Question

请有人帮助我，我正在尝试为我的电影票系统分配预订座位...所以问题是我希望按钮的文字在选择时显示在文本区域而不显示取消选择时只有特定文本..但是当我取消选择一个按钮时，整个文本区域都被清除。

例如当我选择C1，C2，C3时 - 它在文本区域中正确显示，但是如果我想取消选择C3，则文本区域现在必须只显示C1＆amp; C2。相反，它清除了整个文本区域！

有人能在逻辑中发现问题吗？

  import java.awt.*;
  import static java.awt.Color.blue;
  import javax.swing.*;
  import java.awt.event.*;
  import javax.swing.border.Border;


  public class Cw_Test2  extends JFrame {

JButton btn_payment,btn_reset;
JButton buttons;
JTextField t1,t2; 



public static void main(String[] args) {
    // TODO code application logic here
   new  Cw_Test2();
}

public Cw_Test2()
{
    Frame(); 

}

  public void Frame()
{
    this.setSize(1200,700);     //width, height
    this.setTitle("Seat Booking");
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    this.setLocationRelativeTo(null);

    Font myFont = new Font("Serif", Font.ITALIC | Font.BOLD, 6);
    Font newFont = myFont.deriveFont(20F);

    t1=new JTextField();  
    t1.setBounds(15, 240, 240,30); 

    JPanel thePanel = new JPanel()
     {
        @Override
         public Dimension getPreferredSize() {
         return new Dimension(350, 350);
        };
    };    
    thePanel.setLayout(null);

    JPanel ourPanel = new JPanel()        
    {
        @Override
         public Dimension getPreferredSize() {
         return new Dimension(350, 350);
        };
    };
    //ourPanel.setBackground(Color.green);
    Border ourBorder = BorderFactory.createLineBorder(blue , 2);
    ourPanel.setBorder(ourBorder);
    ourPanel.setLayout(null);
    ourPanel.setBounds(50,90, 1100,420); 

    JPanel newPanel = new JPanel()        
    {
        @Override
         public Dimension getPreferredSize() {
         return new Dimension(350, 350);
        };
    };
    //ourPanel.setBackground(Color.green);
    Border newBorder = BorderFactory.createLineBorder(blue , 1);
    newPanel.setBorder(newBorder);
    newPanel.setLayout(null);
    newPanel.setBounds(790,50, 270,340); 

    JLabel label1 = new JLabel( new ColorIcon(Color.GRAY, 400, 100) );
    label1.setText( "SCREEN" );
    label1.setHorizontalTextPosition(JLabel.CENTER);
    label1.setVerticalTextPosition(JLabel.CENTER);
    label1.setBounds(130,50, 400,30);

    JLabel label2 = new JLabel(" CINEMA TICKET MACHINE ");
    label2.setBounds(250,50,400,30);
    label2.setFont(newFont);
    JLabel label3 = new JLabel("Please Select Your Seat");
    label3.setBounds(270,10,500,30);
    label3.setFont(newFont);
    JLabel label4 = new JLabel("Selected Seats:");
    label4.setBounds(20,10,200,30);
    label4.setFont(newFont);


    btn_payment=new JButton("PROCEED TO PAY");  
    btn_payment.setBounds(35,290,200,30);

    JLabel label6 = new JLabel("Center Stall");
   label6.setBounds(285,172,200,30);

     JPanel seatPane, seatPane1, seatPane2, seatPane3, seatPane4, seatPane5;
      JToggleButton[] seat2 = new JToggleButton[8];

    JTextArea chosen = new JTextArea();
 chosen.setEditable(false);
 chosen.setLineWrap(true);
 chosen.setBounds(20, 60, 200, 100); 

  // Center Seats
 seatPane1 = new JPanel();
 seatPane1.setBounds(200,200,250,65);
 seatPane1.setLayout(new FlowLayout());

 for(int x=0; x<8; x++){


     seat2[x] = new JToggleButton("C"+(x+1));


     seatPane1.add(seat2[x]);


    seat2[x].addActionListener(new ActionListener(){

        public void actionPerformed(ActionEvent ev){

            AbstractButton abstractButton = (AbstractButton) ev.getSource();
            boolean selected = abstractButton.getModel().isSelected();

            for(int x=0; x<8; x++){


            if(seat2[x]==ev.getSource()){
                if(selected){


                    chosen.append(seat2[x].getText()+",");


                }else{
                    chosen.setText(seat2[x].getText().replace(seat2[x].getText(),""));





                }



            }

            }

        }

    }); 
 }

 newPanel.add(chosen);
 ourPanel.add(seatPane1);
 ourPanel.add(label6);
 thePanel.add(label2);
    ourPanel.add(label3);
    ourPanel.add(label1);
    newPanel.add(btn_payment);
    newPanel.add(label4);

    ourPanel.add(newPanel);
    thePanel.add(ourPanel);
    add(thePanel);
    setResizable(false);
    this.setVisible(true);

}


  public static class ColorIcon implements Icon
{
    private Color color;
    private int width;
    private int height;

    public ColorIcon(Color color, int width, int height)
    {
        this.color = color;
        this.width = width;
        this.height = height;
    }

    public int getIconWidth()
    {
        return width;
    }

    public int getIconHeight()
    {
        return height;
    }

    public void paintIcon(Component c, Graphics g, int x, int y)
    {
        g.setColor(color);
        g.fillRect(x, y, width, height);
    }
}

Answer 1

当选择或取消选择任何席位时，此代码会迭代一系列席位（在方法showSelectedSeats()中）并更新文本区域以显示所选席位。

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

public class CinemaTicketMachine {

    private JComponent ui = null;
    private JToggleButton[] seats = new JToggleButton[80];
    private JTextArea selectedSeats = new JTextArea(3, 40);

    CinemaTicketMachine() {
        initUI();
    }

    public void initUI() {
        if (ui!=null) return;

        ui = new JPanel(new BorderLayout(4,4));
        ui.setBorder(new EmptyBorder(4,4,4,4));

        selectedSeats.setLineWrap(true);
        selectedSeats.setWrapStyleWord(true);
        selectedSeats.setEditable(false);
        ui.add(new JScrollPane(selectedSeats), BorderLayout.PAGE_END);

        JPanel cinemaFloor = new JPanel(new BorderLayout(40, 0));
        cinemaFloor.setBorder(new TitledBorder("Available Seats"));
        ui.add(cinemaFloor, BorderLayout.CENTER);
        JPanel leftStall = new JPanel(new GridLayout(0, 2, 2, 2));
        JPanel centerStall = new JPanel(new GridLayout(0, 4, 2, 2));
        JPanel rightStall = new JPanel(new GridLayout(0, 2, 2, 2));

        cinemaFloor.add(leftStall, BorderLayout.WEST);
        cinemaFloor.add(centerStall, BorderLayout.CENTER);
        cinemaFloor.add(rightStall, BorderLayout.EAST);

        ActionListener seatSelectionListener = new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                showSelectedSeats();
            }
        };

        for (int ii=0; ii <seats.length; ii++) {
            JToggleButton tb = new JToggleButton("S-" + (ii+1));
            tb.addActionListener(seatSelectionListener);
            seats[ii] = tb;
            int colIndex = ii%8;
            if (colIndex<2) {
                leftStall.add(tb);
            } else if (colIndex<6) {
                centerStall.add(tb);
            } else {
                rightStall.add(tb);
            }
        }
    }

    private void showSelectedSeats() {
        StringBuilder sb = new StringBuilder();
        for (int ii=0; ii<seats.length; ii++) {
            JToggleButton tb = seats[ii];
            if (tb.isSelected()) {
                sb.append(tb.getText());
                sb.append(", ");
            }
        }
        String s = sb.toString();
        if (s.length()>0) {
            s = s.substring(0, s.length()-2);
        }
        selectedSeats.setText(s);
    }

    public JComponent getUI() {
        return ui;
    }

    public static void main(String[] args) {
        Runnable r = new Runnable() {
            @Override
            public void run() {
                CinemaTicketMachine o = new CinemaTicketMachine();

                JFrame f = new JFrame(o.getClass().getSimpleName());
                f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
                f.setLocationByPlatform(true);

                f.setContentPane(o.getUI());
                f.pack();
                f.setMinimumSize(f.getSize());

                f.setVisible(true);
            }
        };
        SwingUtilities.invokeLater(r);
    }
}

如何使此文本区域显示选择了哪些切换按钮？

1 个答案: