apt-get remove openjdk*
apt-key adv --recv-key --keyserver keyserver.ubuntu.com EEA14886
vi /etc/apt/sources.list
"
deb http://ppa.launchpad.net/webupd8team/java/ubuntu trusty main
deb-src http://ppa.launchpad.net/webupd8team/java/ubuntu trusty main
"
apt-get update
apt-get install oracle-java8-installer
// 执行完毕,查看版本
java -version
javac -version
apt-get install oracle-java8-set-default
这个命令运行后,在/etc/profile.d目录下生成:jdk.sh和jdk.csh。里面有5个export命令,用来设置Java环境变量
"
export J2SDKDIR=/usr/lib/jvm/java-8-oracle
export J2REDIR=/usr/lib/jvm/java-8-oracle/jre
export PATH=$PATH:/usr/lib/jvm/java-8-oracle/bin:/usr/lib/jvm/java-8- oracle/db/bin:/usr/lib/jvm/java-8-oracle/jre/bin
export JAVA_HOME=/usr/lib/jvm/java-8-oracle
export DERBY_HOME=/usr/lib/jvm/java-8-oracle/db
"
source /etc/profile
echo $JAVA_HOME
或者将内容复制进 ~/.bashrc
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