Installing OpenJDK

To use the Java development and runtime environment, you need to install OpenJDK.

1. Download and extract the installation archive, and move the directory obtained after extraction to a specified directory (for example, /opt/tools/installed/).

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   wget https://github.com/AdoptOpenJDK/openjdk8-binaries/releases/download/jdk8u252-b09/OpenJDK8U-jdk_aarch64_linux_hotspot_8u252b09.tar.gz --no-check-certificate tar -zxf OpenJDK8U-jdk_aarch64_linux_hotspot_8u252b09.tar.gz mkdir -p /opt/tools/installed/ mv jdk8u252-b09 /opt/tools/installed/

2. Configure Java environment variables.
   1. Open the /etc/profile file.

      1	vi /etc/profile

   2. Press i to enter the insert mode and add the following content to the end of the file:

      1 2	export JAVA_HOME=/opt/tools/installed/jdk8u252-b09 export PATH=$JAVA_HOME/bin:$PATH

   3. Press Esc, type :wq!, and press Enter to save the file and exit.
3. Make the environment variables take effect.

   1	source /etc/profile

4. Check whether OpenJDK is successfully installed.

   1	java -version

   If the following information is displayed, the installation is successful.