Run swing on my phone

Question

When I run a swing application on my phone I saw this Exception

Exception in thread "main" java.awt.HeadlessException:
No X11 DISPLAY variable was set, but this program performed an operation which requires it.
at java.desktop/java.awt.GraphicsEnvironment.checkHeadless(Unknown Source)
at java.desktop/java.awt.Window.<init>(Unknown Source)
at java.desktop/java.awt.Frame.<init>(Unknown Source)
at java.desktop/java.awt.Frame.<init>(Unknown Source)
at java.desktop/javax.swing.JFrame.<init>(Unknown Source)
at Main.<init>(Main.java:4)
at Main.main(Main.java:12)

what does it mean?

Answer 1

there are ways how to run FX on android