ubuntu debian 一键安装java 11

Install Oracle Java 11 (JDK 11) in Ubuntu, Linux Mint or Debian from PPA

To add the LinuxUprising Java PPA repository to your software sources and install Oracle Java 11 in Ubuntu or Linux Mint (64bit only) you can use the commands below:

sudo add-apt-repository ppa:linuxuprising/java
sudo apt update
sudo apt install oracle-java11-installer

In Debian (64bit only) you can add the repository and install Oracle Java 11 using these commands:

su -
echo "deb http://ppa.launchpad.net/linuxuprising/java/ubuntu bionic main" | tee /etc/apt/sources.list.d/linuxuprising-java.list
apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 73C3DB2A
apt-get update
apt-get install oracle-java11-installer
exit

The oracle-java11-installer package has a Recommends field for the oracle-java11-set-default package, which sets Oracle Java 11 as default (including setting the JAVA_HOME environment variable, which requires a session restart). Such recommended packages are installed automatically on Ubuntu, but are not on other Debian-based Linux distributions.

So to make Oracle Java 11 default, install the oracle-java11-set-default package:

sudo apt install oracle-java11-set-default

If you want to have Oracle Java 11 installed but not set it as the default Java, make sure the oracle-java11-set-default package is not installed / remove it:

sudo apt remove oracle-java11-set-default

You can check to see if Oracle Java 11 is set as default by checking your current Java version using the following command:

java -version

If Oracle Java 11 is default, you should see an output similar to the following:

java version "11" 2018-09-25
Java(TM) SE Runtime Environment 18.9 (build 11+28)
Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11+28, mixed mode)

You can try it for javac as well:

javac -version

Which should return an output similar to the one below:

javac 11