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

/**
 * Java demo showing the use of a button and window listener
 * Both listeners are triggered by events that happen asynchronously
 * demo adapted from https://www.tutorialspoint.com/how-to-add-action-listener-to-jbutton-in-java
 * modified Nov 2022 gtowell
 **/

public class SD {
    
   private JFrame frame;
   private JLabel statusLabel;
    int counter=0;

   public SD(){
   }
    
   public static void main(String[] args){
      SD swingControlDemo = new SD();
      swingControlDemo.showButtonDemo();
   }

    /**
     * Set up the JFrame and lay out components
     **/
   private void prepareGUI(){
      frame = new JFrame(Thread.currentThread().getName());
      frame.setSize(500,500);
      frame.setLayout(new GridLayout(3, 1));
      frame.addWindowListener(new WindowAdapter() {
	      // Create an instance of WindowAdapter and override the default implementation of windowClosing method
         public void windowClosing(WindowEvent windowEvent) {
            System.out.println(Thread.currentThread().getName());
            System.exit(0);
         }
      });
      statusLabel = new JLabel("",JLabel.CENTER);
      statusLabel.setSize(350,100);
      frame.add(statusLabel);
      frame.setVisible(true);
   }

    /**
     * Add a button and a button listener
     **/
   private void showButtonDemo(){
       prepareGUI();
       JButton okButton = new JButton("OK");
       okButton.addActionListener(new ActionListener() {
         public void actionPerformed(ActionEvent e) {
	     // create an instance of ActionListener and give a custom implementation of actionPerformed method
            counter++;
	     statusLabel.setText(String.format("Clicked %d   Thread:%s", counter, Thread.currentThread().getName()));
         }
      });
      frame.add(okButton);
      frame.setVisible(true);
   }
}