查看安裝目錄java
which java /usr/bin/java ls -lrt /usr/bin/java lrwxrwxrwx. 1 root root 22 Dec 17 15:12 /usr/bin/java -> /etc/alternatives/java ls -lrt /etc/alternatives/java lrwxrwxrwx. 1 root root 46 Dec 17 15:12 /etc/alternatives/java -> /usr/lib/jvm/jre-1.8.0-openjdk.x86_64/bin/java cd /usr/lib/jvm
配置環境變量jvm
export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk.x86_64 export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar export PATH=$PATH:$JAVA_HOME/bin
使環境變量生效code
使環境變量生效 source /etc/profile