java - JFrame and ItemListener Issues -

-

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


Comments

Post a Comment

Popular posts from this blog

node.js - Mongoose: Cast to ObjectId failed for value on newly created object after setting the value -

-
this question has answer here: what's mongoose error cast objectid failed value xxx @ path “_id”? 7 answers even though has been asked many times because entity has no valid objectid field. i came across situation objectid set value can casted objectid still error. the schema: var serviceschema = parammongoose.schema({ servicename:{ type: parammongoose.schema.types.objectid , ref: 'servicenames',required:true } }); pseudo code: servicefromdb=new service({servicename:'some name'}); servicefromdb.servicename='000000000000000000000001'; servicefromdb.save(function(paramerror,paramdata){ if(paramerror){ console.log('but but...',servicefromdb,paramerror) } }); the output of code is: but but... { servicename: 000000000000000000000001, _id: 55079a90286f49280364f78b } { [casterror: cast objectid faile...
Read more

how does one get csharp-sqlite to throw exceptions for duplicates or foreign key constraint violations -

-
i making use of csharp-sqlite. in sqlite database have uniqueness , foreign key constraints. when write "duplicate" table exception not raised , way found check exception use following: var error = sqlitecommand.getlasterror(); i hoping able following: var sqlstring = "some insert sql"; var command = sqlitecommand(sqlstring); command.parameters.add(... parameter...); using (var sqlconnection = new sqliteconnection(connectionstring)) { try { command.executenonquery(); } catch (exception ex) { exception } { sqlconnection.close(); } } the "catch" block never hit, though var error = sqlitecommand.getlasterror(); does return description of error expecting. have idea how solve this, or standard practice using csharp-sqlite library?
Read more

Simple Angular 2 project fails 'Unexpected reserved word' -

-
i trying create simple angular2 project based on ng2do project. using quickstart , have following code... <script src="js/quickstart/dist/es6-shim.js"></script> .... import {component, template, bootstrap, foreach} 'js/quickstart/angular2/angular2'; this gives me following error... uncaught syntaxerror: unexpected reserved word what missing? don't know if helps have been having issues day realised because starting code script reference <script src="app.js"> </script> instead of using <script> system.import('app'); </script> hope helps using in tsconfig { "version": "1.5.0-beta", "compileroptions": { "target": "es6", "module": "amd", "declaration": false, "noimplicitany": false, "removecomments": true, "nolib": fal...
Read more