Ubuntu 16.04 installs JDK and configures environment variables (forwarding: https://blog.csdn.net/yan3013216087/article/details/78307258)

System version: Ubuntu  16.04

JDK version: jdk1.8.0_121

1. Download the JDK file jdk-8u121-linux-x64.tar.gz from the official website

I downloaded the latest version here, other versions are also available

2. Create a directory as the JDK installation directory, my directory is /java

java is a system file, just create the /java folder directly in the root directory

sudo mkdir /java

3. Move the file to the /java directory

sudo mv jdk-8u121-linux-x64.tar.gz /java

4. Unzip the file

tar -zxvf jdk-8u121-linux-x64.tar.gz

5. Configure environment variables for all users

 

sudo gedit /etc/profile

Add the following at the end of the file:

#set Java environment

export JAVA_HOME=/dengyang/jdk1.8.0_56
export JRE_HOME=$JAVA_HOME/jre
export CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH
export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH

 

Save and close after modification

6. Enter java -version to display the JDK version description Congratulations, the environment variables are configured correctly