Installations of JAVA and IntelliJ 1. Install JAVA SE JDK : Install JAVA JDK-11 using the following command line: rn@rn-Lenovo-G50-30:~$ sudo apt install openjdk-11-jdk      //Press Enter Once java is installed, you can verifyusing rn@rn-Lenovo-G50-30:~$ java --version                //after finish te following message will be displayed openjdk 11.0.10 2021-01-19 OpenJDK Runtime Environment (build 11.0.10+9-Ubuntu-0ubuntu1.20.04) OpenJDK 64-Bit Server VM (build 11.0.10+9-Ubuntu-0ubuntu1.20.04, mixed mode, sharing) rn@rn-Lenovo-G50-30:~$ IntelliJ  IntelliJ IDEA is a cross-platform IDE that provides consistent experience on the Windows, macOS, and Linux operating systems. We do not need to install Java to run IntelliJ IDEA because JetBrains Runtime is bundled with the IDE (based on JRE-11). However, to develop Java applications, a standalone JDK is required IntelliJ IDEA is available in