Which LayoutManager for this topic

Question

Hi there!
I'm trying to arrange 3 JPanels in a JFrame like this:
+------------------------+----------+
|  panel1                | panel2   |
+------------------------+----------+
|                                   |
|  panel3                           |
|                                   |
|                                   |
+-----------------------------------+On a resize, I want to maintain the relative size of the single panels, e.g.:
panel1.height = 1/4 of frame.height
panel3.height = 3/4 of frame.height
and the same for the widths of panel1 and panel2.
What layoutmanager would you recommend?

Answer 1

package gui1;
* LayoutDemo.java
import java.awt.*;
import javax.swing.*;
public class LayoutDemo extends JFrame {
    private JPanel jPanel1, jPanel2, jPanel3, jPanel4;
    public LayoutDemo() {
        super("Layout Demo");
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setSize(400,300);
        setLocationRelativeTo(null);
        GridBagConstraints gridBagConstraints;
        jPanel1 = new JPanel();
        jPanel2 = new JPanel();
        jPanel3 = new JPanel();
        jPanel4 = new JPanel();
        jPanel1.setLayout(new GridBagLayout());
        jPanel2.setBackground(new Color(255, 255, 204));
        gridBagConstraints = new GridBagConstraints();
        gridBagConstraints.gridwidth = 2;
        gridBagConstraints.fill = GridBagConstraints.BOTH;
        gridBagConstraints.weightx = 2.0;
        gridBagConstraints.weighty = 1.0;
        jPanel1.add(jPanel2, gridBagConstraints);
        jPanel3.setBackground(new Color(204, 204, 255));
        gridBagConstraints = new GridBagConstraints();
        gridBagConstraints.fill = GridBagConstraints.BOTH;
        gridBagConstraints.weightx = 1.0;
        gridBagConstraints.weighty = 1.0;
        jPanel1.add(jPanel3, gridBagConstraints);
        jPanel4.setBackground(new Color(255, 204, 204));
        gridBagConstraints = new GridBagConstraints();
        gridBagConstraints.gridx = 0;
        gridBagConstraints.gridy = 1;
        gridBagConstraints.gridwidth = 3;
        gridBagConstraints.gridheight = 3;
        gridBagConstraints.fill = GridBagConstraints.BOTH;
        gridBagConstraints.weightx = 3.0;
        gridBagConstraints.weighty = 3.0;
        jPanel1.add(jPanel4, gridBagConstraints);
        getContentPane().add(jPanel1, BorderLayout.CENTER);
    public static void main(final String args[]) {new LayoutDemo().setVisible(true);}
}Message was edited by:
Andre_Uhres