1)定义一个List集合，并存入多个字符串(例如："sdfa8erg","ghrthw","fa555sdger","thetyjky","def","def","woaiheimadef123","def","zheji5sh9ig4ek","def15dferg")

(2)删除集合元素中为"def"的元素

(3)用迭代器遍历集合元素，并打印输出

(4)删除集合元素中包含数字的元素

(5)用迭代器遍历集合元素，并打印输出

求大神啊  这问题感觉很有难度

1)定义一个List集合，并存入多个字符串(例如："sdfa8erg","ghrthw","fa555sdger","thetyjky","def","def","woaiheimadef123","def","zheji5sh9ig4ek","def15dferg")

(2)删除集合元素中为"def"的元素

(3)用迭代器遍历集合元素，并打印输出

(4)删除集合元素中包含数字的元素

(5)用迭代器遍历集合元素，并打印输出

求大神啊  这问题感觉很有难度