1.安装OpenJDK1.7 and OpenJDK1.8
# sudo add-apt-repository ppa:openjdk-r/ppa //增加源
# sudo apt-get update
# sudo apt-get install openjdk-7-jdk //安装jdk1.7
# sudo apt-get install openjdk-8-jdk //安装JDK1.8
2.配置OpenJDK1.7 or OpenJDK1.8两种方式
方式一:配置OpenJDK1.8
# emacs /etc/profile
export PATH=/usr/lib/jvm/java-8-openjdk-amd64/bin:$PATH
方式二:配置OpenJDK1.7
创建test.sh
#!/bin/bash
export JAVA_HOME=/usr/lib/jvm/java-7-openjdk-amd64
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:${JRE_HOME}/bin:$PATH
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