Question

我试图创建一个密码库，但是每当我尝试运行它时，JTextField都非常小，JTable覆盖了面板。

我尝试使用GridBag的尺寸和位置，但没有任何效果。

这是给我的IB计算机科学IA的。任何帮助都会很棒。

    JFrame passwordVault;
    JTable passwordTable;
    Object[] columnNames = {"Name of Application", "Application Password", "Description"};
    JTextField appName, appPass, appDesc;
    JButton add, delete, update;
    JLabel nameOfApp, passOfApp, descOfApp;

    passwordVault = new JFrame("Password Vault");
    passwordTable = new JTable();
    JPanel passwordPanel = new JPanel();

    DefaultTableModel tableModel = new DefaultTableModel();
    tableModel.setColumnIdentifiers(columnNames);
    passwordTable.setModel(tableModel);

    nameOfApp = new JLabel("App Name: ");
    passOfApp = new JLabel("App Password: ");
    descOfApp = new JLabel("Description: ");    

    appName = new JTextField();
    appPass = new JTextField();
    appDesc = new JTextField();

    add = new JButton("Add");
    delete = new JButton("Delete");
    update = new JButton("Update");  

    appName.setBounds(400, 220, 100, 25);
    appPass.setBounds(400, 250, 100, 25);
    appDesc.setBounds(400, 280, 100, 25);

    add.setBounds(530, 220, 100, 25);
    update.setBounds(530, 250, 100, 25);
    delete.setBounds(530, 280, 100, 25);

    JScrollPane scrollPane = new JScrollPane(passwordTable);
    scrollPane.setBounds(0, 0, 1000, 200);
    passwordVault.add(scrollPane);

    passwordPanel.add(add);
    passwordPanel.add(update);
    passwordPanel.add(delete);

    passwordPanel.setLayout(new GridBagLayout());

    passwordPanel.add(nameOfApp, new GridBagConstraints(0, 0, 1, 1, 0.0, 0.0,
        GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 0, 0));
    passwordPanel.add(appName, new GridBagConstraints(1, 0, 1, 1, 0.0, 0.0,
        GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL, new Insets(0, 0, 0, 0), 0, 0));
    passwordPanel.add(passOfApp, new GridBagConstraints(0, 1, 1, 1, 0.0, 0.0,
        GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 0, 0));
    passwordPanel.add(appPass, new GridBagConstraints(1, 1, 1, 1, 0.0, 0.0,
        GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL, new Insets(0, 0, 0, 0), 0, 0));
    passwordPanel.add(descOfApp, new GridBagConstraints(0, 2, 1, 1, 0.0, 0.0,
        GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 0, 0));
    passwordPanel.add(appDesc, new GridBagConstraints(2, 2, 1, 1, 0.0, 0.0,
        GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL, new Insets(0, 0, 0, 0), 0, 0));
    passwordPanel.add(add, new GridBagConstraints(3, 3, 1, 1, 0.0, 0.0,
            GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL, new Insets(0, 0, 0, 0), 0, 0));
    passwordPanel.add(update, new GridBagConstraints(4, 3, 1, 1, 0.0, 0.0,
            GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL, new Insets(0, 0, 0, 0), 0, 0));
    passwordPanel.add(delete, new GridBagConstraints(5, 3, 1, 1, 0.0, 0.0,
            GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL, new Insets(0, 0, 0, 0), 0, 0));

    passwordVault.add(passwordPanel);
    passwordVault.setSize(1000,500);
    passwordVault.setLocationRelativeTo(null);
    passwordVault.setVisible(true);

Answer 1

这是程序的编辑版本，它按照我认为的方式格式化布局：

        JFrame passwordVault;
        JTable passwordTable;
        Object[] columnNames = {"Name of Application", "Application Password", "Description"};
        JTextField appName, appPass, appDesc;
        JButton add, delete, update;
        JLabel nameOfApp, passOfApp, descOfApp;

        passwordVault = new JFrame("Password Vault");
        passwordTable = new JTable();
        JPanel passwordPanel = new JPanel();

        DefaultTableModel tableModel = new DefaultTableModel();
        tableModel.setColumnIdentifiers(columnNames);
        passwordTable.setModel(tableModel);

        nameOfApp = new JLabel("App Name: ");
        passOfApp = new JLabel("App Password: ");
        descOfApp = new JLabel("Description: ");    

        appName = new JTextField();
        appPass = new JTextField();
        appDesc = new JTextField();

        add = new JButton("Add");
        delete = new JButton("Delete");
        update = new JButton("Update");  

        // Used setPreferredSize and setLocation instead of setBounds
        appName.setLocation(new Point(400, 220));
        appName.setPreferredSize(new Dimension(100, 25));
        appPass.setLocation(new Point(400, 250));
        appPass.setPreferredSize(new Dimension(100, 25));
        appDesc.setLocation(new Point(400, 280));
        appDesc.setPreferredSize(new Dimension(100, 25));

        add.setLocation(new Point(530, 220));
        add.setPreferredSize(new Dimension(100, 25));
        update.setLocation(new Point(530, 250));
        update.setPreferredSize(new Dimension(100, 25));
        delete.setLocation(new Point(530, 280));
        delete.setPreferredSize(new Dimension(100, 25));

        JScrollPane scrollPane = new JScrollPane(passwordTable);
        scrollPane.setBounds(0, 0, 1000, 200);

        // Create a JPanel to contain the scrollPane and passwordPanel
        JPanel framePanel = new JPanel();
        framePanel.setLayout(new GridLayout(2, 1));

        framePanel.add(scrollPane);

        passwordPanel.setLayout(new GridBagLayout());

        passwordPanel.add(nameOfApp, new GridBagConstraints(0, 0, 1, 1, 0.0, 0.0,
            GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 0, 0));
        passwordPanel.add(appName, new GridBagConstraints(1, 0, 1, 1, 0.0, 0.0,
            GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL, new Insets(0, 0, 0, 0), 0, 0));
        passwordPanel.add(passOfApp, new GridBagConstraints(0, 1, 1, 1, 0.0, 0.0,
            GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 0, 0));
        passwordPanel.add(appPass, new GridBagConstraints(1, 1, 1, 1, 0.0, 0.0,
            GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL, new Insets(0, 0, 0, 0), 0, 0));
        passwordPanel.add(descOfApp, new GridBagConstraints(0, 2, 1, 1, 0.0, 0.0,
            GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 0, 0));
        passwordPanel.add(appDesc, new GridBagConstraints(1, 2, 1, 1, 0.0, 0.0,
            GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL, new Insets(0, 0, 0, 0), 0, 0));
        passwordPanel.add(add, new GridBagConstraints(0, 3, 1, 1, 0.0, 0.0,
                GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL, new Insets(0, 0, 0, 0), 0, 0));
        passwordPanel.add(update, new GridBagConstraints(1, 3, 1, 1, 0.0, 0.0,
                GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL, new Insets(0, 0, 0, 0), 0, 0));
        passwordPanel.add(delete, new GridBagConstraints(2, 3, 1, 1, 0.0, 0.0,
                GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL, new Insets(0, 0, 0, 0), 0, 0));

        framePanel.add(passwordPanel);

        // Add the framePanel (which contains the other 2 panels) to the JFrame
        passwordVault.add(framePanel);

        passwordVault.setSize(1000,500);
        passwordVault.setLocationRelativeTo(null);
        passwordVault.setVisible(true);

因此，主要更改是：

使用setPreferredSize和setLocation，而不是setBounds和JTextField的{{1}}
创建了一个主JButton（称为JPanel）以包含framePanel和scrollPane，然后将passwordPanel添加到framePanel

通过创建主JFrame而不是仅向JFrame本身添加多个JPanel来帮助组织JPanel中的不同元素。这样，一个主JFrame决定了框架的整体布局。

如何正确定位JButton和设置JTextField的大小？

1 个答案: