### To remove OpenJDK (the one you've already installed)
`sudo apt-get purge openjdk-\*`

### Make a new directory for your new JDK
`sudo mkdir -p /usr/local/java`

### Copy the file to the directory (you should be in that file path)
`sudo cp -r jdk-XuXX-linux-x64.tar.gz /usr/local/java/`

### Extract the file
sudo tar xvzf jdk-XuXX-linux-x64.tar.gz

### You should add this to your PATH now. To do that:
  - Open `/etc/profile` : `sudo gedit /etc/profile` (**or** `/etc/environment`)
  - Scroll down (the end) and add the path where your jdk was installed
  -
```bash
JAVA_HOME=/usr/local/java/jdk1.8.0_xx
PATH=$PATH:$HOME/bin:$JAVA_HOME/bin
export JAVA_HOME
export PATH
```
 - Save and exit

### Inform your Linux system where your Oracle Java JDK/JRE is located.
  - Notify the system that Oracle Java JRE is available for use
    `sudo update-alternatives --install "/usr/bin/java" "java" "/usr/local/java/jdk1.8.0_xx/bin/java" 1`

  - Notify the system that Oracle Java JDK is available for use
    `sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/local/java/jdk1.8.0_xx/bin/javac" 1`

  - Notify the system that Oracle Java Web start is available for use
    `sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/local/java/jdk1.8.0_xx/bin/javaws" 1`

### Inform your Linux system that Oracle Java JDK/JRE must be the default Java.
  - Set the java runtime environment for the system
   `sudo update-alternatives --set java /usr/local/java/jdk1.8.0_xx/bin/java`

  - Set the javac compiler for the system
   `sudo update-alternatives --set javac /usr/local/java/jdk1.8.0_xx/bin/javac`

  - Set Java Web start for the system
    `sudo update-alternatives --set javaws /usr/local/java/jdk1.8.0_xx/bin/javaws`
### Reload your system wide PATH
`source /etc/profile`