Java GUI GridBagLayout布局生成的組件太小

public class TestDemo {

    public static void main(String[] args) {

        JFrame frame = new JFrame("我的表單");

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.setSize(640, 640);

        JPanel panel = new JPanel();

        panel.setSize(640,640);

        frame.setResizable(false);

        frame.setLocationRelativeTo(null);

        GridBagLayout gridBagLayout = new GridBagLayout();

        panel.setLayout(gridBagLayout);

        GridBagConstraints constraints = new GridBagConstraints();

        constraints.fill = GridBagConstraints.BOTH;

        constraints.gridx = 1;

        constraints.gridy = 2;

        constraints.gridwidth = 3;

        constraints.gridheight = 3;

        JTextArea textArea = new JTextArea("文本區");

        gridBagLayout.setConstraints(textArea, constraints);

        constraints.gridx = 4;

        constraints.gridy = 2;

        constraints.gridwidth = 1;

        constraints.gridheight = 1;

        JButton buttonConfirm = new JButton("確定");

        gridBagLayout.setConstraints(buttonConfirm, constraints);

        constraints.gridx = 5;

        constraints.gridy = 2;

        constraints.gridwidth = 2;

        constraints.gridheight = 1;

        JButton buttonCancel = new JButton("取消");

        gridBagLayout.setConstraints(buttonCancel, constraints);

        ButtonGroup group = new ButtonGroup();

        constraints.gridx = 4;

        constraints.gridy = 3;

        constraints.gridwidth = 1;

        constraints.gridheight = 1;

        JRadioButton buttonBold = new JRadioButton("粗體");

        gridBagLayout.setConstraints(buttonBold, constraints);

        constraints.gridx = 5;

        constraints.gridy = 3;

        constraints.gridwidth = 2;

        constraints.gridheight = 1;

        JRadioButton buttonItalic = new JRadioButton("斜體");

        gridBagLayout.setConstraints(buttonItalic, constraints);

        constraints.gridx = 4;

        constraints.gridy = 4;

        constraints.gridwidth = 2;

        constraints.gridheight = 1;

        JRadioButton buttonCommon = new JRadioButton("常規");

        gridBagLayout.setConstraints(buttonCommon, constraints);

        constraints.gridx = 5;

        constraints.gridy = 4;

        constraints.gridwidth = 2;

        constraints.gridheight = 1;

        JRadioButton buttonBoldItalic = new JRadioButton("粗體/斜體");

        gridBagLayout.setConstraints(buttonBoldItalic, constraints);

        constraints.gridx = 1;

        constraints.gridy = 5;

        constraints.gridwidth = 6;

        constraints.gridheight = 1;

        JTextField textField = new JTextField("輸入你的姓名");

        gridBagLayout.setConstraints(textField, constraints);

        group.add(buttonBold);

        group.add(buttonItalic);

        group.add(buttonCommon);

        group.add(buttonBoldItalic);

        panel.add(textArea);

        panel.add(buttonConfirm);

        panel.add(buttonCancel);

        panel.add(buttonBold);

        panel.add(buttonItalic);

        panel.add(buttonCommon);

        panel.add(buttonBoldItalic);

        panel.add(textField);

        frame.add(panel);

        frame.setVisible(true);

    }

}

標籤：Java SE

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