Java writing online supermarket shopping settlement function program _java

Use the Java language to write a simulation of the online supermarket shopping settlement function of the program, requires the program to run a graphical user interface, for users to enter the purchase of various goods related information, and finally give the user's shopping list and the total price.
Requirements Analysis:
1. Administrator to add goods and their price
2. User Purchase goods print order information and settle order
Code:

* * Creator: Zhangjunqiang * Time: 2016/5/15 * */package Salesys; 
Import java.awt.*; 
Import java.awt.event.*; 
 
Import Java.util.Vector; 
 
Import javax.swing.*; 
 
Import java.sql.*; 
 Class goods{public string[] name; 
 Public float[] Price; 
  Goods () {name =new string[100]; 
 Price=new float[100]; } public class supermarket extends jframe{public static void Main (string[] args) throws sqlexception{Mainwinow   
  Mainwin=new Mainwinow ("Online supermarket shopping settlement"); 
  Mainwin.setdefaultcloseoperation (Jframe.exit_on_close); 
  Mainwin.setbounds (300, 300, 500, 400); 
  Mainwin.setvisible (TRUE); 
  Mainwin.setwin (Mainwin); 
 Mainwin.setminwindowlayout (); 
 } class Mainwinow extends jframe{goods goods; 
 Private JButton user; 
 Private JButton Manager; 
 Private JLabel Loginlabel; 
 Private Managewindow Magwin; 
 Private Userwindow Userwin; 
 Private Listener lis; 
 Private Mainwinow Loginwin; 
 private int goodsnum; 
 * * Settings interface */private JLabel Setnamelabel; Private JlabeL Setpricelabel; 
 Private JTextField Setnametext; 
 Private JTextField Setpricetext; 
 Private JButton inputbut; 
 Private TextArea Inputarea; 
 Private JButton returnBut1; 
 Private JButton cancelbut; 
 /* User Interface * */private vector<string> Buyitem; 
 Private float[] Buycount; 
 private int buynum; 
 Private JComboBox Goodscombox; 
 Private JButton ReturnBut2; 
 Private JLabel Choicegoodlabel; 
 Private JLabel Showpricelabel; 
 Private JTextField Showprice; 
 Private TextArea Showchoice; 
 Private JLabel Showbuynum; 
 Private JTextField Showbuynumtext; 
 Private JButton submitbuy; 
 Private JButton deletebuybut; 
 Private JList choicelist; 
 Private JButton countbut; 
 Private Float Summoney; 
 /** * Database Import * * * Statement stmt; 
  Mainwinow (String winname) throws sqlexception{super (Winname); 
  goodsnum=0; 
  buynum=0; 
  summoney= (float) 0; 
  Goods=new goods (); 
  User=new JButton ("I am a user"); 
  Manager=new JButton ("I am an administrator"); 
  Loginlabel=new JLabel ("Please select role!"); MAgwin=new Managewindow ("Set up Commodity"); 
  Magwin.setbounds (300, 300, 500, 400); 
  Magwin.setdefaultcloseoperation (Do_nothing_on_close); 
  Userwin=new Userwindow ("Welcome to buy"); 
  Userwin.setbounds (300, 300, 500, 400); 
  Userwin.setdefaultcloseoperation (Do_nothing_on_close); 
  Lis=new Listener (); 
  * * SET INTERFACE Initialization * * * * * * * setnamelabel=new JLabel ("Product Name:"); 
  Setpricelabel=new JLabel ("Price:"); 
  Setnametext=new JTextField (5); 
  Setpricetext=new JTextField (5); 
  Inputbut=new JButton ("confirm add"); 
  Inputarea=new TextArea (); 
  Returnbut1=new JButton ("return"); 
  Cancelbut=new JButton ("recall add"); 
  /* User Interface Initialization * */goodscombox=new JComboBox (); 
  Returnbut2=new JButton ("return"); 
  Choicegoodlabel=new JLabel ("Please select Product:"); 
  Showpricelabel=new JLabel ("price"); 
  Showprice=new JTextField (5); 
  Showchoice=new TextArea (); 
  Showbuynum=new JLabel ("Purchase quantity:"); 
  Showbuynumtext=new JTextField (5); 
  Submitbuy=new JButton ("Confirm purchase"); 
  Deletebuybut=new JButton ("delete order"); 
  Countbut=new JButton ("Order settlement"); ChoicElist=new JList (); 
  Buyitem=new vector<string> (); 
  Buycount=new float[100]; 
  * * * Import * * * */try {class.forname ("com.mysql.jdbc.Driver"); 
  catch (ClassNotFoundException e) {//TODO auto-generated catch block E.printstacktrace (); 
  } String url= "Jdbc:mysql://localhost:3306/device"; 
  String user= "root"; 
  String password= "zjq1314520"; 
  Connection con=drivermanager.getconnection (Url,user,password); 
  stmt = Con.createstatement (); 
 * * * Database Data export */Importsql (); 
  The public void Importsql () throws SQLException {int i=1;  
  TODO auto-generated Method Stub ResultSet result=stmt.executequery ("Select Name,price from Goods_info"); 
   while (Result.next ()) {goods.name[i-1]=result.getstring (1); 
   Goods.price[i-1]=float.parsefloat (result.getstring (2)); 
  i++; 
 } goodsnum=i-1; 
 public void Setwin (Mainwinow w) {loginwin=w; public void Setminwindowlayout () {Container logincon=new ConTainer (); 
  Logincon.setlayout (New FlowLayout ()); 
  Logincon.add (manager); 
   
  Logincon.add (user); 
  Manager.addactionlistener (LIS); 
  User.addactionlistener (LIS); 
  This.setlayout (New BorderLayout ()); 
  This.add (Loginlabel,borderlayout.north); 
  This.add (Logincon,borderlayout.center); 
  This.validate (); 
  * * SET Interface layout * */magwin.setlayout (new FlowLayout ()); 
  Magwin.add (Setnamelabel); 
  Magwin.add (Setnametext); 
  Magwin.add (Setpricelabel); 
  Magwin.add (Setpricetext); 
  Magwin.add (inputbut); 
  Magwin.add (Inputarea); 
  Magwin.add (cancelbut); 
   
  Magwin.add (RETURNBUT1); 
  Inputbut.addactionlistener (LIS); 
  Returnbut1.addactionlistener (LIS); 
  Cancelbut.addactionlistener (LIS); 
  /* User Interface Layout * */userwin.setlayout (new BorderLayout ()); 
  Container usercon=new Container (); 
  Usercon.setlayout (New FlowLayout ()); 
  Usercon.add (Choicegoodlabel); 
  Usercon.add (Goodscombox); 
  Usercon.add (Showpricelabel); 
  Usercon.add (Showprice); Usercon.add (SHowbuynum); 
  Usercon.add (Showbuynumtext); 
  Usercon.add (submitbuy); 
  Userwin.add (Usercon,borderlayout.north); 
  Choicelist.setlistdata (Goods.name); 
  Userwin.add (Choicelist,borderlayout.center); 
   
  Userwin.add (New JScrollPane (choicelist)); 
  Container butcon=new Container (); 
  Butcon.setlayout (New FlowLayout ()); 
  Butcon.add (deletebuybut); 
  Butcon.add (countbut); 
  Butcon.add (RETURNBUT2); 
   
  Userwin.add (Butcon,borderlayout.south); Goodscombox.additemlistener (New ItemListener () {@Override public void itemstatechanged (ItemEvent e) {/ 
    /TODO auto-generated Method Stub int I=goodscombox.getselectedindex (); 
   if (i>=0) Showprice.settext (goods.price[i].tostring ()); 
  } 
  } 
  ); 
  Returnbut2.addactionlistener (LIS); 
  Submitbuy.addactionlistener (LIS); 
  Deletebuybut.addactionlistener (LIS); 
 Countbut.addactionlistener (LIS); private void Addcomboxitem () {//TODO auto-generated method stub for (int i=0;i<goodsnum;i++){Goodscombox.additem (goods.name[i]); Class Listener implements actionlistener{@Override public void actionperformed (ActionEvent e) {// 
    TODO auto-generated Method Stub if (E.getsource () ==manager) {addgoods (); 
    Loginwin.setvisible (FALSE); 
   Magwin.setvisible (TRUE); 
    } if (E.getsource () ==user) {loginwin.setvisible (false); 
    Userwin.setvisible (TRUE); 
    Goodscombox.removeallitems (); 
   Addcomboxitem (); 
     
    } if (E.getsource () ==inputbut) {//string showout= ""; if (Setnametext.gettext (). Equals ("") | | Setpricetext.gettext (). Equals ("")) {Joptionpane.showmessagedialog (Magwin, "No free items!", "Warning", Joptionpane.plain_ 
    message); 
     } else{Goods.name[goodsnum]=setnametext.gettext (); 
     Goods.price[goodsnum]=float.parsefloat (Setpricetext.gettext ()); try {* * * is written to the database */stmt.executeupdate (INSERT into Goods_info (Name,price) VALUES (' +goods. name[goodsnum]+ "', '" + (float) goods.price[goodsnum]+ "')"); 
     catch (SQLException E1) {//TODO auto-generated catch block E1.printstacktrace (); 
     } goodsnum++; 
     Addgoods (); 
     Setnametext.settext (""); 
     Setpricetext.settext (""); 
     showout= "Product Name:" +setnametext.gettext () + "T" + "Price:" +setpricetext.gettext () + "\ n"; 
    Inputarea.append (showout); 
     } if (E.getsource () ==cancelbut) {if (goodsnum>0) {goodsnum--; 
     String Deletename=goods.name[goodsnum]; 
     String deleteprice=goods.price[goodsnum].tostring (); 
     System.out.println (Deletename); * * Delete the elements inside the database */String sql = "Delete from Goods_info where name = ' +deletename+" ' and Price = ' "+ 
     Deleteprice+ "'"; 
     try {stmt.executeupdate (SQL); 
     catch (SQLException E1) {//TODO auto-generated catch block E1.printstacktrace (); 
     }//connection con= Dbmanager. getconnection ();; PreparedStatement PS = con.preparestatement (SQL); 
    Addgoods (); 
    } if (E.getsource () ==returnbut1) {loginwin.setvisible (true); 
   Magwin.setvisible (FALSE); 
    }/* User Interface Event Response */if (E.getsource () ==returnbut2) {loginwin.setvisible (true); 
   Userwin.setvisible (FALSE); } if (E.getsource () ==submitbuy) {if (!showbuynumtext.gettext (). Equals (")) {Buycount[goodscombox.getselecte 
     Dindex ()]=float.parsefloat (Showbuynumtext.gettext ()); 
     String contentitem= ""; 
     Float Summon=float.parsefloat (Showbuynumtext.gettext ()) * (float) goods.price[goodscombox.getselectedindex ()]; contentitem= "Product Name:" +goods.name[goodscombox.getselectedindex ()]+ "" + "unit Price:" +goods.price[ Goodscombox.getselectedindex ()].tostring () + "" + "Purchase Quantity:" +showbuynumtext.gettext () + "" + "Total Price:" +summon.tostring ( 
     ); 
     Buyitem.addelement (ContentItem); 
     Buyitem[buynum]=contentitem; 
     buynum++; 
     Choicelist.removeall (); 
     Choicelist.setlistdata (Buyitem); Summoney+=summon; 
    else{Joptionpane.showmessagedialog (Magwin, "Purchase quantity can not be empty", "warning", joptionpane.plain_message); } if (E.getsource () ==deletebuybut) {if (Choicelist.getselectedvalue () ==null) {Joptionpane.showmes     
    Sagedialog (Magwin, "items not selected for deletion", "warning", joptionpane.plain_message); 
     else if (buynum>0) {int i=choicelist.getselectedindex (); 
     String Selectitem=buyitem.get (i); 
     System.out.println (SelectItem); 
     String deleteprice= ""; 
      for (int j=0;j<selectitem.length () -3;j++) {//System.out.println (Selectitem.substring (J, j+3)); 
       if (Selectitem.substring (J, j+3). Equals ("Total Price:")) {deleteprice=selectitem.substring (J+3,selectitem.length ()); 
       System.out.println (Deleteprice); 
       Summoney-=float.parsefloat (Deleteprice); 
      Break 
     } buyitem.remove (i); 
     Choicelist.removeall (); 
     Choicelist.setlistdata (Buyitem); 
     Choicelist.validate (); 
    buynum--; } else{ 
     Joptionpane.showmessagedialog (Magwin, "Shopping cart is empty, can not be deleted", "Warning", joptionpane.plain_message); } if (E.getsource () ==countbut) {//summoney for (int i=0;i<buyitem.size (); i++) {String str=buyitem.get 
     (i). substring (0, 2); 
     if (str.equals ("Total Price")) {buyitem.remove (i); 
    } buyitem.addelement ("Total Price:" +summoney.tostring ()); 
    Choicelist.removeall (); 
    Choicelist.setlistdata (Buyitem); 
   Choicelist.validate (); 
   The private void Addgoods () {if (!inputarea.gettext (). Equals (")") Inputarea.settext (""); TODO auto-generated method stub for (int i=0;i<goodsnum;i++) {String massage= ' product name: ' +goods.name[i]+ ' \ t ' + ' Price: ' 
    +goods.price[i].tostring () + "\ n"; 
   Inputarea.append (massage); 
 Class Managewindow extends JFrame {Managewindow (String title) {Super (title); 
 } class Userwindow extends jframe{Userwindow (String title) {Super (title);  } 
}

Delete the relevant Database section can be run on your own computer!

For screenshots:

Administrator interface:

User interface:

The above is the entire content of this article, I hope to help you learn, but also hope that we support the cloud habitat community.