Question

I have this snippet of the code:

public class Main_class {
    public static void main(String[] args) {

        JFrame first = new JFrame();
        first.setTitle("Hello");
        first.setSize(300, 100);
        first.setLocation(300, 100);
        first.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
        first.setVisible(true);
    }
}

I receive primitive frame, my question is how do I supposed to close the window without windows manager task, thanks in advance

Answer 1

If you want to close it anyways I would implement a close listener that disposes the frame:

public static void main(String[] args) {

    final JFrame first = new JFrame();
    first.setTitle("Hello");
    first.setSize(300, 100);
    first.setLocation(300, 100);

    first.addWindowListener(new WindowAdapter() {
        @Override
        public void windowClosing(WindowEvent e) {

            // do other stuff....

            first.setVisible(false);
            first.dispose();
        }
    });

    first.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
    first.setVisible(true);
}