Derp.java

package demo;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

import java.util.List;
import java.util.ArrayList;
import java.util.Scanner;

public class GUI {

    public static JFrame window;

    public static void main(String[] args) {
        window = new JFrame("To do");
        window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        window.setLayout(new FlowLayout());
        window.setSize(800, 600);
        window.setVisible(true);

        addButton();
    }

    public static void addButton() {
        JButton button = new JButton("Click me!");
        button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                System.out.println("Yes, this does trigger.");
                addButton();
            }
        });

        window.getContentPane().add(button);
        window.repaint();
    }

}