final int index = pos.getIndex();
        if (index == 0) {
            return null;
        }
        if (index < str.length()) {
            return null;
        }
        return date;
    }

    /**

     * 要素を返します。
     *
     * @return 要素
     */
    public T getElement() {
        return element;
    }

    /**
     * インデックスを返します。
     *
     * @return インデックス
     */
    public int getIndex() {
        return index;
    }

        final ParsePosition pos = new ParsePosition(0);
        final Date date = format.parse(str, pos);
        if (date == null) {
            return null;
        }
        final int index = pos.getIndex();
        if (index == 0) {
            return null;
        }
        if (index < str.length()) {
            return null;
        }
        return date;
    }

    /**

        final ParameterizedClassDesc[] parameterDescs = new ParameterizedClassDesc[parameterTypes.length];
        for (final Indexed<Type> parameterType : indexed(iterable(parameterTypes))) {
            parameterDescs[parameterType.getIndex()] = createParameterizedClassDesc(parameterType.getElement(), map);
        }
        desc.setArguments(parameterDescs);
        return desc;
    }

        final ParsePosition pos = new ParsePosition(0);
        final Date date = format.parse(str, pos);
        if (date == null) {
            return null;
        }
        final int index = pos.getIndex();
        if (index == 0) {
            return null;
        }
        if (index < str.length()) {
            return null;
        }
        return date;
    }

    /**