[java] No X11 DISPLAY variable was set, but this program performed an operation which requires it.
​goormIDE is an environment where there is no display.
So if you run it the same way as a normal Java program, an error will occur.
When creating Java projects, we provide templates such as
Java Swing
, JavaFx
, and Java AWT
.
It includes example code and execution commands for GUI execution. You can test it!