i am working on some java application.

First it runs some GUI and then if button is pushed it runs processing

2. class Gui{
3. //creating some gui
4. 
   
5. picture = new TextManipulation();
6. picture.backgroundG = green;
7. picture.backgroundR = red;
8. picture.backgroundB = blue;
9. picture.picturePath = path.getText();
10. picture.text = text.getText();
11. picture.runSketch(new String[] { "--present", "textManipulation.TextManipulation" }, null);
12. return null;
13. }
14. 
    
15. }

2. public class TextManipulation extends PApplet {
3. static String picturePath = "";
4. static String text = "";
5. static float backgroundR = 0;
6. static float backgroundG = 0;
7. static float backgroundB = 0;
8. 
   
9. 
   
10. public void setup() {
12. }
13. 
    
14. public void draw() {
15.                   //do something with image
16. PImage file = get();
17. file.save(output);
18. exit();
19. }
20. }
 

When i call exit, program exits with GUI, but i don't  want that. i want my gui still running so people can change some parameters and make another picture in processing.

Can anyone help me?