1

我最近在做一个项目——公交车售票机。这是一个帮助用户打印门票的程序。

我有一个屏幕 ( destPanel)，其中显示要选择的城市列表 ( JList departures)。一旦用户选择了一个城市addListSelectionListener，第一个JList将保存并返回一个时间表（JList timetable）供用户再次选择，这次保存选择的出发地以便稍后在车票上打印。

addListSelectionListener显示时间表时，我无法停止。这是为了能够选择要保存的出发地以打印车票。

我添加了我的三个课程，展示了我一直在做什么。

第一类：

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.util.Arrays;
import java.util.Vector;
import javax.swing.ButtonGroup;
import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.JRadioButton;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.ListSelectionModel;
import javax.swing.SwingUtilities;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;



public class TicketGUI extends JFrame
{
    public static void main(String[] args)
    {
        new TicketGUI();
    }

    private JPanel destPanel    = new JPanel();
    private JPanel departPanel  = new JPanel();
    private JPanel payPanel     = new JPanel();

    private JButton[] buttons;


    // Display size
    private final int WIDTH = 310;
    private final int HEIGHT = 150;

    JList departJList;
    JList defltList;
    Vector<Enum> listContent = new Vector<Enum>();


    //Following line used for adding info to display JList.
    //Vector<Object> listContent = new Vector<Object>();


    JList timeTable; //Not being used.
    private DefaultListModel listModel; //Not being used.
    Vector<String> newListContent = new Vector<String>(); //Not being used.


    JTextArea textArea = new JTextArea();
    JTextField payField = new JTextField(15);

    public TicketGUI()
    {
        this.setTitle("Bus Ticket Machine");
        setLayout(new BorderLayout());
        JPanel agePanel = new JPanel();
        JRadioButton adultButton = new JRadioButton("Adult");
        adultButton.setSelected(true);

        JRadioButton studentButton = new JRadioButton("Student");

        JRadioButton childButton = new JRadioButton("Children");

        //Group the radio buttons.
        ButtonGroup group = new ButtonGroup();
        group.add(adultButton);
        group.add(studentButton);
        group.add(childButton);


        JPanel bPanel = new JPanel();
        bPanel.setMaximumSize(new Dimension(100, 100));


        bPanel.setLayout(new GridLayout(4, 3));
        buttons= new JButton[12];
        for (int i=0; i<12; i++)
        {
            buttons[i]=new JButton();
            //buttons[i].addActionListener(this);
        }
        for (int i=1; i<10; i++)
        {
            buttons[i-1].setText(""+i);
            bPanel.add(buttons[i-1]);
        }
        buttons[9].setText("X");
        bPanel.add(buttons[9]);
        buttons[10].setText("0");
        bPanel.add(buttons[10]);
        buttons[11].setText("OK");
        bPanel.add(buttons[11]);
        payField.setText("Card Number");
        payField.setEditable(false);

        payPanel.setLayout(new BorderLayout());

        payPanel.add(payField, BorderLayout.NORTH);

        // Display
//        listContent.add("London");
//      listContent.add("Bristol");
//      listContent.add("Sheffield");
//      listContent.add("Birmingham");
//      listContent.add("...");


//      listContent.add("Here under list to be displayed after choosing a city");
//      listContent.add("1. London -> Bristol  Depart: 11:45 Arrives: 13:15");
//      listContent.add("2. London -> Bristol  Depart: 12:30 Arrives: 15:00");
//      listContent.add("3. London -> Bristol  Depart: 13:45 Arrives: 16:15");
//      listContent.add("4. London -> Bristol  Depart: 14:30 Arrives: 17:00");
//      listContent.add("...");

//      listContent.add("Your Journey");    
//      listContent.add("Ticket: Adult");
//      listContent.add("From: London ");
//      listContent.add("Going to: Bristol");
//      listContent.add("Leaving: 11:45");
//      listContent.add("Fare: £ 18.00");

        listContent = new Vector<Enum>(Arrays.asList(EnumCity.values()));

        System.out.print(listContent + "one");


//        defltList = new JList(listContent);
//
//        System.out.print(defltList);


        departJList = new JList(listContent);
//      departJList.add(listContent);

        System.out.print("\n\n");
        System.out.print(departJList + "two");

        timeTable = new JList();

        departJList.addListSelectionListener(new ListSelectionListener() {

            public void valueChanged(ListSelectionEvent e)
            {

                if (!e.getValueIsAdjusting())
                {
                    TimeTable selected = new TimeTable();   
                    selected.setTimeTable();
                    newListContent.addAll(selected.getTimeTable());

//                  timeTable.setListData(newListContent.toArray());
//                  departJList.setListData(newListContent);
                }

                System.out.println(newListContent);

//              timeTable.setListData(newListContent.toArray());
                departJList.setListData(newListContent);
//              departJList.setListData(newListContent);    

            }
            });


    JScrollPane m_clScrollpane = new JScrollPane(departJList);
        m_clScrollpane.setPreferredSize(new Dimension(WIDTH, HEIGHT));

        JPanel farePanel = new JPanel(new GridLayout(4, 1));
        farePanel.add(adultButton);
        farePanel.add(studentButton);
        farePanel.add(childButton);
        JTextField tf = new JTextField("£ 0.00");
        tf.setEditable(false);
        farePanel.add(tf);
        destPanel.add(farePanel);

        destPanel.add(m_clScrollpane);
        payPanel.add(bPanel);

        add(destPanel);
        add(payPanel, BorderLayout.EAST);

        setVisible(true);
        pack();

        addWindowListener(new java.awt.event.WindowAdapter() 
        {
            public void windowClosing(java.awt.event.WindowEvent evt) {
                dispose();
                System.exit(0);
        }
        });
    }

}

第二类：

public enum EnumCity {
    London,
    Bristol,
    Sheffield,
    Birmingham
}

第三类：

import java.util.Vector;

public class TimeTable {

    private String timeTable;

    public TimeTable()
    {
    }   

    public String setTimeTable()
    {   
        return this.timeTable;
    }

    public Vector<String> getTimeTable()
    {
        Vector<String> timeList = new Vector<String>();
        timeList.addElement("1. London -> Bristol  Depart: 11:45 Arrives: 13:15");
        timeList.addElement("2. London -> Bristol  Depart: 12:30 Arrives: 15:00");
        timeList.addElement("3. London -> Bristol  Depart: 13:45 Arrives: 16:15");
        timeList.addElement("4. London -> Bristol  Depart: 14:30 Arrives: 17:00");

        return timeList;
    }

}
4

2 回答 2

1

您可以建立两个不同的列表，一个管理城市列表，一个管理时间表列表，而不是替换列表中的数据（这通常是一个好主意）。

然后使用 a CardLayout，您可以在它们之间切换。

这意味着您不必担心每次切换数据时都会切换选择侦听器。

于 2013-07-12T00:06:36.093 回答
0

阻止侦听器工作的一种方法是删除它。如果您打算交换列表中的数据，您可以这样做：

  departJList.addListSelectionListener(new ListSelectionListener() {

     public void valueChanged(ListSelectionEvent e) {

        if (!e.getValueIsAdjusting()) {

           // ******* added **********
           ((JList)e.getSource()).removeListSelectionListener(this);

           TimeTable selected = new TimeTable();
           selected.setTimeTable();
           newListContent.addAll(selected.getTimeTable());
        }

        System.out.println(newListContent);
        departJList.setListData(newListContent);

     }
  });
于 2013-07-11T23:47:01.710 回答