import javax.swing.*;
import java.awt.*;
public class FrameExample
{
    static int clicks = 0;
    public static void main(String[] args)
    {
        JFrame frame = new JFrame();
        BorderLayout stuff = new BorderLayout();
        Container c = frame.getContentPane();
        c.setLayout(stuff);
        JButton button = new JButton("Click me!");
        //inside here is a lambda
        //This code is called when the button is clicked
        button.addActionListener( e ->
        {
            button.setText("Done!  Number of clicks: " + clicks);
            clicks++;
        });
        c.add(button, BorderLayout.NORTH);
        
        frame.setSize(300,300);
        
        frame.setVisible(true);
    }
}