Install JDK detailed procedure under "Linux" CentOS7

Linux typically installs open JDK, the difference between OPENJDK and JDK: http://www.cnblogs.com/sxdcgaq8080/p/7487369.html

Start the installation steps below:

--------------------------------------------------------------------------the first step-------------------------------------------- ---------------------------

The first step is to unload the system's own openjdk and associated Java files

① in the Command window type:

Java-version

You can see the OPENJDK version information that comes with your system.

② in the Command window type:

Rpm-qa | grep java

Command Description:

RPM Management Suite

-qa use Inquiry mode to query all packages

Grep finds eligible strings in a file

Java finds files that contain Java strings

In the above file:

The following few can be removed

Java-1.7.0-openjdk-1.7.0.111-2.6.7.8.el7.x86_64java-1.8.0-openjdk-1.8.0.102-4.b14.el7.x86_ 64java-1.8.0-openjdk-headless-1.8.0.102-4.b14.el7.x86_64java-1.7.0-openjdk-headless-1.7.0.111-2.6.7.8.el7.x86_ 64

Noarch files can not be deleted

Python-javapackages-3.4.1-11.el7.noarchtzdata-java-2016g-2.el7.noarchjavapackages-tools-3.4.1-11.el7.noarch

③ in the Command window type:

RPM-E--nodeps java-1.7.0-openjdk-1.7.0.111-2.6.7.8.el7.x86_64

However, there is an error, because under normal user sxd user, there is no permission to manipulate these files.

Solve:

In the Command window, type:

Su Root

Enter the root user, you can have permission to manipulate these files.

Complete the command to delete the file, type in the command window:

Rpm-e--nodeps java-1.7.0-openjdk-1.7.0.111-2.6.7.8.el7.x86_64rpm-e--nodeps JAVA-1.8.0-OPENJDK-1.8.0.102-4.B14.EL7.X86_64RPM-E--nodeps java-1.8.0-openjdk-headless-1.8.0.102-4.b14.el7.x86_ 64RPM-E--nodeps java-1.7.0-openjdk-headless-1.7.0.111-2.6.7.8.el7.x86_64

Command Description:

RPM Management Suite

-e Delete the specified package

--nodeps does not verify the correlation of the suite files

④ Check whether it has been deleted successfully

In the Command window, type:

Java-version

The delegate has been deleted successfully.

⑤ if not removed, remove them with yum-y remove

------------------------------------------------------------------------------the second step---------------------------------------- -------------------------------------

Step two download the latest stable JDK

① for

Install JDK detailed procedure under "Linux" CentOS7