好的，所以我有一个Java程序，可以查看售出的票数和茶点数量的销售报告。我已完成该计划。它有两个文件：TheaterSales.java文件和GUI驱动程序类。 在该程序中，用户输入销售的每个项目的数量，然后程序确定每个项目的销售额和所有项目的总销售额。确定这一点的方法是用户输入每件商品的编号，然后按“计算销售总额”按钮。 当我输入每个售出商品的数量时，销售额和总成本都为零。 什么可能是我没有看到的错误或可能丢失的代码。
//Worker Class
public class TheaterSales_1 {
//Create instance variable for adult tickets, child tickets, popcorn and drinks
private double adultTickets;
private double childTickets;
private double popcorn;
private double drinks;
//Getters and setters for each instance variable
public double getAdultTickets() {
return adultTickets;
}
public void setAdultTickets(double adultTickets) {
this.adultTickets = adultTickets;
}
public double getChildTickets() {
return childTickets;
}
public void setChildTickets(double childTickets) {
this.childTickets = childTickets;
}
public double getPopcorn() {
return popcorn;
}
public void setPopcorn(double popcorn) {
this.popcorn = popcorn;
}
public double getDrinks() {
return drinks;
}
public void setDrinks(double drinks) {
this.drinks = drinks;
}
//Constants for the cost of the tickets and refreshments
final double adult = 9.50;
final double child = 5.75;
final double food = 5.50;
final double beverage = 3.25;
//Two constructors, one must be a default constructor
public TheaterSales_1(){
adultTickets = 0;
childTickets = 0;
popcorn = 0;
drinks = 0;
}
public TheaterSales_1(double adultTickets, double childTickets,
double popcorn, double drinks ){
setAdultTickets(adultTickets);
setChildTickets(childTickets);
setPopcorn(popcorn);
setDrinks(drinks);
}
//Methods to calculate and return sales for adult tickets, child tickets, popcorn,
drinks and the total sales
public double getAdultTicketSales()
{
return adultTickets*adult;
}
public double getChildTicketSales()
{
return childTickets*child;
}
public double getPopcornSales()
{
return popcorn*food;
}
public double getDrinkSales()
{
return drinks*beverage;
}
public double getTotalSales()
{
return getAdultTicketSales() + getChildTicketSales() + getPopcornSales()+
getDrinkSales();
}
public String toString(){
String str = "ACME Theater\n\n"; //Title of the Panel
str += "Adult Tickets " + String.format("$%,.2f", adult);
str += "Child Tickets " + String.format("$%,.2f", child);
str += "Popcorn " + String.format("$%,.2f", popcorn);
str += "Drinks " + String.format("$%,.2f", drinks);
str += "Total Sales " + String.format("$%,.2f", getTotalSales());
return str;
}
}
//GUI Driver Class
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class G_Driver extends JFrame {
private JPanel northPanel;
private JPanel southPanel;
private JPanel eastPanel;
private JPanel westPanel;
private JLabel nLabel;
private JLabel sLabel;
private JLabel totSales;
private JLabel adTickets;
private JLabel chTickets;
private JLabel popCorn;
private JLabel drinkS;
private JTextField adTicketsTxt;
private JTextField chTicketsTxt;
private JTextField popcornTxt;
private JTextField drinksTxt;
private JTextField TotalSalesTxt;
private JButton calcSalesButton;
private JButton closeButton;
private TheaterSales_1 TS;
final int WINDOW_WIDTH = 600;
final int WINDOW_HEIGHT = 600;
/**
*
* Constructor
*/
public G_Driver(){
setTitle("ACME Theater Sales Report");
setSize(WINDOW_WIDTH, WINDOW_HEIGHT);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new BorderLayout());
//Calling the methods for the three regions of the window
topPanel();
centerPanel();
bottomPanel();
setVisible(true);
}
//Writing the top Panel private method
private void topPanel(){
northPanel = new JPanel();
nLabel = new JLabel("ACME Theater");
northPanel.add(nLabel);
add(northPanel, BorderLayout.NORTH);
}
//Writing the center Panel private method
private void centerPanel(){
eastPanel = new JPanel(new GridLayout(3,4));
JPanel quantity = new JPanel(new GridLayout(4,2));
adTickets = new JLabel("Adult Tickets");
adTicketsTxt = new JTextField(3);
chTickets = new JLabel("Child Tickets");
chTicketsTxt = new JTextField(3);
popCorn = new JLabel("Popcorn");
popcornTxt = new JTextField(3);
drinkS = new JLabel("Drinks");
drinksTxt = new JTextField(3);
quantity.setBorder(BorderFactory.createTitledBorder("Quantity"));
quantity.add(adTickets);
quantity.add(adTicketsTxt);
quantity.add(chTickets);
quantity.add(chTicketsTxt);
quantity.add(popCorn);
quantity.add(popcornTxt);
quantity.add(drinkS);
quantity.add(drinksTxt);
eastPanel.add(quantity);
JPanel sales = new JPanel(new GridLayout(5,2));
adTickets = new JLabel("Adult Tickets");
adTicketsTxt = new JTextField(3);
adTicketsTxt.setEditable(false);
chTickets = new JLabel("Child Tickets");
chTicketsTxt = new JTextField(3);
chTicketsTxt.setEditable(false);
popCorn = new JLabel("Popcorn");
popcornTxt = new JTextField(3);
popcornTxt.setEditable(false);
drinkS = new JLabel("Drinks");
drinksTxt = new JTextField(3);
drinksTxt.setEditable(false);
//Create a border title
sales.setBorder(BorderFactory.createTitledBorder("Sales"));
sales.add(adTickets);
sales.add(adTicketsTxt);
sales.add(chTickets);
sales.add(chTicketsTxt);
sales.add(popCorn);
sales.add(popcornTxt);
sales.add(drinkS);
sales.add(drinksTxt);
eastPanel.add(sales);
add(eastPanel, BorderLayout.CENTER);
}
//Writing a private bottom method
private void bottomPanel(){
southPanel = new JPanel();
totSales = new JLabel("Total Sales:");
TotalSalesTxt = new JTextField(10);
TotalSalesTxt.setEditable(false);
calcSalesButton = new JButton("Calculate Sales Total");
calcSalesButton.addActionListener(new CalcSalesButtonListener());
closeButton = new JButton("Close");
closeButton.addActionListener(new CloseButtonListener());
southPanel.add(totSales);
southPanel.add(TotalSalesTxt);
southPanel.add(calcSalesButton);
southPanel.add(closeButton);
add(southPanel, BorderLayout.SOUTH);
}
//Action Events will handle the calculate button and quantity input
private class CalcSalesButtonListener implements ActionListener{
public void actionPerformed(ActionEvent e){
TS = new TheaterSales_1();
adTicketsTxt.setText(String.format("$%,.2f",
TS.getAdultTicketSales()));
chTicketsTxt.setText(String.format("$%,.2f",
TS.getChildTicketSales()));
popcornTxt.setText(String.format("$%,.2f", TS.getPopcornSales()));
drinksTxt.setText(String.format("$%,.2f", TS.getDrinkSales()));
TotalSalesTxt.setText(String.format("$%,.2f", TS.getTotalSales()));
}
}
private class CloseButtonListener implements ActionListener{
public void actionPerformed(ActionEvent e){
if(e.getSource() == closeButton){
System.exit(0);
}
}
}
//Run the GUI program
public static void main(String[] args){
new G_Driver();
}
}
答案 0 :(得分：3)
按钮的监听器
TS = new TheaterSales_1();
然后从这个新的TheaterSales_1实例中获取值。而TheaterSales_1的构造函数确实
public TheaterSales_1(){
adultTickets = 0;
childTickets = 0;
popcorn = 0;
drinks = 0;
}
所以我们很期待一切都是0。