Detailed steps to install JDK environment in Liunx system

1. Download the liunx version jdk compressed package

Enter the JDK official website to download the jdk compressed package. You need to log in to your account before downloading, you can register an account yourself!
You can also use the network disk provided by this blogger to download https://pan.baidu.com/s/1liNHej2hGXJU_L8yQNRZmQ?pwd=9w3f

2. After the download is completed, use the FileZilla tool to upload the compressed package to the Liunx system

To link the Liunx system, I use a virtual machine to directly connect to the virtual machine with a tool and drag it into the virtual machine.

3. The upload is complete and the official installation begins

Use the tool MobaXterm or operate in the terminal of the Liunx system. I use the MobaXterm tool, which can be downloaded from Baidu
Use the command rpm -qa|grep jdk to check whether the jdk environment is installed in the system
If there is no skip, if there is, use the command rpm -e --nodelps ... to delete
Afterwards, use rpm -qa|grep jdk to query again whether the deletion is clean or not. Mine has been deleted and there is no more
Then create a folder to store the decompression package directory by yourself, create the command mkdir ...
Use the command to decompress the jdk environment compression package tar -zxvf ... -C /usr/local/java/ to the file directory you created
Use the command to go to the folder you created to see if it has been successfully decompressed to the directory
Use the command vim /etc/proflie to open the proflie configuration environment variable and add the following command at the end

export JAVA_HOME=/usr/local/java/jdk1.8.0_161
export PATH= $JAVA_HOME/bin:$ PATH
export CLASSPATH=.: $JAVA_HOME/lib/dt.jar:$ JAVA_HOME/lib/tools.jar

Use the command source /etc/profile to update the environment configuration
Use the command to check whether the installation is successful
Query version java -version
compile javac

Congratulations on the above picture, indicating that you have completed the installation.

Digression

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