Access restriction: The type 'MD5' is not API

兩種方法: ①項目右鍵–>Properties–>Java Build Path,切換到libraries tab頁,找到JRE System Library移除, 然後再點擊Add Library–>JRE System Library添加即可。  ②項目右鍵–>Properties–>Java Build Path,切換到libraries tab頁,找到JRE System Library,
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