mkdir /usr/java/ && tar xf jdk-8u281-linux-x64.tar.gz -C /usr/java/
vim  /etc/profile

export JAVA_HOME=/usr/java/jdk1.8.0_281
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export JAVA_PATH=${JAVA_HOME}/bin:${JRE_HOME}/bin
export PATH=${JAVA_HOME}/bin:$PATH

source /etc/profile
java -version