使用GridLayout的Java问题

Question

我希望有一个像这样结构的3x3网格布局:

 _ _ _ _ _ _ _ _ _ _ _ _
|        Label         |
| Button Button Button |
|       TextArea       |
|_ _ _ _ _ _ _ _ _ _ _ |

但布局被打破了.

    public static void main(String[] args){
    JFrame frame = new JFrame("title");
    frame.setSize(400,500);
    frame.setVisible(true);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    GridLayout layout = new GridLayout(3,3);

    JPanel pan0 = new JPanel();
    JPanel pan1 = new JPanel();
    JPanel pan2 = new JPanel();

    pan0.setLayout(layout);
    GridBagConstraints c = new GridBagConstraints();

    JLabel title = new JLabel("title");
    title.setFont(new Font("Serif", Font.BOLD, 40));
    c.gridx = 0;
    c.gridy = 0;
    c.gridwidth = 3;
    pan0.add(title, c);

    JButton b1 = new JButton("button1");
    c.gridx = 0;
    c.gridy = 1;
    c.gridwidth = 1;
    pan0.add(b1, c);

    JButton b2 = new JButton("button2");
    c.gridx = 1;
    c.gridy = 2;
    c.gridwidth = 1;
    pan0.add(b2, c);

    JButton b3 = new JButton("button3");
    c.gridx = 2;
    c.gridy = 3;
    c.gridwidth = 1;
    pan0.add(b3, c);    

    TextArea text1 = new TextArea(15,40);
    c.gridx = 2;
    c.gridy = 0;
    c.gridwidth = 3;
    pan0.add(text1, c);

    frame.add(pan0);
    frame.pack();

  }
}

Answer 1

你正在使用GridBagConstraintaGridLayout

而是GridBagLayout在相同的包装中使用它