How install java to ubuntu on docker?

I tried use docker. I install tool docker and run. I dovnload ubuntu image and run on docker. I make all by this link

For install ubuntu I used docker run -it ubuntu bash

After that I run this ubuntu docker run -i -t ubuntu:latest /bin/bash

After start I placed root@9bca9a2a537d:/#

Now I want install java and start some app on this java.

I tried install java root@cf50a6fdfc10:/# apt-get install default-jre

When this installed i try run this command java -version and I see

root@2e62f448f783:/# java -versionopenjdk version "1.8.0_91"OpenJDK Runtime Environment (build 1.8.0_91-8u91-b14-0ubuntu4~16.04.1-b14)OpenJDK 64-Bit Server VM (build 25.91-b14, mixed mode)

after that i exit from ubuntu

root@2e62f448f783:/# exit

and run again. And when ubuntu started i try

root@20cefe55e2eb:/# java -versionbash: java: command not found

How can I install java or start this java version?