windows：jdk安裝與配置環境變量

# jdk下載：java http://download.oracle.com/otn-pub/java/jdk/8u171-b11/512cd62ec5174c3487ac17c61aaa89e8/jdk-8u171-windows-x64.exewindows http://download.oracle.com/otn-pub/java/jdk/8u172-b11/a58eab1ec2424

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