Install Java 11 in ubuntu 18.04

README.txt

Step 1: Download JDK from Oracle
https://www.oracle.com/technetwork/java/javase/downloads/index.html

Step 2: Install the package
sudo dpkg -i jdk-11.0.1_linux-x64_bin.deb

Step 3: Config Java (use jdk-xx.x.x based on your downloaded version)
sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk-11.0.1/bin/java 2
sudo update-alternatives --config java

Step 4: Config Jar and Javac (use jdk-xx.x.x based on your downloaded version)
sudo update-alternatives --install /usr/bin/jar jar /usr/lib/jvm/jdk-11.0.1/bin/jar 2
sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk-11.0.1/bin/javac 2
sudo update-alternatives --set jar /usr/lib/jvm/jdk-11.0.1/bin/jar
sudo update-alternatives --set javac /usr/lib/jvm/jdk-11.0.1/bin/javac