http://tecadmin.net/steps-to-install-java-on-centos-5-6-or-rhel-5-6/
tar xzf jdk-7u79-linux-x64.tar.gz
# cd /opt/jdk1.7.0_79/ # alternatives --install /usr/bin/java java /opt/jdk1.7.0_79/bin/java 2 # alternatives --config java
# alternatives --install /usr/bin/jar jar /opt/jdk1.7.0_79/bin/jar 2 # alternatives --install /usr/bin/javac javac /opt/jdk1.7.0_79/bin/javac 2 # alternatives --set jar /opt/jdk1.7.0_79/bin/jar # alternatives --set javac /opt/jdk1.7.0_79/bin/javac
# java -version java version "1.7.0_79" Java(TM) SE Runtime Environment (build 1.7.0_79-b15) Java HotSpot(TM) 64-Bit Server VM (build 24.79-b02, mixed mode)
# export JAVA_HOME=/opt/jdk1.7.0_79
# export JRE_HOME=/opt/jdk1.7.0_79/jre
# export PATH=$PATH:/opt/jdk1.7.0_79/bin:/opt/jdk1.7.0_79/jre/bin
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