1、tar -xvf jdkxxx.tar.gz解压到当前目录;
2、vi /etc/profile配置环境变量,
在最后面加上:
export JAVA_HOME=/usr/java
export JRE_HOME=$JAVA_HOME/jre
export PATH=$PATH:$JAVA_HOME/bin
export CLASSPATH=./:$JAVA_HOME/lib:$JAVA_HOME/jre/lib
3、使环境变量生效:source /etc/profile
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