java - JButton takes 2 clicks -

i have main jpanel that's called board has jpanel in 2 `jbuttons' 1 of supposed remove panel when clicked.

public class aditwindow extends jpanel {     private int width;     private int height;  public aditwindow(int x, int y){         super();         setlayout(new boxlayout(this, boxlayout.y_axis));         width=180;         height=60;         setbounds(x, y, width, height);         jbutton addloc = new jbutton("add location");         jbutton addsign = new jbutton("add sign");         addloc.addactionlistener(new actionlistener() {             public void actionperformed(actionevent e) {                 close();                 system.out.println("click");             }         });         addsign.addactionlistener(new actionlistener() {             public void actionperformed(actionevent e) {                 system.out.println("addsign");             }         });         main.font=main.font.derivefont(13f);         addloc.setfont(main.font);         addsign.setfont(main.font);         addloc.setmaximumsize(new dimension(width, 30));         addsign.setmaximumsize(new dimension(width, 30));         addloc.setbackground(new color(0xf6f6f6));         addsign.setbackground(new color(0xf6f6f6));         add(addloc);         add(addsign);         main.board.validate();  private void close(){         system.out.println("close");         main.board.del(this);         } } 

the del method is:

public void del(component c){         remove(c);         validate();         system.out.println("removed");         } 

problem is: reason takes 2 clicks panel removed, lines printed on both clicks. unsure how manage situation.

eidt: if remove validate() line del() method work first click buttons dissapear leaving rectangle background of jpanel on screen.

you might try invoking remove/validate within swingutilities.invokelater() call.