Question

我是java的新手。我的大多数问题都没有得到答复，我不知道我的问题有什么问题。我希望这个问题得到一些答案。

所以，现在我正在创建一个框架，这个框架包含tabbedPane，tabbedPane包含两个JPanels。所有这些都是在一个函数createAndShowGUI()

中完成的

还有另一个功能是使用for循环创建按钮，我想将这个新按钮添加到JPanel panel。这是我的代码。我想将createButton()方法创建的按钮添加到createAndShowGUI()方法

中创建的面板

public class Try extends JFrame {

    static Connection conn;
    //JPanel panel;
    static JButton buttons;
    static int totalRows;
    static int recordPerPage = 1000000;
    static int totalPages = 0;

    private static JPanel contentPane;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    createAndShowGUI();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }

        });
    }

    protected static void createAndShowGUI() throws SQLException {
        JFrame frame = new JFrame();
        frame.setVisible(true);
        frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE);
        frame.setBounds(30, 50, 1300, 600);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        contentPane.setLayout(new BorderLayout(0, 0));
        frame.setContentPane(contentPane);

        UIManager.put("TabbedPane.selected", Color.lightGray);
        JTabbedPane tabbedPane = new JTabbedPane();
        tabbedPane.setBorder(new EmptyBorder(10, 10, 10, 10));
        frame.add(tabbedPane);

        JPanel panel = new JPanel();
        tabbedPane.addTab("TABLE", null, panel, null);
        tabbedPane.setFont( new Font( "Dialog", Font.BOLD|Font.ITALIC, 16 ) );
        panel.setBackground(Color.white);

        JPanel panel_1 = new JPanel();
        tabbedPane.addTab("GRAPH", null, panel_1, null);
        panel_1.setBackground(Color.white);

        JTable table = new JTable();
        panel.add(table);
        table.setFillsViewportHeight(true);

        createDBConnection();
    }

    private static void createDBConnection() throws SQLException {
        try {
            Class.forName("org.h2.Driver");
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        try {
            conn = DriverManager.getConnection("jdbc:h2:file:G:/hs_temp/h2_db/test", "sa", "sa");
        } catch (SQLException e) {
            e.printStackTrace();
        }
        createPaginationButtons(conn);
    }

    private static void createPaginationButtons(Connection conn) throws SQLException {
        Statement stmt = conn.createStatement();
        ResultSet rs = stmt.executeQuery("SELECT count(*) FROM cdr");
        while (rs.next()) {
            JOptionPane.showMessageDialog(null, rs.getInt(1)); 
            totalRows = rs.getInt(1);
        }
        int v = totalRows % recordPerPage == 0 ? 0 : 1;
        totalPages = totalRows / recordPerPage + v;
        createButton(totalPages);

    }

    private static void createButton(int totalPages) {
        JOptionPane.showMessageDialog(null, totalPages);
        for(int i = 0; i < totalPages;) {
            buttons = new JButton(""+(i+1) );
            //JOptionPane.showMessageDialog(null, buttons);
            panel.add(buttons);
            i++;
        }


    }

}

任何想法，怎么做？

在java swing中从另一个方法访问Jpanel

0 个答案: