Скачать или смотреть How to Install OpenJDK 11 and OpenJDK 8 on Ubuntu 20 04 LTS| How to Install Java on Ubuntu 20.04 LTS

In this Video, We are going to perform How to Install JAVA on Ubuntu 20.04 LTS. Here we are installing OpenJDK 11 and 8 stable version on Ubuntu 20.04 LTS
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How to Install OpenJDK 11 on Ubuntu 20.04 LTS

Lets install OpenJDK 11 on ubuntu 20.04 LTS using below commands.

$ sudo apt update

$ sudo apt install openjdk-11-jdk

Lets verify java version

$ java -version




How to Install OpenJDK 8 on Ubuntu 20.04 LTS

Lets install OpenJDK 8 on ubuntu 20.04 LTS using below commands.

$ sudo apt update

$ sudo apt install openjdk-8-jdk

Lets verify java version

$ java -version




Set Default Java Version using update alternatives

If you have installed multiple Java versions on your system and you want to set Default Java version on Ubuntu. Lets set Default Java Version using update alternatives command,

$ sudo update-alternatives --config java

It prompts for selecting by 0,1,2..so choose accordingly:




Setting the JAVA_HOME Environment Variables
To define the environment variable open the below file:

$ sudo nano /etc/environment

Paste the below variable into the file:

For OpenJDK 8 java is installed at /usr/lib/jvm/java-11-openjdk-amd64/bin/java location


For OpenJDK 11 Java is installed at /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java location
/etc/environment

JAVA_HOME="/usr/lib/jvm/java-11-openjdk-amd64"

Load the environment variable using below command

$ source /etc/environment

Lets verify JAVA_HOME variable

$ echo $JAVA_HOME


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