java - JList doesn't display new added element from my combobox -

i created combobox elements defaultlistmodel in class. however, when ever click item combobox doesn't add item elements jlist.

you adding mouselistener jlist. expecting when item selected combobox fire actionperformed.

however, when ever click item combobox doesn't add item elements jlist

the code adding mouselistener jlist:

courselist = new jlist(list);    courselist.addmouselistener(new mouseadapter() {     @override     public void mouseclicked(mouseevent arg0) {         string selectedvalue = (string) mealscombo.getselecteditem();         if(selectedvalue.equals("main")){             list.addelement("main");         }     } }); 

so add mouse listener combobox. actionlistener or itemlistener better.