How to install Oracle Java 1.8 on Redhat 7

Oracle 的安裝方式比較瑣碎，故再重發一篇

Oracle java 1.8


cd /tmp

#下載安裝檔或是可預先下載檔案複製到 /opt
#其版本網址就自行依需求再調整
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wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/8u101-b13/jdk-8u101-linux-x64.tar.gz"
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tar xzf jdk-8u101-linux-x64.tar.gz
cd /opt/jdk1.8.0_101/

alternatives --install /usr/bin/java java /opt/jdk1.8.0_101/bin/java 2
alternatives --config java
java -version