JDK下载Java Downloads | Oracle解压tar -zxvf jdk-xxx.tar.gz配置环境变量vim ~/.bash_profile --当前用户生效 JAVA_HOME/home/env/jdk-17.0.20 JRE_HOME$JAVA_HOME/jre CLASSPATH.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib PATH$JAVA_HOME/bin:$PATH export PATH JAVA_HOME CLASSPATH#vim /etc/profile – 所有用户生效刷新source ~/.bash_profile