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I've installed in Ubuntu bionic the following package in a 64 bits system:

apt install openjdk-11-jdk

Now I try the new java:

/usr/lib/jvm/java-11-openjdk-amd64/bin/java -version

openjdk version "10.0.2" 2018-07-17

OpenJDK Runtime Environment (build 10.0.2+13-Ubuntu-1ubuntu0.18.04.4)

OpenJDK 64-Bit Server VM (build 10.0.2+13-Ubuntu-1ubuntu0.18.04.4, mixed mode)

The question is why I'm getting Java 10 instead of 11.

With this command, I see that no other java is installed in my system:

# update-alternatives --config java

If you want to install OpenJDK 11, just press Ctrl+Alt+T on your keyboard to open Terminal. When it opens, run the command(s) below:

sudo add-apt-repository ppa:openjdk-r/ppa

sudo apt-get update

sudo apt install openjdk-11-jdk

Source:1.

Here is an explanation of the confusing name of the package.

The Ubuntu Foundation Team made an SRU exception for OpenJDK. Although
version 10 is a non-LTS release, they've packaged it as openjdk-11-jdk
until OpenJDK 11 goes GA. This choice was based on that assumption
that there is a much smaller interface delta between releases 10 and
11 than it would be between 8 and 11.

That's a fairly good reasoning and perhaps an apt-get upgrade wouldn't
screw things up that badly when OpenJDK's version gets bumped up from
10 to 11.