BlueJ is a free and open source Java language integrated development environment IDE for Windows, Linux and MacOS. It is educational focused interactive IDE for beginners. You can extend its features via extensions. It is released under the GNU General Public License version 2. It comes with GUI based method calling, terminal, custom class libraries support, JavaFX application support and many more.
How to Install BlueJ IDE on Ubuntu Linux
You need to install flatpak and flathub on your system and restart it after the installation. If you already have then just skip and directly install BlueJ on your system using below commands.
flatpak install flathub org.bluej.BlueJ
Start BlueK IDE using this command after the installation.
flatpak run org.bluej.BlueJ
And uninstall it using below command.
sudo flatpak uninstall org.bluej.BlueJ
Install BlueJ via DEB:
Download BlueJ in .deb package file from the above BlueJ Download link and save in your Downloads folder. Now open the terminal application and run below commands one by one.
sudo apt install ./Downloads/BlueJ-linux-503.deb
Here “BlueJ-linux-503.deb” is the downloaded file name and “Downloads” is the path.