摘要: <? extends T>和<? super T>应该怎么用? If your parameter is a producer, it should be <? extends T>, if it's a consumer it has to be <? super T> 即,做生产者的方法的参数用 阅读全文
posted @ 2017-05-28 23:31 Zeffer 阅读(752) 评论(0) 推荐(0) 编辑