Question

我试图将数据库的数据填充到jtable中，但是当我运行代码时，数据显示在控制台上而不是在Jframe上。这是控制台输出：

93203 , KERN , ARVIN , CA , 2012 , 12 , All Ages , 83 , 59.4 , 41.5 , 50.5
93203 , KERN , ARVIN , CA , 2012 , 12 , Adults (18+) , 29 , 59.4 , 41.5 , 50.5
93210 , FRESNO , COALINGA , CA , 2012 , 1 , Children (0-17) , 58 , 64.9 , 36.1 , 50.5
93210 , FRESNO , COALINGA , CA , 2012 , 1 , All Ages , 99 , 64.9 , 36.1 , 50.5
93210 , FRESNO , COALINGA , CA , 2012 , 1 , Adults (18+) , 41 , 64.9 , 36.1 , 50.5
93210 , FRESNO , COALINGA , CA , 2012 , 2 , Children (0-17) , 58 , 66.9 , 38.4 , 52.7
93210 , FRESNO , COALINGA , CA , 2012 , 2 , All Ages , 99 , 66.9 , 38.4 , 52.7
93210 , FRESNO , COALINGA , CA , 2012 , 2 , Adults (18+) , 41 , 66.9 , 38.4 , 52.7
93210 , FRESNO , COALINGA , CA , 2012 , 3 , Adults (18+) , 41 , 68.6 , 42.2 , 55.4
93210 , FRESNO , COALINGA , CA , 2012 , 3 , Children (0-17) , 58 , 68.6 , 42.2 , 55.4
93210 , FRESNO , COALINGA , CA , 2012 , 3 , All Ages , 99 , 68.6 , 42.2 , 55.4

这是GUI的代码

public class WeatherFrame extends JFrame {

    private JPanel contentPane;
    private JTable table;
    HealthData health = new HealthData();
    private DefaultTableModel model;
    String[] columnNames = {"zipcode", "county", "city", "state", "year", "month","ageGroup",
                            "numOfVisits", "MonthlyMax", "MonthlyMin", "MonthlyNor"};

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    WeatherFrame frame = new WeatherFrame();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the frame.
     */
    public WeatherFrame() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 800, 300);
        contentPane = new JPanel();
        contentPane.setBounds(100, 100,750, 200);
        setContentPane(contentPane);
        contentPane.setLayout(null);

        JScrollPane scrollPane = new JScrollPane();
        scrollPane.setBounds(6, 25, 788, 180);
        contentPane.add(scrollPane);

        model = new DefaultTableModel();
        populateTable();
        table = new JTable(model);

        scrollPane.setViewportView(table);

        JButton btnInsert = new JButton("insert");
        btnInsert.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
            }
        });
        btnInsert.setBounds(315, 217, 117, 29);
        contentPane.add(btnInsert);

        JButton btnDelete = new JButton("delete");
        btnDelete.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
            }
        });
        btnDelete.setBounds(198, 243, 117, 29);
        contentPane.add(btnDelete);

        JButton btnSearch = new JButton("search");
        btnSearch.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
            }
        });
        btnSearch.setBounds(81, 243, 117, 29);
        contentPane.add(btnSearch);

        JLabel lblWeatherTable = new JLabel("Weather Table");
        lblWeatherTable.setBounds(149, 6, 107, 16);
        contentPane.add(lblWeatherTable);

        JButton btnNext = new JButton("update");
        btnNext.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
            }
        });
        btnNext.setBounds(198, 217, 117, 29);
        contentPane.add(btnNext);

        JButton btnRefresh = new JButton("refresh");
        btnRefresh.setBounds(81, 217, 117, 29);
        contentPane.add(btnRefresh);
    }

    public void populateTable() {

        for(String name: columnNames)
            model.addColumn(name);
        for (int i = 0; i < health.showAllData().size(); i++) {
            int zipcode = health.showAllData().get(i).getZipCode();
            String county = health.showAllData().get(i).getCounty();
            String city = health.showAllData().get(i).getCity();
            String state = health.showAllData().get(i).getState();
            int year = health.showAllData().get(i).getYear();
            int month = health.showAllData().get(i).getMonth();
            String ageGroup = health.showAllData().get(i).getAgeGroup();
            int numVisit = health.showAllData().get(i).getNumOfVisits();
            float max = health.showAllData().get(i).getMMax();
            float min = health.showAllData().get(i).getMMin();
            float nor = health.showAllData().get(i).getMNor();

            Object[] data = {zipcode, county, city, state, year, month, ageGroup, numVisit, max, min, nor};
            model.addRow(data);
        }

    }
}

我不确定为什么数据不会在Jframe上输出，有人可以建议一种方法来解决这个问题。先感谢您。我认为错误在populateTable方法中，但是我在for循环中测试变量并且正确的数据被传递到那些局部变量，所以我有点坚持找出逻辑错误的位置。当我执行此代码时填充数据进入Jtable，java应用程序出现在任务栏上，但没有框架。

我使用了几个println来检查数据是否在populateTable方法中的第二个for循环中传递给局部变量，并且它们都被传入。对于向模型添加数据的语句似乎没有任何问题，所以我无法弄清楚为什么它不起作用。数据可以溢出表大小吗？

控制台上的数据输出而不是GUI

0 个答案: