Introduction to installing JDK under Linux, including uninstalling OpenJDK

1. View openjdk

rpm -qa|grep jdk 

2. Delete openjdk (rpm -e --nodeps)

rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.262.b10-1.el7.x86_64

3. Check whether openjdk has been deleted (same as checking jdk)

rpm -qa|grep jdk

4. Create a java directory under usr, import the installation package into the directory and decompress the files

5. Enter the vim /etc/profile directory and edit the configuration file

export JAVA_HOME=/usr/java/jdk1.8.0_181

6. Make the file effective

source /etc/profile 

7. Check whether jdk is installed

 java -version 

8. Copy the configuration file to other virtual machines (scp -r /etc/profile root@z3:/etc/profile
) Change the blue area to the name of your virtual machine

scp -r /etc/profile root@z3:/etc/profile 

9. Copy the installation package to another virtual machine (scp -r /usr/java root@z3:/usr/java
）Blue font same as above

 scp -r /usr/java root@z3:/usr/java 

10. Use vim /etc/profile on other virtual machines to make the file effective

vim /etc/profile

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