jdk under ubuntu, open jdk and oracle jdk divided into two, the former is open source, in fact, will do. But still oracle jdk most people use.
Some blog recommended to install a ppa way, but the link was installed wall, so often fail to install. Now introduce another, manually extract the installation.
1. Download and unzip
Oracle to go to the official website, download linux, 64-bit installation package, tar.gz here for an example. Link below
https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
Create a directory:
sudo mkdir /usr/lib/jvm
Unzip into the directory ::
sudo tar -zxvf jdk-7u60-linux-x64.gz -C /usr/lib/jvm
2. Configure Environment Variables
sudo gedit /etc/profile
Finally, add the following files:
#set Java environment JAVA_HOME Export = / dengyang / jdk1. 8 .0_231 # here according to their own version of jdk export JRE_HOME=$JAVA_HOME/jre export CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH
After modifications are complete save close.
Let environment variables to take effect:
source /etc/profile
3. Enter java -version, display JDK Release Notes Congratulations, environment variables configured correctly