JFrame frame = new JFrame();
        JPanel panel = new JPanel();
        JButton button = new JButton("Button");


        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        button.addActionListener(new ActionListener(){

            @Override
            public void actionPerformed(ActionEvent arg0) {
                //Code which will be executed when the button is pressed
                System.out.println("You pressed the button!");
            }

        });


        frame.add(panel);
        panel.add(new JButton("Button 1"));


        frame.pack();
        frame.setVisible(true);