Java -> Can't close window while paint -


i can't close window while painting (i have loop painting 1000x times every 1/10 seconds).

code of program:

public class mycanvas extends canvas{     private static final long serialversionuid = 1l;     private int x = 0;     private int y = 0;     private int = 0;     private int innerw;     private int innerh;     jframe f;     mycanvas() {         super();         f = new jframe();         f.setsize(500,500);         f.setbackground(color.blue);         f.setdefaultcloseoperation(jframe.exit_on_close);;         f.setlayout(new gridlayout());;         f.add(this);         f.setvisible(true);         for(i = 0; i<1000; i++) {             innerw = f.getwidth() - f.getinsets().left - f.getinsets().right;             innerh = f.getheight() - f.getinsets().top - f.getinsets().bottom;             x = (int) (math.random() * innerw);             y = (int) (math.random() * innerh);             try {                 timeunit.milliseconds.sleep(100);             } catch (interruptedexception e) {                 e.printstacktrace();             }             repaint();         }     }     public void paint(graphics g) {         graphics2d g2d = (graphics2d) g;         super.paint(g);         do{             g2d.setcolor(new color((int) (math.random() * 16777216 )));             g2d.filloval(x, y, 25, 25);             f.setdefaultcloseoperation(jframe.exit_on_close);         } while(i<1000);     } }


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