swing - Java GUI adding a JList to class in another file -

i'm trying call jlist have in 1 class , add no avail, it's telling me static , non static functions

i've got arraylist called finallist in 1 class, filled values, , has been checked printing list out.

then have class in different file called cupboard, want put items jlist there.

    finallist.add(si); 

is items being added, si array items, , finallist new array in cupboard class file, have

    public cupboard()  {     cupboardcontent = new jlist(shoppinglist.finallist.toarray()); } 

where cupboardcontent new jlist want items go.

thanks if has idea. i'm sure it's straightforward, , i'm being quite stupid! it'd seem when combining normal processes gui, i'm fairy new working gui i'm struggling make connections!

//edit

right, first bit of code adding items array absolutely fine, need work out how call in new class. currently, have

    public class kitchencupboard extends jpanel //implements actionlistener     { private jlist cupboardcontent; private jbutton useditem;  shoppinglist items = new shoppinglist();  public kitchencupboard()  {     system.out.println(shoppinglist.finallist);      cupboardcontent = new jlist(items.finallist.toarray());     cupboardcontent.setvisiblerowcount(10);     cupboardcontent.setfixedcellheight(30);     cupboardcontent.setfixedcellwidth(200);     cupboardcontent.setfont(new font ("sansserif", font.bold, 13));     cupboardcontent.setselectionmode(listselectionmodel.multiple_interval_selection);     add(new jscrollpane(cupboardcontent)); } 

}

the array in shoppinglist is

    static arraylist<shoppingitem> finallist = new arraylist<shoppingitem>(); 

it's using 2 classes/files: shoppinglist.java , kitchencupboard.java

because finallist member of shoppinglist, can 1 of 2 things. either:

declare finallist static member of shoppinglist, allowing access have above:

cupboardcontent = new jlist(shoppinglist.finallist.toarray()); 

or pass reference shoppinglist object constructor of cupboard allowing access finallist through reference:

public cupboard(shoppinglist list)  {     cupboardcontent = new jlist(list.finallist.toarray()); } 

and create new cupboard:

cupboard c = new cupboard(<some shoppinglist instance>); 

can suggest cast generated array type need, java 7 introduces new generics based swing components, array of whatever in finallist more useful.