gridbaglayout中的权重不正确

Question

I want to make a GUI in Java, using GridBagLayout. This is what I want in the end :

Therefore, I followed some instructions I found on the Internet, and here is the code I wrote :

    Panel panel = new Panel();
    panel.setLayout(new GridBagLayout());
    GridBagConstraints gc = new GridBagConstraints();
    gc.fill = GridBagConstraints.BOTH;
    gc.insets = new Insets(5, 5, 5, 5);
    gc.weightx = 7;
    gc.weighty = 7;
    panel.add(new JLabel("title"), gc, 0, 0, 2, 1);
    panel.add(new JButton("button 1"), gc, 2, 0, 1, 1);
    panel.add(new JButton("button 2"), gc, 3, 0, 1, 1);
    panel.add(new JButton("button 3"), gc, 4, 0, 1, 1);
    panel.add(new JButton("button 4"), gc, 5, 0, 1, 1);
    panel.add(new JButton("button 5"), gc, 6, 0, 1, 1);
    panel.add(new JLabel("subtitle"), gc, 0, 1, 7, 1);   
    panel.add(new JButton("list"), gc, 0, 2, 2, 4);  
    panel.add(new JButton("button"), gc, 0, 6, 1, 1);    
    panel.add(new JButton("button"), gc, 1, 6, 1, 1);
    panel.add(new JButton("table"), gc, 2, 2, 5, 5);

My function add :

public void add(Component component, GridBagConstraints constraints, int x, int y, int width, int height) {
    constraints.gridx = x;
    constraints.gridy = y;
    constraints.gridwidth = width;
    constraints.gridheight = height;
    this.add(component, constraints);
}

But, I have this in the end :

As you can see, the table does not take 5 cells in height at all, and the list does not take 4 cells. Does anybody know why it acts like this ? Thank you.

Answer 1

It should work if you add:

    constraints.weightx = (double) width / 7.0;
    constraints.weighty = (double) height / 7.0;

to your add method.