链接: https://pan.baidu.com/s/1p1QUCxHyG_e71jfrT07l8g?pwd=ng8r 提取码: ng8r
https://www.oracle.com/java/technologies/javase-jdk8-doc-downloads.html
https://docs.oracle.com/javase/8/docs/api/?xd_co_f=47c934d9-e663-4eba-819c-b726fc2d0847