How to download jdk in centos

1. Download the jdk tar package

##2 , Uninstall the jdk that comes with the system

Because the CentOS7.4 system I installed here comes with jdk1.8, so I need to uninstall the jdk that comes with the system first

View the current system jdk Version:

java -version

## List packages matching installed java:

yum list installed | grep java

Uninstall jdk:

yum -y remove java-1.7.0-openjdk*
yum -y remove java-1.8.0-openjdk*

3 , install the downloaded jdk

Create a new java folder in /usr/, mkdir java uses Xftp to upload the downloaded jdk-8u211-linux-x64.tar.gz to /usr/java , need

chmod 777 /usr/java

to decompress the package:

tar -zxvf jdk-8u211-linux-x64.tar.gz

4. Configure environment variables

##Use vim /etc/profile to edit the profile file input ：

 vim /etc/profile

Press i to enter the editing mode, and append the following content to the file:

export JAVA_HOME=/usr/java/jdk1.8.0_211
export JRE_HOME=$JAVA_HOME/jre
export CLASSPATH=$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH
export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH

After editing is completed, press Esc and enter: wq to exit

Save and exit. At this time, the environment variable To take effect, you need to execute

source /etc/profile

echo to check whether it takes effect

echo $JAVA_HOME
/usr/java/jdk1.8.0_211

After the environment variables are set, enter: java, javac, java -version and it is normal to be able to access the content.

Recommended tutorial:

centos tutorial

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