java - Show popup menu on a jlist -

i have problem popup menu. that want when user click right mouse button on jlist popup menu appear. have created class create popup menu, class extend mouselistener, , class add mouse listener jlist. in class extend mouselistener call class of popup menu , show it. problem popup menu doesn't appear.

package mouselistener;  import java.awt.event.mouseevent; import java.awt.event.mouselistener;  import javax.swing.*;  import view.___poupupmenu___;  public class add_popupmenu_categoria implements mouselistener  {    jlist <string> l = new jlist <string> ();      public add_popupmenu_categoria (jlist <string> l) {     this.l = l; }  public void mouseclicked(mouseevent evt) {     system.out.println("clicked");      if (evt.ispopuptrigger())      {         system.out.println("enter in clicked");          ___poupupmenu___ p = new ___poupupmenu___();          l.setselectedindex(l.locationtoindex(evt.getpoint()));         system.out.println(evt.getcomponent());         l.setcomponentpopupmenu(p.menu_categoria);         p.menu_categoria.show(evt.getcomponent(), evt.getx(), evt.gety());      }  }             public void mouseentered(mouseevent e) {  }  public void mouseexited(mouseevent e) {  }  public void mousepressed(mouseevent evt) {     system.out.println("pressed");      if (evt.ispopuptrigger())      {         system.out.println("enter in pressed");          ___poupupmenu___ p = new ___poupupmenu___();          l.setselectedindex(l.locationtoindex(evt.getpoint()));         system.out.println(evt.getcomponent());         l.setcomponentpopupmenu(p.menu_categoria);         p.menu_categoria.show(evt.getcomponent(), evt.getx(), evt.gety());      }  }  public void mousereleased(mouseevent evt) {      system.out.println("released");      if (evt.ispopuptrigger())      {         system.out.println("enter in released");          ___poupupmenu___ p = new ___poupupmenu___();          l.setselectedindex(l.locationtoindex(evt.getpoint()));         system.out.println(evt.getcomponent());         l.setcomponentpopupmenu(p.menu_categoria);         p.menu_categoria.show(evt.getcomponent(), evt.getx(), evt.gety());       }  } }    package view;  import javax.swing.*;  import java.awt.*;  public class ___poupupmenu___ {  public jpopupmenu menu_categoria = new jpopupmenu(); public jpopupmenu menu_scuola = new jpopupmenu(); public jpopupmenu menu_maschile_femminile = new jpopupmenu(); public jpopupmenu menu_dirigenti_allenatori = new jpopupmenu(); public jpopupmenu menu_img_profilo = new jpopupmenu();  jmenuitem menu_elimina = new jmenuitem("elimina"); jmenuitem menu_modifica = new jmenuitem("modifica"); jmenuitem menu_apri = new jmenuitem("apri...");     jmenuitem menu_pagamento = new jmenuitem("visualizza pagamenti"); jmenuitem menu_genitore = new jmenuitem("visualizza genitore"); jmenuitem menu_visita_medica = new jmenuitem("visualizza scadenza visita medica");    public ___poupupmenu___ ()   {        menu_elimina.setfont(new font("segoe ui", 1, 15));         menu_modifica.setfont(new font("segoe ui", 1, 15));         menu_apri.setfont(new font("segoe ui", 1, 15));         menu_pagamento.setfont(new font("segoe ui", 1, 15));          menu_genitore.setfont(new font("segoe ui", 1, 15));          menu_categoria.add(menu_modifica);        menu_categoria.add(menu_elimina);         menu_scuola.add(menu_apri);        menu_scuola.add(menu_visita_medica);        menu_scuola.add(menu_genitore);        menu_scuola.add(menu_pagamento);        menu_scuola.add(menu_modifica);        menu_scuola.add(menu_pagamento);         menu_maschile_femminile.add(menu_apri);        menu_maschile_femminile.add(menu_visita_medica);        menu_maschile_femminile.add(menu_modifica);        menu_maschile_femminile.add(menu_elimina);         menu_dirigenti_allenatori.add(menu_apri);        menu_dirigenti_allenatori.add(menu_modifica);        menu_dirigenti_allenatori.add(menu_elimina);     }  }   package controller;  import javax.swing.*;  import mouselistener.add_popupmenu_categoria;  public class categoriacontroller  {     public void add_popupmenu_categoria (jlist <string> l)    {       add_popupmenu_categoria apmc = new add_popupmenu_categoria (l);       l.addmouselistener(apmc);    } } 

when click is:

pressed released enter in released javax.swing.jlist[,0,0,897x797,alignmentx=0.0,alignmenty=0.0,border=,flags=50331944,maximumsize=,minimumsize=,preferredsize=,fixedcellheight=-1,fixedcellwidth=-1,horizontalscrollincrement=-1,selectionbackground=javax.swing.plaf.coloruiresource[r=184,g=207,b=229],selectionforeground=sun.swing.printcoloruiresource[r=51,g=51,b=51],visiblerowcount=8,layoutorientation=0] clicked

someone can me?

edit: simplest way use setcomponentpopupmenu method of jlist:

jpopupmenu popup = new jpopupmenu(); popup.add(new jmenuitem("hello world"));  jlist<string> jlist = new jlist<string>(); jlist.setcomponentpopupmenu(popup); 

setcomponentpopupmenu(popup) appends popup component. show automatically if right-click component. no mouselistener needed.

another easy way implement popup-menus swing components override getcomponentpopupmenu() method of jcomponent. solution this:

public class myjlistwithpopupmenu extends jlist {     //...     @override     public jpopupmenu getcomponentpopupmenu() {         // create popupmenu         return myjpopupmenu;     }     //... } 

when use myjlistwithpopupmenu instead of regular jlist, popup wil show in right place when right-click on it.