PINE64: install Oracle JDK 8

This post show how to install Oracle JDK 8 on PINE64.

1. Download jdk-8u77-linux-arm64-vfp-hflt.tar.gz from Oracle
2. Extract the downloaded file to /opt
   $ sudo tar zxvf jdk-8u77-linux-arm64-vfp-hflt.tar.gz -C /opt
3. Set default java and javac to the extracted JDK 8
   $ sudo update-alternatives --install /usr/bin/javac javac /opt/jdk1.8.0_77/bin/javac 1
   $ sudo update-alternatives --install /usr/bin/java java /opt/jdk1.8.0_77/bin/java 1
4. If you already installed the other JDK like openjdk, update the configuration
   $ sudo update-alternatives --config javac
   $ sudo update-alternatives --config java
5. Check the commands
   $ java -version
   $ javac -version
6. This is a sample code of Sample.java
   

   public class Sample {
     public static void main(String[] args) {
       System.out.println("Java world on PINE64!!");
     }
   }
   

7. Compile the code and run
   $ javac Sample.java
   $ java Sample