Ubantu installing Oracle JDK

1. Oracle Download from the official website jdk Compressed package ,Java Downloads | Oracle

2. Download the jdk-18_linux-aarch64_bin.tar.gz adopt sftp Upload to Ubantu 

3. decompression jdk-18_linux-aarch64_bin.tar.gz To  /usr/local/java/ Under the path

##  decompression 
tar -zxvf jdk-18_linux-aarch64_bin.tar.gz -C /usr/local/java/

4. Configure environment variables ~/.bashrc

vim ~/.bashrc
export JAVA_HOME=/usr/local/java/jdk-18.0.1.1
export JRE_HOME=/usr/local/java/jdk-18.0.1.1/jre
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib
export PATH=$PATH:$JAVA_HOME/bin:$JRE_HOME/bin

5. Reload ~/.bashrc The configuration file

source ~/.bashrc

6. Check it out java -version

thus ,Ubantu install Oracle JDK complete , In addition, there are other installation methods , Record after subsequent use ！