Linux jdk installation and environment variable configuration tutorial (jdk-8u144-linux-x64.tar.gz)

It is recommended to use the sudo su command to switch to the root account first, otherwise you may not have permission to operate the /opt directory later.

1. Download and decompress

First go to the official website to download the compressed package jdk-8u144-linux-x64.tar.gz.

After downloading, enter cp jdk-8u144-linux-x64.tar.gz /opt in the terminal to copy the compressed package to the opt directory.
Then go to the opt directory and enter tar -zxvf jdk-8u144-linux-x64.tar.gz to decompress it.

2. Edit the profile file in the etc directory

sudo vi /etc/profile Use the vi command to edit the profile file in the /etc directory. Press i to enter the editing mode. Use the up, down, left, and right keys on the keyboard to move the cursor to the last line as shown in the figure. Add the following to the last line: export JAVA_HOME=/opt/jdk

Press the Esc key to exit edit mode and return to command line mode.
Enter :x to save and exit.

3. Create and edit the java.sh file in the etc/profile.d directory

cd /etc/profile.d Enter the directory
sudo vi java.sh Create the java.sh file and edit it (press i to enter the editing mode)

java.sh edit content:
(You need to write it according to the path here. First go to the opt directory and copy the unzipped path. The displayed path is /opt/jdk1.8.0_144 )

export JAVA_HOME=/opt/jdk1.8.0_144
export PATH=$PATH:/opt/jdk1.8.0_144/bin 

Enter :x to save and exit.

4. Source the global configuration file /etc/profile to check whether the configuration is successful

source /etc/profile global configuration file (if a normal user switches to the root user, enter this command and the previous configuration steps do not need to be repeated)

Use java -version to check whether the configuration is successful. If successful, the result is as shown below:

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