Ubuntu 安装java

1.Java下载地址

http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

 

2.解压

tar -zxvf jdk-8u181-linux-x64.tar.gz

3.新建文件夹

sudo mkdir /usr/java

 4.移动文件

sudo mv ./jdk1.8.0_181 /usr/java

 

sudo gedit /etc/profile

 5.添加PATH

export JAVA_HOME=/usr/java/jdk1.8.0_181
export JRE_HOME=/usr/java/jdk1.8.0_181/jre
export CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH
export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH

 

6.使环境变量生效 

source /etc/profile

7.查看Java版本信息