Reprint: Install JDK under Linux

This article is reproduced in: Detailed steps to install jdk on Linux

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In the process of using linux, you always need to use jdk, and some linux systems come with openjdk, which is always not easy to use; this article takes centos7 as an example to install jdk1.8 version

1: Check whether the Linux system has its own jdk

1. Input: java -version to see if there is a jdk version

2. If there is an input: rpm -qa | grep java to detect jdk installation packages,
3. Then delete packages one by one, input: rpm -e --nodeps + Package name
4. Finally, again: rpm -qa | grep java to check whether the deletion is complete

2: Download jdk from the official website

Official website download link:
https://www.oracle.com/java/technologies/downloads/#java8

Because you need to log in to download jdk now, so here is what I downloaded in advance, and everyone mentions it:
link: https:/ /pan.baidu.com/s/1hr5CsGz8oms85B6tOmzRTA?pwd=gouu

3: Upload jdk installation to the linux server

I put it in the /opt directory here, and it is also recommended to put it in the /usr/local directory

4: Decompress jdk

Use the command to decompress: tar -xvf jdk-8u341-linux-x64.tar.gz

5: Configure environment variables

Use vim /etc/profile to enter the editing state, and add the following configuration

export JAVA_HOME=/opt/jdk1.8.0_341
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

 
 
  
  

 
 
  
  

   
   
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6: Reload the configuration, enter: source /etc/profile

7: Run the test

java -version

javac

jps

So far, the installation of jdk under linux has been completed