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Instal Oracle Java on Ubuntu

First, download java jdk newest version at: Link
Chose Linux tar packet, after download extract it and copy to opt folder (with root permision)
Rename jdk_x.x.x to java.
Add java to system:
#update-alternatives --install /usr/bin/java java /opt/java/jre/bin/java 1
#update-alternatives --set java /opt/java/jre/bin/java
Add javac to system:
#update-alternatives --install /usr/bin/javac javac /opt/java/bin/javac 1
#update-alternatives --set javac /opt/java/bin/javac

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Security Research
All my Lab:
Linux Lab -- window and Cisco Lab
to be continued - I will update more.