linux 安装JDK

解压jdk

tar -vxf jdk-8u251-linux-x64.tar.gz

配置环境变量：

vim /etc/profile

export JAVA_HOME=/home/soft/jdk1.8.0_251

export JRE_HOME=${JAVA_HOME}/jre

export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib:$CLASSPATH

export JAVA_PATH=${JAVA_HOME}/bin:${JRE_HOME}/bin

export PATH=$PATH:${JAVA_PATH}

source /etc/profile

java -version