jdk help document JDK1.8 && JDK14

JDK1.8 help document:

Link: https://pan.baidu.com/s/1Nfl9-sHn5oKlq-f4XMzw5A
Extraction code: xshy

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JDK14 help document:

Link: https://pan.baidu.com/s/13b-__gXahQLdfwA2ebXFSQ
Extraction code: xshy