Mega Code Archive
Define the default close operation of a JFrame to EXIT_ON_CLOSE, application will exit by calling System exit()
import javax.swing.JFrame;
public class Main extends JFrame {
public static void main(String[] args) {
Main frame = new Main();
frame.setSize(100, 100);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}