Install JDK for CentOS 7 in Yum

The benefit of the Yum installation JDK is that you don't need to manually reconfigure environment variables, and all of the variables are automatically generated

1. Check if there is a JDK in the system, delete the original JDK

If there is no information output, it means that no JDK is installed

Rpm-qa |  -qa |  -qa |grep gcj

Execute command Delete and uninstall information if present

Rpm-qa | grep java | Xargs rpm-e--nodeps

2. Execute command to retrieve a list containing Java

List java*

3. Think I want to install version 1.8 JDK so I need to retrieve a list of java-1.8 information

List java-1.8*

4.yum Mounting jdk1.8

Yum Install java-1.8.0-openjdk*-y

5. Whether the query was successfully installed

Java-version

Install JDK for CentOS 7 in Yum