如何正确定位 JButtons 和大小 JTextFields？

Question

我正在尝试创建一个密码库，但每当我尝试运行它时，JTextFields 都非常小，并且面板有点被JTable.我尝试过使用尺寸和位置，GridBag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());

Answer 1

这是您的程序的编辑版本，它按照我认为您尝试的方式格式化布局：

        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，主要变化是：

1. 使用setPreferredSizeandsetLocation代替ssetBounds和sJTextFieldJButton

2. 创建了一个 main JPanel（称为 it framePanel）来包含scrollPaneand passwordPanel，然后添加framePanel到JFrame

JFrame它通过创建一个 main来帮助组织 a 中的不同元素，而不是仅仅向自身JPanel添加多个JPanels 。JFrame这样，一个主要JPanel的决定框架的整体布局。