Java:提交后禁用所有 JToggleButtons — setEnabled(false);

Question

我目前正在开发一个预订系统作为我学位的任务。按下按钮后禁用所选 JToggleButtons 的最佳方法是什么？所以购买后就没有座位了。我曾尝试使用 for 循环和数组，但在检索按下了哪个按钮时遇到了一些麻烦。这是我的代码，如果你能更好地理解它，请运行它。

PS:我没有使用数据库。

谢谢你。

// CM1203 Fundamentals of Computing with Java; Second Assignement.
// Walter Carvalho - C1001984; 2012.
// Cardiff University

// Load Libraries
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
import java.text.*;

public class cinemaSystem extends JFrame implements ActionListener {
    // Global Variables
    boolean lselected, rselected, mselected;
    double chargeDue;
    int a, b, c;
    static Ticket oapticket, childticket, adultticket;
    JFrame frame = new JFrame(); // Creates JFrame
    JLabel title, lchild, ladult, loap, ltotalprice, time;
    JTextField child, adult, oap, totalprice;
    JButton submit;
    JRadioButton time1, time2, time3, time4, time5; // Radio Butons
    JToggleButton l[][], m[][], r[][]; // Names grid of JButtons
    JPanel panel1, panel2, panel3, panel4, panel5, panel6;
    ArrayList<String> seatsAvailable = new ArrayList<String>();
    ArrayList<String> coupon = new ArrayList<String>();

    // Constructor
    public cinemaSystem(){

            title = new JLabel("Cinema Booking System");
            title.setFont(new Font("Helvetica", Font.BOLD, 30));
            title.setLocation(12,5);
            title.setSize(600, 60);

            frame.setLayout(null); // Setting Grid Layout
            // panel1.setLayout(new GridLayout(seat,row));
            l = new JToggleButton[4][4]; // Allocating Size of Grid
            panel1 = new JPanel(new GridLayout(4,4));
            panel1.setBounds(20, 95, 220, 140);
            for(int y = 0; y <4 ; y++){
                    for(int x = 0; x < 4; x++){
                        l[x][y] = new JToggleButton("L" + y + x); // Creates New JButton
                        l[x][y].addActionListener(this);
                        seatsAvailable.add("L" + y + x);
                        panel1.add(l[x][y]); //adds button to grid
                    }
            }

            m = new JToggleButton[4][2]; // Allocating Size of Grid
            panel2 = new JPanel(new GridLayout(2,4));
            panel2.setBounds(240, 165, 220, 70);
            for(int y = 0; y <2 ; y++){
                    for(int x = 0; x < 4; x++){
                        m[x][y] = new JToggleButton("M" + y + x); // Creates New JButton
                        m[x][y].addActionListener(this);
                        seatsAvailable.add("M" + y + x);
                        panel2.add(m[x][y]); //adds button to grid
                    }
            }

            r = new JToggleButton[4][4]; // Allocating Size of Grid
            panel3 = new JPanel(new GridLayout(4,4));
            panel3.setBounds(460, 95, 220, 140);
            for(int y = 0; y <4 ; y++){
                    for(int x = 0; x < 4; x++){
                        r[x][y] = new JToggleButton("R" + y + x); // Creates New JButton
                        r[x][y].addActionListener(this);
                        seatsAvailable.add("R" + y + x);
                        panel3.add(r[x][y]); //adds button to grid
                    }
            }

            panel4 = new JPanel(new FlowLayout());
            panel4.setBounds(0, 250, 300, 70);

            lchild = new JLabel("Child");
            child = new JTextField("0", 2);
            child.addActionListener(this);

            ladult = new JLabel("Adult");
            adult = new JTextField("0", 2);
            adult.addActionListener(this);

            loap = new JLabel("OAP");
            oap = new JTextField("0", 2);
            oap.addActionListener(this);

            submit = new JButton("Submit");
            submit.addActionListener(this);

            oapticket = new Ticket(4.70);
            childticket = new Ticket(3.50);
            adultticket = new Ticket(6.10);     

            child.addKeyListener(new MyKeyAdapter());
            oap.addKeyListener(new MyKeyAdapter());
            adult.addKeyListener(new MyKeyAdapter());

            panel4.add(lchild);
            panel4.add(child);
            panel4.add(ladult);
            panel4.add(adult);
            panel4.add(loap);
            panel4.add(oap);
            panel4.add(submit);

            panel5 = new JPanel(new FlowLayout());
            panel5.setBounds(240, 250, 300, 70);

            ltotalprice = new JLabel("Charge Due (£): ");
            totalprice = new JTextField("£0.00", 5);
            totalprice.setEnabled(false);
            panel5.add(ltotalprice);
            panel5.add(totalprice);

            panel6 = new JPanel(new FlowLayout());
            panel6.setBounds(0, 55, 560, 30);

            time = new JLabel("Please select a film time: ");
            time1 = new JRadioButton("13:00", true);
            time2 = new JRadioButton("15:00", false);
            time3 = new JRadioButton("17:00", false);
            time4 = new JRadioButton("19:00", false);
            time5 = new JRadioButton("21:00", false);

            ButtonGroup group = new ButtonGroup();
            group.add(time1);
            group.add(time2);
            group.add(time3);
            group.add(time4);
            group.add(time5);
            panel6.add(time);
            panel6.add(time1);
            panel6.add(time2);
            panel6.add(time3);
            panel6.add(time4);
            panel6.add(time5);
            time1.addActionListener(this);
            time2.addActionListener(this);
            time3.addActionListener(this);
            time4.addActionListener(this);
            time5.addActionListener(this);
            frame.add(title);
            frame.add(panel1);
            frame.add(panel2);
            frame.add(panel3);
            frame.add(panel4);
            frame.add(panel5);
            frame.add(panel6);
            frame.setPreferredSize(new Dimension(700, 350));
            frame.setTitle("Cinema Booking");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.pack(); //sets appropriate size for frame
            frame.setVisible(true); //makes frame visible


    }

    // Calculates Charge Due for current transaction.
    public double calcChargeDue(){
        DecimalFormat df = new DecimalFormat("#.##");
        double chargeDue = 0.0;
        chargeDue = (a*childticket.price) + (b*oapticket.price) + (c*adultticket.price);
        totalprice.setText("£"+df.format(chargeDue));
        return chargeDue;
    }

    // Method to check if the number of people matches the number of seats selected.
    public void check(){
        int check = coupon.size();
        int noTickets = a + b + c;
        if (check != noTickets){
            submit.setEnabled(false);
        }
        else {
            submit.setEnabled(true);
        }

    }

    // Ticket Object
    public class Ticket {

        double price;

        // Constructor
        public Ticket(double cost) {
            price = cost;
        }

        public double getTicketPrice() {
            return price;
        }

    }

    public void actionPerformed(ActionEvent e)
    {

        a = Integer.parseInt(child.getText());
        b = Integer.parseInt(oap.getText());
        c = Integer.parseInt(adult.getText());

        for(int y = 0; y < 4; y++){
            for(int x = 0; x < 4; x++){

                lselected = l[x][y].isSelected();
                rselected = r[x][y].isSelected();

                if (e.getSource() == l[x][y]) {
                    if(lselected == true){
                        coupon.add(e.getActionCommand());
                        calcChargeDue();
                        check();
                    }
                    else {
                        coupon.remove(e.getActionCommand());
                        check();
                    }
                }

                if (e.getSource() == r[x][y]) {
                    if(rselected == true){
                        coupon.add(e.getActionCommand());
                        calcChargeDue();
                        check();
                    }
                    else {
                        coupon.remove(e.getActionCommand());
                        check();
                    }
                }

                if (e.getSource() == oap){
                    calcChargeDue();
                    check();
                }

                if (e.getSource() == adult){
                    calcChargeDue();
                    check();
                }

                if (e.getSource() == child){
                    calcChargeDue();
                    check();
                }

            }
        }

        for(int y = 0; y < 2; y++){
            for(int x = 0; x < 4; x++){

                mselected = m[x][y].isSelected();

                if (e.getSource() == m[x][y]) {
                    if(mselected == true){
                        coupon.add(e.getActionCommand());
                        calcChargeDue();
                        check();
                    }
                    else {
                        coupon.remove(e.getActionCommand());
                        check();
                    }
                }
            }
        }

        if(time1 == e.getSource()){

        }

        if(time2 == e.getSource()){

        }

        if(time3 == e.getSource()){

        }

        if(time4 == e.getSource()){

        }

        if(time5 == e.getSource()){

        }

        if(submit == e.getSource()) {

            for(int y = 0; y < 4; y++){
                for(int x = 0; x < 4; x++){

                    lselected = l[x][y].isSelected();
                    rselected = r[x][y].isSelected();

                    if (lselected == true) {
                            l[x][y].setEnabled(false);
                    }

                    if (rselected == true) {
                            r[x][y].setEnabled(false);
                    }

                }
            }

            for(int y = 0; y < 2; y++){
                for(int x = 0; x < 4; x++){

                    mselected = m[x][y].isSelected();

                    if (mselected == true) {
                            m[x][y].setEnabled(false);
                    }
                }
            }

            Collections.sort(coupon);
            System.out.println("Here's your ticket:");
            System.out.println(coupon);
            System.out.println("Child: " + child.getText());
            System.out.println("Adult: " + adult.getText());
            System.out.println("OAP: " + oap.getText());
            System.out.println("Total Price: " + totalprice.getText());
            System.out.println("Thank you. Enjoy your film.");
            System.out.println(" ");
            coupon.clear();
            child.setText("0");
            adult.setText("0");
            oap.setText("0");
        }

    }

    // Main Class
    public static void main(String[] args) {
            new cinemaSystem(); //makes new ButtonGrid with 2 parameters
    }
}

相关: Multiple Bookings System

Answer 1

解决方案是使用 List<AbstractButton>或数组，然后遍历列表或数组检查以查看哪些按钮 isSelected()返回真。

不过，为了获得更好的帮助，请发布您的代码。