Category "joptionpane"

Unresolved compilation problem exception using JOptionPane

I am a beginner in Java and I am trying to use JOptionPane to display a message box but keep getting stuck with an error which I cannot figure out. This is my c

Unresolved compilation problem exception using JOptionPane

I am a beginner in Java and I am trying to use JOptionPane to display a message box but keep getting stuck with an error which I cannot figure out. This is my c