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我有一个半完整的编码，基本上归结为一个 gui 界面。问题是我不知道如何让它像售票机一样工作，固定费率和固定数量的现金能够投入。

所以，到目前为止，我已经完成了计算总金额的计算，无论我做什么，它总是以 0.00 英镑作为总金额的答案。

我迫切需要帮助。这非常令人沮丧。下面是 TicketCalculation 类的代码

import java.awt.*;
import java.text.*;
import java.awt.event.*;
import javax.swing.*;


public class TicketCalculation extends JFrame implements ActionListener {

    DecimalFormat pounds = new DecimalFormat("£#,##0.00");


    //creating and naming buttons and textfields
    private JButton twentypenceBtn = new JButton("20p");
    private JButton fiftypenceBtn = new JButton("50p");
    private JButton onepoundBtn = new JButton("£1");
    private JButton twopoundsBtn = new JButton("£2");
    private JButton fivepoundsBtn = new JButton("£5");
    private JButton tenpoundsBtn = new JButton("£10");
    private JButton twentypoundsBtn = new JButton("£20");
    private JButton C = new JButton("Calculate");

    private JButton frontBtn = new JButton("<<Front Stalls>>");
    private JButton private1Btn = new JButton("<<Private Box>>");
    private JButton middleBtn = new JButton("<<Middle Stalls>>");
    private JButton backBtn = new JButton("<<Back Stalls>>");
    private JButton calcBtn = new JButton("Calculate Bill");

    private JTextField tickettypeTxt = new JTextField(14);
    private JTextField stalltypeTxt = new JTextField(25);
    private JTextField amountticketsTxt = new JTextField(14);
    private JTextField totalamountTxt = new JTextField(10);
    private JTextField amountdueTxt = new JTextField(13);
    private JTextField amountpaidTxt = new JTextField(10);


    //creating labels
    private JLabel pickstall = new JLabel();
    private JLabel tictype = new JLabel ();
    private JLabel amontic = new JLabel();
    private JLabel ttamon = new JLabel();
    private JLabel amondue = new JLabel();
    private JLabel amonpaid = new JLabel();
    private JLabel label5 = new JLabel();
    private JLabel spacing6 = new JLabel();
    private JLabel spacing7 = new JLabel();
    private JLabel spacing8 = new JLabel();
    private JLabel spacing9 = new JLabel();
    private JLabel spacing10 = new JLabel();


    //image icon declarations
    private ImageIcon paycount = new ImageIcon(getClass().getResource("paycount.jpg"));

    double middleprice;
    double privateprice;
    double backprice;
    double frontprice;
    double type; 
    int number;

    public static void main(String[] args){
        new TicketCalculation();
    }


    public TicketCalculationt(){
        setLayout(new BorderLayout());
        setSize(650,750);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);



        //naming labels
        pickstall = new JLabel("==> Pick a Stall Type: ");
        tictype = new JLabel ("==> Price of a Ticket: £");
        amontic = new JLabel("==> Amount of Tickets: ");
        ttamon = new JLabel("==> Total Amount: ");
        amondue = new JLabel("==> Amount Due: £");
        amonpaid = new JLabel("==> Amount Paid: £");
        label5 = new JLabel(paycount);
        spacing6 = new JLabel("                        ");
        spacing7 = new JLabel("                                                                                                                     ");
        spacing8 = new JLabel("                                                                                                                                                         ");
        spacing9 = new JLabel("                                             ");
        spacing10 = new JLabel("                               ");



        //setting font for buttons, textfields and labels
        pickstall.setFont(new Font("Rockwell", Font.BOLD, 20));
        frontBtn.setFont(new Font("System", Font.BOLD, 22)); 
        middleBtn.setFont(new Font("System", Font.BOLD, 22)); 
        backBtn.setFont(new Font("System", Font.BOLD, 22)); 
        private1Btn.setFont(new Font("System", Font.BOLD, 22)); 
        tictype.setFont(new Font("Rockwell", Font.BOLD, 20)); 
        amontic.setFont(new Font("Rockwell", Font.BOLD, 20)); 
        ttamon.setFont(new Font("Rockwell", Font.BOLD, 20)); 
        amondue.setFont(new Font("Rockwell", Font.BOLD, 20)); 
        amonpaid.setFont(new Font("Rockwell", Font.BOLD, 20));
        stalltypeTxt.setFont(new Font("Verdana", Font.BOLD, 20));
        tickettypeTxt.setFont(new Font("Verdana", Font.BOLD, 20));
        amountticketsTxt.setFont(new Font("Verdana", Font.BOLD, 20));
        totalamountTxt.setFont(new Font("Verdana", Font.BOLD, 20));
        amountdueTxt.setFont(new Font("Verdana", Font.BOLD, 20));
        amountpaidTxt.setFont(new Font("Verdana", Font.BOLD, 20));

        twentypenceBtn.setFont(new Font("Century Gothic", Font.BOLD, 28)); 
        fiftypenceBtn.setFont(new Font("Century Gothic", Font.BOLD, 28)); 
        onepoundBtn.setFont(new Font("Century Gothic", Font.BOLD, 28));
        twopoundsBtn.setFont(new Font("Century Gothic", Font.BOLD, 28)); 
        fivepoundsBtn.setFont(new Font("Century Gothic", Font.BOLD, 28)); 
        tenpoundsBtn.setFont(new Font("Century Gothic", Font.BOLD, 28)); 
        twentypoundsBtn.setFont(new Font("Century Gothic", Font.BOLD, 28));

        C.setFont(new Font("Serif", Font.BOLD, 28));

        stalltypeTxt.setEditable(false);
        tickettypeTxt.setEditable(false);
        totalamountTxt.setEditable(false);
        amountdueTxt.setEditable(false);
        amountpaidTxt.setEditable(false);



        //positioning all buttons, textfields and labels
        JPanel top = new JPanel(); 
        top.add(label5);
        add("North", top);

        JPanel mid = new JPanel();
        mid.add(pickstall);
        mid.add(stalltypeTxt);
        mid.add(spacing6);

        mid.add(private1Btn);
        mid.add(frontBtn);
        mid.add(middleBtn);
        mid.add(backBtn);

        mid.add(tictype);
        mid.add(tickettypeTxt);
        mid.add(spacing7);

        mid.add(amontic);
        mid.add(amountticketsTxt);
        mid.add(spacing8);

        mid.add(ttamon);
        mid.add(totalamountTxt);
        mid.add(calcBtn);
        mid.add(spacing10);

        mid.add(amonpaid);
        mid.add(amountpaidTxt);
        mid.add(spacing9);

        mid.add(twentypenceBtn);
        mid.add(fiftypenceBtn);
        mid.add(onepoundBtn);
        mid.add(twopoundsBtn);
        mid.add(fivepoundsBtn);
        mid.add(tenpoundsBtn);
        mid.add(twentypoundsBtn);

        mid.add(amondue);
        mid.add(amountdueTxt);
        mid.add(C);
        add("Center", mid);




        calcBtn.addActionListener(this);
        private1Btn.addActionListener(this);
        frontBtn.addActionListener(this);
        middleBtn.addActionListener(this);
        backBtn.addActionListener(this);

        twentypenceBtn.addActionListener(this);
        fiftypenceBtn.addActionListener(this);
        onepoundBtn.addActionListener(this);
        twopoundsBtn.addActionListener(this);
        fivepoundsBtn.addActionListener(this);
        tenpoundsBtn.addActionListener(this);
        twentypoundsBtn.addActionListener(this);

        C.addActionListener(this);


        setVisible(true);

    }


     public void actionPerformed(ActionEvent e){
         // event handler for the buttons



        if (e.getSource() == private1Btn)
        {
            stalltypeTxt.setText("Private Stall Location is Chosen");
            tickettypeTxt.setText("30.85");
        }

        else if (e.getSource() == frontBtn)
        {
            stalltypeTxt.setText("Front Stall Location is Chosen");
            tickettypeTxt.setText("15.00");
        }
        else if (e.getSource() == middleBtn)
        {
            stalltypeTxt.setText("Middle Stall Location is Chosen");
            tickettypeTxt.setText("10.20");
        }
        else if (e.getSource() == backBtn)
        {
            stalltypeTxt.setText("Back Stall Location is Chosen");
            tickettypeTxt.setText("5.70");

        }
        else if (e.getSource() == tickettypeTxt)
        {

             type = Double.parseDouble(tickettypeTxt.getText());
        }
        else if (e.getSource() == amountticketsTxt)
        {
            number = Integer.parseInt(amountticketsTxt.getText());
        }
        else if (e.getSource() == calcBtn)
        {

        Workings c = new Workings();
        w.setType(type);
        w.setNumber(number);
        double total = w.calculateBill();

        totalamountTxt.setText(pounds.format(total));
        }


     }
     }

半途而废的辅助课程，称为 Workings

public class Workings {
    // private instance variables
    private double type, number;

    // public no-argument constructor
    public Workings() { }

    // public constructor with four arguments
    public Workings(double t, int n)
    {
        type = t;
        number = n;


    }

    // public 'set' methods
    public void setType(double t) { type = t; }
    public void setNumber(int n) { number = n; }


    // public method to calculate the bill
    public double calculateBill()
    {
        double total = type * number ;
        return total;
    }
}
4

2 回答 2

0

仅当用户在该字段中按键盘上的 Enter 键时才会ActionListener触发。JTextField这是不直观的，所以我会说这是一个很大的禁忌ActionListener。

相反，使用 aFocusListener从文本字段中获取“用户离开文本字段”事件。这应该会提取输入的数据，然后它应该可以工作。

于 2013-11-09T21:34:52.410 回答
0

这是你的问题

else if (e.getSource() == tickettypeTxt)
{
    type = Double.parseDouble(tickettypeTxt.getText());
}
else if (e.getSource() == amountticketsTxt)
{
    number = Integer.parseInt(amountticketsTxt.getText());
}
else if (e.getSource() == calcBtn)
{
    Workings c = new Workings();
    w.setType(type);
    w.setNumber(number);
    double total = w.calculateBill();

    totalamountTxt.setText(pounds.format(total));
}

删除前两个else ifs 并执行此操作

else if (e.getSource() == calcBtn)
{
    type = Double.parseDouble(tickettypeTxt.getText());
    number = Integer.parseInt(amountticketsTxt.getText());

    Workings c = new Workings();
    w.setType(type);
    w.setNumber(number);
    double total = w.calculateBill();

    totalamountTxt.setText(pounds.format(total));
}
于 2013-11-09T21:38:19.407 回答