java - JFrame and ItemListener Issues -

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i cannot figure out debug class.

as comments say, needs have user enter pizza toppings , gives price back. has code have no clue start on debug.

anything help, or if have working code help. want learn need help. thank in advance help/nudge in right direction.

// debugfourteen3 // user selects pizza topping , sees price import javax.swing.*; import java.awt.*; import java.awt.event.*;  //use correct spelling of class name public class debugfourteen3 extends jframe implements itemlistener {    flowlayout flow = new flowlayout();    jcombobox pizzabox = new jcombobox();    jlabel toppinglist = new jlabel("topping list");    jlabel alabel = new jlabel("paulos's american pie");    jtextfield totprice = new jtextfield(10);    int[] pizzaprice = {7,10,10,8,8,8,8};    int totalprice = 0;    string output;    int pizzanum;    public debugfourteen3()    {       super("pizza list");       setdefaultcloseoperation(jframe.exit_on_close);       setlayout(flow);       pizzabox.additemlistener(this);       add(toppinglist);       pizzabox.additem("cheese");       pizzabox.additem("sausage");       pizzabox.additem("pepperoni");       pizzabox.additem("onion");       pizzabox.additem("green pepper");       pizzabox.additem("green olive");       pizzabox.additem("black olive");       add(pizzabox);       add(alabel);       add(totalprice);    }    public static void main(string[] arguments)    {       jframe frame = new debugfourteen3();       frame.setsize(200, 150);       frame.setvisible(true);    }     public void itemstatechanged(itemevent[] list)    {       object source = list.getsource();       if(source == pizzabox)       {          int pizzanum = pizzabox.getselectedindex();          totalprice = pizzaprice[x];          output = "pizza price $" + totalprice;          totprice.settext(output);       }    } }

  • add(totalprice); int, can not added container. use jlabel, jtextfield or jformattedtextfield instead
  • public void itemstatechanged(itemevent[] list) { not valid signature contractual requirements of itemlistener. see javadocs requirement method signature honor contractual requirements, take care of @ least 2 other errors
  • totalprice = pizzaprice[x];, x undefined (or more point, defined private variable in component , can reference it, think want pizzanum

personally, think find easier use actionlistener instead of itemlistener care change in selected item, not change old selected item new selected item


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