大家好，有人请帮我解决我的计划吗？我有一个JComboBox，里面有几个项目。我想要发生的是，每当用户点击组合框内的某个项目时，它应该显示其项目数量。例如，我点击PM1两次它应该显示2个数量，如果我点击PM4五次然后它应该显示数量5。我的课程涉及两个课程，代码如下。顺便说一句，我还想显示类CopyShowOrder中显示的项目旁边的数量。任何帮助将非常感谢提前感谢和更多的力量！
CopyShow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);
}
}
答案 0 :(得分：1)
我不确定这是不是你想要的东西，但是它在这里...... 你可以有个想法..
import java.awt.BorderLayout;
public class StackOverflow extends JDialog {
private final JPanel contentPanel = new JPanel();
private JTable table;
private JComboBox comboBox = new JComboBox();
private JButton button = new JButton("+");
private JButton button_1 = new JButton("-");
private JScrollPane scrollPane = new JScrollPane();
private List<String> list = new ArrayList<String>();
/**
* Launch the application.
*/
public static void main(String[] args) {
try {
StackOverflow dialog = new StackOverflow();
dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
dialog.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* Create the dialog.
*/
public StackOverflow() {
setTitle("StackOverflow");
setBounds(100, 100, 339, 228);
comboBox.setModel(new DefaultComboBoxModel(new String[] {"ITEM 1", "ITEM 2", "ITEM 3", "ITEM 4", "ITEM 5", "ITEM 6"}));
getContentPane().setLayout(new BorderLayout());
contentPanel.setBorder(new EmptyBorder(5, 5, 5, 5));
getContentPane().add(contentPanel, BorderLayout.CENTER);
contentPanel.setLayout(null);
{
scrollPane.setBounds(10, 43, 303, 131);
contentPanel.add(scrollPane);
{
table = new JTable();
table.setModel(new DefaultTableModel(
new Object[][] {
},
new String[] {
"Item", "Count"
}
));
scrollPane.setViewportView(table);
}
}
//Gets the table model and clear it
DefaultTableModel model = (DefaultTableModel) table.getModel();
model.setRowCount(0);
//Add comboBox items to table
for (int i = 0; i < comboBox.getItemCount(); i++)
model.addRow(new Object[] { comboBox.getItemAt(i) , 0 });
comboBox.setBounds(10, 12, 203, 20);
contentPanel.add(comboBox);
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String selectedItem = (String) comboBox.getSelectedItem();
for (int i = 0; i < table.getRowCount(); i++) {
String tableItem = (String) table.getValueAt(i, 0);
int count = (Integer) table.getValueAt(i, 1)+1;
if (selectedItem.equals(tableItem)) {
table.setValueAt(count, i, 1);
}
}
}
});
button.setBounds(223, 11, 41, 23);
contentPanel.add(button);
button_1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String selectedItem = (String) comboBox.getSelectedItem();
for (int i = 0; i < table.getRowCount(); i++) {
String tableItem = (String) table.getValueAt(i, 0);
int count = (Integer) table.getValueAt(i, 1)-1;
if (selectedItem.equals(tableItem)) {
table.setValueAt(count, i, 1);
}
}
}
});
button_1.setBounds(272, 11, 41, 23);
contentPanel.add(button_1);
}
}