Ubuntu centos手动安装java

Java install

/usr/lib/jvm/jdk1.8.0_161/

sudo mkdir -p /usr/lib/jvm/jdk-9.0.1
sudo mv jdk-9.0.1/* /usr/lib/jvm/jdk-9.0.1/
sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdk1.8.0_161/bin/java" 1
sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/jdk1.8.0_161/bin/javac" 1
sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/lib/jvm/jdk1.8.0_161/bin/javaws" 1

sudo vim /etc/profile

JAVA_HOME=/opt/jdk/jdk1.8.0_161
export JAVA_HOME
export JRE_HOME=$JAVA_HOME/jre
export CLASSPATH=$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH
export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH