Linux下JDK的下载安装配置

官网下载jdk linux版本

 rpm -qa | grep jdk

rpm -e --nodeps jdk
yum remove  jdk

 mkdir /usr/java

tar –xvf jdk-8u144-linux-x64.tar.gz  -C /usr/java

vi /etc/profile 

JAVA_HOME=/usr/java/jdk1.8.0_144
CLASSPATH=.:$JAVA_HOME/lib.tools.jar
PATH=$JAVA_HOME/bin:$PATH
export JAVA_HOME CLASSPATH PATH 

source /etc/profile

java -version   
java  
javac