Access restriction: The type 'MD5' is not API
两种方法:
①项目右键–>Properties–>Java Build Path,切换到libraries tab页,找到JRE System Library移除, 然后再点击Add Library–>JRE System Library添加即可。
②项目右键–>Properties–>Java Build Path,切换到libraries tab页,找到JRE System Library,点击Edit,选择workspace default jre。