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#打开/etc/profile（sudo vim /etc/profile）在最后面添加如下内容：
export JAVA_HOME=/usr/local/jdk1.7.0_79
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar
#让配置生效：
source /etc/profile
#验证
java –version