Question

所以这个问题问了很多，但是我搜索了其中的几个，似乎每个人都忘记了将面板添加到框架中。我已将面板添加到框架中，但是仍然看不到JPanel。

public class AddSomethingFrame extends JFrame{
private JFrame application;
JPanel viewPanel = new JPanel();

    public AddSomethingFrame(JFrame application) {
        super("Add");
        this.application = application;

        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setPreferredSize(new Dimension(300, 200));
        placeComponents(viewPanel);
        viewPanel.setBorder(new EmptyBorder(13, 25, 13, 25));
        setLayout(new FlowLayout());
        setLocationRelativeTo(null);
        setResizable(true);
        pack();
        setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);
        this.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                application.setVisible(true);
                setVisible(false);
                dispose();
            }
        });
        setVisible(true);
    }

    private void placeComponents (JPanel panel) {

        panel.setLayout(null);
        JLabel nameLabel = new JLabel("Name");
        nameLabel.setBounds(10, 10, 80, 25);
        panel.add(nameLabel);

        JTextField nameText = new JTextField(20);
        nameText.setBounds(100, 10, 160, 25);
        panel.add(nameText);

        JLabel brandLabel = new JLabel("Brand");
        brandLabel.setBounds(10, 40, 80, 25);
        panel.add(brandLabel);

        JTextField brandText = new JTextField(20);
        brandText.setBounds(100, 40, 160, 25);
        panel.add(brandText);

        JLabel costLabel = new JLabel("Cost");
        costLabel.setBounds(10, 10, 80, 25);
        panel.add(costLabel);

        JTextField costText = new JTextField(20);
        costText.setBounds(100, 10, 160, 25);
        panel.add(costText);


        JButton storeGearButton = new JButton("Store");
        storeGearButton.setBounds(10, 80, 80, 25);
        panel.add(storeGearButton);

        this.add(viewPanel, BorderLayout.NORTH);
    }

}

我已经尝试过为JFrame和JPanel设置setVisible。我尝试更改每个面板的大小，并尝试更改面板的BorderLayout，但是没有任何效果。请帮忙。

Answer 1

我建议您避免使用“ placeComponents（viewPanel）”构造，而应将“ JPanle panel”元素直接添加到JFrame中，这将使您的代码更容易。像这样的东西：

public class AddSomethingFrame extends JFrame{
static JFrame application;
//JPanel viewPanel = new JPanel();

public AddSomethingFrame(JFrame application) {
super("Add");
//    this.application = application;

setBounds(300, 200, 1000, 200);
setDefaultCloseOperation(EXIT_ON_CLOSE);
//    placeComponents(viewPanel);
//    viewPanel.setBorder(new EmptyBorder(10, 25, 2, 25));
//    setLayout(new FlowLayout());
//    setLocationRelativeTo(null);
//    setResizable(true);
//    pack();
//    setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);
//    this.addWindowListener(new WindowAdapter() {
//        public void windowClosing(WindowEvent e) {
//            application.setVisible(true);
//            setVisible(false);
//            dispose();
//        }
//    });
//    setVisible(true);
//}
//
//    private void placeComponents (JPanel panel) {
JPanel panel = new JPanel();
//        panel.setLayout(null);
    JLabel nameLabel = new JLabel("Name");
    nameLabel.setBounds(10, 10, 80, 25);
    panel.add(nameLabel);

    JTextField nameText = new JTextField(20);
    nameText.setBounds(100, 10, 160, 25);
    panel.add(nameText);

    JLabel brandLabel = new JLabel("Brand");
    brandLabel.setBounds(10, 40, 80, 25);
    panel.add(brandLabel);

    JTextField brandText = new JTextField(20);
    brandText.setBounds(100, 40, 160, 25);
    panel.add(brandText);

    JLabel costLabel = new JLabel("Cost");
    costLabel.setBounds(10, 10, 80, 25);
    panel.add(costLabel);

    JTextField costText = new JTextField(20);
    costText.setBounds(100, 10, 160, 25);
    panel.add(costText);


    JButton storeGearButton = new JButton("Store");
    storeGearButton.setBounds(10, 80, 80, 25);
    panel.add(storeGearButton);

    this.add(panel, BorderLayout.NORTH);
}
public static void main(String[] args) {

    AddSomethingFrame app= new AddSomethingFrame(application);
    app.setVisible(true);
   }
}

我已经将JPanel添加到JFrame，但它仍然没有显示

1 个答案: