import javax.swing.JOptionPane;
import java.awt.Point;

CloseThread closeThread;

void setup() {
}

void draw() {
  background(0);
  text(frameCount, 20, 20);
}

void keyPressed() {
  if (key == ESC) {
    key = 0;
    closeThread = new CloseThread(this);
    closeThread.start();
  }
}

class CloseThread extends Thread {
  
  PApplet p;

  Frame closeFrame;
  int response;

  CloseThread(PApplet p) {
  }

  void run () {
    response = new JOptionPane()
      .showConfirmDialog(null, "Are you sure you want to quit?");
    Point closeLoc = frame.getLocation();
    // java.awt.Frame frame - is a field of PApplet

    println(response);
    println(closeLoc.x);
    
    if(response == 0) exit();
  }
}

2. import javax.swing.JOptionPane;
3. import java.awt.Point;
4. 
   
5. CloseConfirm closeConfirm;
6. //MoveCloseConfirm moveCloseConfirm;
7. 
   
8. void setup() {
9. }
10. 
    
11. void draw() {
12.   background(0);
13.   text(frameCount, 20, 20);
14.   if (closeConfirm != null) {
15.     if (closeConfirm.confirm != null) {
16.       Point  closeLoc = closeConfirm.confirm.getLocation();
17.       println(closeLoc.x);
18.     }
19.   }
20. }
21. 
    
22. void keyPressed() {
23.   if (key == ESC) {
24.     key = 0;
25.     closeConfirm = new CloseConfirm(this);
26.     closeConfirm.start();
27.     // moveCloseConfirm = new MoveCloseConfirm(closeConfirm);
28.     // moveCloseConfirm.start();
29.   }
30. }
31. 
    
32. // - - - - - - - - - - - - - - - - - - - - - - -
33. 
    
34. class CloseConfirm extends Thread {
35. 
    
36.   PApplet p;
37. 
    
38.   JOptionPane confirm;
39.   Frame closeFrame;
40.   int response;
41. 
    
42.   CloseConfirm(PApplet p) {
43.   }
44. 
    
45.   void run () {
46.     confirm =  new JOptionPane();
47.     response = confirm.showConfirmDialog(null, "Are you sure you want to quit?");
48.     //Point closeLoc = frame.getLocation();
49.     // java.awt.Frame frame - is a field of PApplet
50. 
    
51.     //println(response);
52.     //println(closeLoc.x);
53.     // println(closeLoc.y);
54.     Point closeLoc = confirm.getLocation();
55.     println("x: "+closeLoc.x);
56. 
    
57. 
    
58.     if (response == 0) exit();
59.   }
60. }
61. 
    
62. // - - - - - - - - - - - - - - - - - - - - - - -
63. /*
64. 
    
65. class MoveCloseConfirm extends Thread {
66. 
    
67.   CloseConfirm closeConfirm;
68. 
    
69.   MoveCloseConfirm(CloseConfirm closeConfirm) {
70.     this.closeConfirm = closeConfirm;
71.   }
72. 
    
73.   void run() {
74.     println("works");
75.   }
76. }
77. 
    
78. */

import javax.swing.JOptionPane;
import javax.swing.JDialog;

CloseThread closeThread;

void setup() {
}

void draw() {
  background(0);
  text(frameCount, 20, 20);
}

void keyPressed() {
  if (key == ESC) {
    key = 0;
    closeThread = new CloseThread(this);
  }
}

class CloseThread extends Thread {
  
  PApplet p;
  JOptionPane jop;

  CloseThread(PApplet p) {
    jop = 
      new JOptionPane(
        new String("Qestion?"), 
        JOptionPane.QUESTION_MESSAGE,
        JOptionPane.YES_NO_OPTION
      );
    start();
  }

  void run () {
    JDialog jd = 
      jop.createDialog(frame, "Title");
    jd.setVisible(true);
    println("re " + jop.getValue());
    println("loc " + jd.getLocation().x);
  }
  
}