jdk 环境变量配置 linux

以下三种都可以， 选一个即可

vim  /etc/profile

注意：JAVA_HOME=/devFile/jdk/jdk1.8.0_261  就是你自己的目录
#java environment
export JAVA_HOME=/home/jdk/jdk1.8.0_261
export CLASSPATH=.:${JAVA_HOME}/jre/lib/rt.jar:${JAVA_HOME}/lib/dt.jar:${JAVA_HOME}/lib/tools.jar
export PATH=$PATH:${JAVA_HOME}/bin
 
#java environment
export JAVA_HOME=/home/jdk/jdk1.8.0_261
export CLASSPATH=$:CLASSPATH:$JAVA_HOME/lib/
export PATH=$PATH:$JAVA_HOME/bin
 
#java environment
export JAVA_HOME=/home/jdk/jdk1.8.0_261
export JRE_HOME=${JAVA_HOME}/jre  
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib  
export PATH=${JAVA_HOME}/bin:$PATH

 source /etc/profile