rpm -qa|grep java

rpm -e --nodeps java-1.8.0-openjdk-devel-1.8.0.242.b08-0.el7_7.x86_64
rpm -e --nodeps java-1.8.0-openjdk-1.8.0.242.b08-0.el7_7.x86_64
rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.242.b08-0.el7_7.x86_64

rpm -e --nodeps java-1.7.0-openjdk-1.7.0.141-2.6.10.5.el7.x86_64
rpm -e --nodeps  java-1.7.0-openjdk-headless-1.7.0.141-2.6.10.5.el7.x86_64

cd /root

mkdir /usr/local/java

tar -zxvf jdk-8u241-linux-x64.tar.gz -C /usr/local/java

vim /etc/profile

export JAVA_HOME=/usr/local/java/jdk1.8.0_241

export CLASSPATH=.:${JAVA_HOME}/jre/lib/rt.jar:${JAVA_HOME}/lib/dt.jar:${JAVA_HOME}/lib/tools.jar

export PATH=$PATH:${JAVA_HOME}/bin

source /etc/profile

java -version