Java 10 install on Ubuntu and what's new

OpenJDK 10 was released on 20 March 2018 with new features like:

  • Local-Variable Type Inference - extending type inference of local variables declarations with initializers.
  • Experimental JIT Compiler - integration of the Graal dynamic compiler for the Linux x64 platform
  • Parallel full garbage collection for the G1 garbage collector
  • Docker improvements. If running on Linux systems, the JVM will know if it is running in a Docker container.
  • Shorter startup times for the jShell
  • Improved Garbage-Collector Interface
  • Consolidate the JDK Forest into a Single Repository

You can see the list of all features here: JDK 10 new features

Install java 10 on Ubuntu

You can check how to install java 9 via apt-get: How to install OpenJDK 9 on Ubuntu 16

Since java is not available in apt repository we will donwloaded and then install it. First you need to download the version that you want to use:

select folder for installation:

cd temp

Since I want just to play with this version I'll intall it in folder temp.

wget --no-cookies --no-check-certificate --header "Cookie: oraclelicense=accept-securebackup-cookie" http://download.oracle.com/otn-pub/java/jdk/10+46/76eac37278c24557a3c4199677f19b62/jdk-10_linux-x64_bin.tar.gz

you can see them here: Java SE Development Kit 10 Downloads

then you need to install it by:

tar -xzvf jdk-10_linux-x64_bin.tar.gz

after the installation:

./java -version

because my default java is 9. I need to go the folder of the newly installed jdk and run the java command from there with ./

java version "10" 2018-03-20
Java(TM) SE Runtime Environment 18.3 (build 10+46)
Java HotSpot(TM) 64-Bit Server VM 18.3 (build 10+46, mixed mode)

Test java 10

how to use jshell and commands: Java 9 play with jshell ( interactive java console) Ubuntu

In order to test the newly installed java we will use jshell:

cd jdk-10/bin/
./jshell

and you will see this:

|  Welcome to JShell -- Version 10
|  For an introduction type: /help intro

test new feature: Local-Variable Type Inference

java 10:

jshell> var x = 5
x ==> 5

java 9:

-> var x = 5;
|  Error:
|  cannot find symbol
|    symbol:   class var
|  var x = 5;
|  ^-^

java 10:

var list = new ArrayList<String>();  // infers ArrayList<String>
var stream = list.stream();          // infers Stream<String>

Java 10 info

I will not install java 10 in production because of the small number of changes and the recent realese for java 11 which will be LTS. Still you can install and test this version. Performance and garbage collector improvements are expected.

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