Question

所以我以intellij的形式创建了一个gui，当我取出与表有关的代码时，它确实是我想要的，但是当我将所有代码放入表中时，便得到了表本身。我在使用gui表单本身添加列时遇到了麻烦，并找到了一个教程，展示如何使用代码添加列等。我如何能够向表中添加行和/或将表置于表单上

public class App extends JFrame{
    private JButton createRecordButton;
    private JPanel panel1;
    private JPanel east;
    private JPanel west;
    private JPanel south;
    private JButton deleteRecordButton;
    private JButton viewStatisticsButton;
    private JButton downloadDataButton;
    public JTable TestDB;



    public App() {

    }

    public static void main(String[] args) {
        JFrame frame=new JFrame("App");
        frame.setContentPane(new App().panel1);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setVisible(true);

        table gui=new table();
        gui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        gui.setSize(600,200);
        gui.setVisible(true);
        gui.setTitle("The DataBase Table");




    }
}

Answer 1

您正在以下行中生成异常：frame.setContentPane（new App（）。panel1）; 请注意，您创建了App对象，但是panel1对象仍然为null。使用此代码，您将看到两个JFrame都将出现：

public class App extends JFrame{
private JButton createRecordButton;
private JPanel panel1;
private JPanel east;
private JPanel west;
private JPanel south;
private JButton deleteRecordButton;
private JButton viewStatisticsButton;
private JButton downloadDataButton;
public JTable TestDB;



public App() {
    panel1 = new JPanel();
}

public static void main(String[] args) {
    JFrame frame=new JFrame("App");
    frame.setContentPane(new App().panel1);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.pack();
    frame.setVisible(true);

    JFrame gui=new JFrame();
    gui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    gui.setSize(600,200);
    gui.setVisible(true);
    gui.setTitle("The DataBase Table");




}

}

无法同时显示我的JFrame和表格

1 个答案: