import javax.swing.JFrame; import javax.swing.JOptionPane; import javax.swing.UIManager; import javax.swing.Icon; import java.awt.EventQueue; public class Notifier extends JFrame{ //Using a standard Java icon private Icon optionIcon = UIManager.getIcon("FileView.computerIcon"); public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { //create GUI frame new Notifier().setVisible(true); } }); } public Notifier() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //setTitle("Simple Dialog Box Example"); //setSize(500,500); setLocationRelativeTo(null); // Show our warning to first time users JOptionPane.showMessageDialog(this, "Before starting MineCraft, be sure to open your Profile and set the Java Executable to: '%%PREFIX%%/share/minecraft-client/minecraft-runtime'" ,"Important Notification", JOptionPane.PLAIN_MESSAGE); System.exit(0); } }