How to install Java on Fedora with OpenJDK.

Installing OpenJDK 11 on Linux

Download OpenJDK 11 from here.

$ cd /opt/
$ sudo wget
$ sudo tar -xvf openjdk-11+28_linux-x64_bin.tar.gz

A new folder is created:

$ ls

Remove the source file:

$ sudo rm openjdk-11+28_linux-x64_bin.tar.gz

Check the Java version

$ /opt/jdk-11/bin/java -version


openjdk 11 2018-09-25
OpenJDK Runtime Environment 18.9 (build 11+28)
OpenJDK 64-Bit Server VM 18.9 (build 11+28, mixed mode)

Setup environment by editing your .bashrc. Add these to the end of the file.

# openjdk version "13.0.1"
export JAVA_HOME=/opt/jdk-11/
export PATH=/opt/jdk-11/bin:$PATH

The source the file:

$ source ~/.bashrc

Test the Java version:

$ java -version
openjdk 11 2018-09-25
OpenJDK Runtime Environment 18.9 (build 11+28)
OpenJDK 64-Bit Server VM 18.9 (build 11+28, mixed mode)

$ which java

Alternative: Installing Java on Linux with SDKMAN

Source: SDKMAN website

Just run this:

$ curl -s "" | bash

List available packages:

$ sdk list


Java (11.0.10.hs-adpt)

Java Platform, Standard Edition (or Java SE) is a widely used platform for
development and deployment of portable code for desktop and server environments.
Java SE uses the object-oriented Java programming language. It is part of the
Java software-platform family. Java SE defines a wide range of general-purpose
APIs – such as Java APIs for the Java Class Library – and also includes the Java
Language Specification and the Java Virtual Machine Specification.


$ sdk install java

JShell on the Command Line


$ jshell
|  Welcome to JShell -- Version 13.0.1
|  For an introduction type: /help intro


Exit with:

jshell> /exit

The next few lines follow this tutorial.

Start jshell in verbose mode to provide feedback about what you typed.

$ jshell -v

jshell> int x = 45;
x ==> 45
|  created variable x : int

jshell> String twice(String s) {
   ...>     return s + s;
   ...> }
|  created method twice(String)

jshell> twice("Ocean");
$3 ==> "OceanOcean"
|  created scratch variable $3 : String

jshell> String x;
x ==> null
|  replaced variable x : String
|    update overwrote variable x : int

Use tab to autocomplete or show available methods:

jshell> System.c
class  clearProperty(  console()  currentTimeMillis()

Use tab before entering a method’s parameter:

jshell> twice(
$3       twice(   x        

String twice(String s)

<press tab again to see documentation>

String twice(String s)
<no documentation found>

<press tab again to see all possible completions;
total possible completions: 542>

Use vim as an editor within JShell:

jshell> /set editor vim
|  Editor set to: vim

jshell> /edit

It opens vim, which has everything I typed so far. I added a method, then saved, and closed the file:

|  created method cube(double)

jshell> cube(2);
$6 ==> 8.0
|  created scratch variable $6 : double