1. Check the system version of your linux installation
method one:
cat /etc/redhat-release
Method Two:
cat /proc/version
The CentOS 7 I installed here uses yum to install java this time
2. View the jdk version that yum can install
yum list java*
3. Install jdk
This time choose to install java-1.8.0-openjdk-devel.x86_64
yum install java-1.8.0-openjdk-devel.x86_64
4. Configure global variables
Open the configuration file and press i to enter the edit mode
vim /etc/profile
Copy the following code to the end of the file, Esc to exit the editing mode: wq Save and exit JAVA_HOME The installation location is subject to your actual installation location
export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.275.b01-0.el7_9.x86_64
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin
Enter source /etc/profile to make global variables take effect immediately
source /etc/profile
5. Check if the installation is successful
java -version
