在ubuntu上安装 oracle java

1.从oracle官网下载java最新版压缩包

2.解压 “tar -zxvf tarball_name

3.sudo mkdir /usr/lib/java

4.mv jdk1.8.0_40 to /usr/lib/java/

5.执行下面的命令行

sudo update-alternatives –install “/usr/bin/java” “java” “/usr/lib/java/jdk1.7.0_65/bin/java” 1

sudo update-alternatives –install “/usr/bin/javac” “javac” “/usr/lib/java/jdk1.7.0_65/bin/javac” 1

sudo update-alternatives –install “/usr/bin/javaws” “javaws” “/usr/lib/java/jdk1.7.0_65/bin/javaws” 1

6.在这个文件 ~/.bashrc最后添加：

export JAVA_HOME=/usr/lib/java/jdk1.7.0_65

set PATH=”PATH:JAVA_HOME/bin”

export PATH

7.重启

sudo ln -s -v jdk1.7.0_09/bin/java /usr/bin/java