centos 安装与切换jdk

#首先搜索可安装的 JDK
sudo yum search java-11
或者
sudo yum search java|grep jdk

#安装jdk11
sudo yum -y install java-11-openjdk

#安装目录查看
cd /usr/lib/jvm
java-11-openjdk-11.0.13.0.8-1.el7_9.x86_64 jre jre-11 jre-11-openjdk jre-11-openjdk-11.0.13.0.8-1.el7_9.x86_64 jre-openjdk

#JDK11的环境变量设置
#set java environment
JAVA_HOME=/usr/lib/jvm/java-11-openjdk-11.0.13.0.8-1.el7_9.x86_64
JRE_HOME=$JAVA_HOME/jre
CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
export JAVA_HOME JRE_HOME CLASS_PATH PATH

#JDK 1.8的环境变量设置
# set java environment
JAVA_HOME=/usr/local/java/jdk1.8.0_151
JRE_HOME=/usr/local/java/jdk1.8.0_151/jre
CLASS_PATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib
PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin
export JAVA_HOME JRE_HOME CLASS_PATH PATH

 

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