大家好，有人可以帮我完成我的程序吗？我有一个 JComboBox，里面有几个项目。我想要发生的是，每当用户单击组合框中的某个项目时，它应该显示其项目数量。例如，我点击 PM1 两次它应该显示数量为 2，如果我点击 PM4 五次它应该显示数量为 5。我的程序中有两个类，代码如下。顺便说一句，我还想在 CopyShowOrder 类中显示的项目旁边显示数量。任何帮助将不胜感激提前感谢和更多的力量！
CopyShow的代码：
import java.util.Scanner;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class CopyShow{
private static String z = "";
private static String w = "";
private static String x = "";
JComboBox combo;
private static String a = "";
public CopyShow(){
String mgaPagkainTo[] = {"PM1 (Paa/ Spicy Paa with Thigh part)","PM2 (Pecho)","PM3 (Pork Barbeque 4 pcs.)","PM4 (Bangus Sisig)","PM5 (Pork Sisig)","PM6 (Bangus Inihaw)","SM1 (Paa)","SM2 (Pork Barbeque 2 pcs.)","Pancit Bihon","Dinuguan at Puto","Puto","Ensaladang Talong","Softdrinks","Iced Tea","Halo-Halo","Leche Flan","Turon Split"};
JFrame frame = new JFrame("Mang Inasal Ordering System");
JPanel panel = new JPanel();
combo = new JComboBox(mgaPagkainTo);
combo.setBackground(Color.gray);
combo.setForeground(Color.red);
panel.add(combo);
frame.add(panel);
combo.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
String str = (String)combo.getSelectedItem();
a = str;
CopyShowOrder messageOrder1 = new CopyShowOrder();
messageOrder1.ShowOrderPo();
}
});
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(300,250);
frame.setVisible(true);
}
public static void main(String[] args) {
Scanner inp = new Scanner(System.in);
boolean ulitinMoPows = true;
boolean tryAgain = true;
System.out.print("\nInput Customer Name: ");
String customerName = inp.nextLine();
w = customerName;
System.out.print("\nInput Cashier Name: ");
String user = inp.nextLine();
z = user;
do{
System.out.print("\nInput either Dine In or Take Out: ");
String dInDOut = inp.nextLine();
x = dInDOut;
if (x.equals("Dine In") || x.equals("Take Out")){
System.out.print("");
ulitinMoPows = false;
}
else{
JOptionPane.showMessageDialog(null, "Try again! Please input Dine In or Take Out only!","Error", JOptionPane.ERROR_MESSAGE);
ulitinMoPows = true;
System.out.print ("\f");
}
}while(ulitinMoPows);
do{
System.out.print("\nInput password: ");
String pass = inp.nextLine();
if(pass.equals("admin")){
CopyShowOrder messageShowMenu = new CopyShowOrder();
messageShowMenu.ShowMo();
tryAgain = false;
}
if(!pass.equals("admin")){
JOptionPane.showMessageDialog(null, "Try again! Invalid password!","Error Logging-In", JOptionPane.ERROR_MESSAGE);
tryAgain = true;
System.out.print ("\f");
}
}while(tryAgain);
CopyShow j = new CopyShow();
}
public static String kuhaOrder()
{
return a;
}
public static String kuhaUserName()
{
return z;
}
public static String kuhaCustomerName()
{
return w;
}
public static String kuhaSanKainPagkain()
{
return x;
}
}
CopyShowOrder 的代码：
public class CopyShowOrder {
public void ShowMo(){
String user = CopyShow.kuhaUserName();
System.out.print("\n\n\t\tCashier: " +user);
String dInDOut = CopyShow.kuhaSanKainPagkain();
System.out.print(" "+dInDOut);
String customerName = CopyShow.kuhaCustomerName();
System.out.print("\n\t\tCustomer Name: " +customerName);
}
public void ShowOrderPo() {
String order = CopyShow.kuhaOrder();
System.out.print("\t\t\t\t\n " +order);
}
}