How do I install Java on Ubuntu?

Installing the Default OpenJDK (Java 11)

1. First, update the apt package index with: sudo apt update.
2. Once the package index is updated install the default Java OpenJDK package with: sudo apt install default-jdk.
3. Verify the installation, by running the following command which will print the Java version: java -version.

How do I install Java 8 and Java 11 on Ubuntu?

“upgrade java 8 to 11 ubuntu” Code Answer’s

1. sudo apt-get install openjdk-11-jdk.
2. ​
3. $ sudo update-alternatives –config java.
4. There are 2 choices for the alternative java (providing /usr/bin/java).
5. ​
6. Selection Path Priority Status.
7. ​
8. * 0 /usr/lib/jvm/java-9-openjdk-amd64/bin/java 1500 auto mode.