Ubuntu安装、切换openjdk8

1.安装openjdk8

sudo add-apt-repository ppa:openjdk/ppasudo apt-get updatesudo apt-get install openjdk-8-jdk

2.配置

#配置环境变量vim ~/.bashrc#在底部添加：export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64export JRE_HOME=${JAVA_HOME}/jreexport PATH=${JAVA_HOME}/bin:$PATHexport CLASSPATH=.:${AVA_HOME}/lib:${JRE_HOME}/lib#如果之前已经安装了其它版本的jdk,则需要修改javadoccd /etc/alternativesrm javadocrm javadoc.1.gzln /usr/lib/jvm/java-8-openjdk-amd64/bin/javadoc* javadocln /usr/lib/jvm/java-7-openjdk-amd64/man/man1/javadoc.1.gz javadoc.1.gz