Java GridBagLayout not working

Question

I\'m trying to use GridBagLayout, but I don\'t get what I expect and I can\'t find the error in this code:

public class GridBagEx1 extends JPanel {
         


        

Answer 1

I managed to design the needed layout without any hack and supporting dynamic resizing by using JGoodies FormLayout:

import java.awt.Component;

import javax.swing.JButton;
import javax.swing.JPanel;

import com.jgoodies.forms.factories.FormFactory;
import com.jgoodies.forms.layout.ColumnSpec;
import com.jgoodies.forms.layout.FormLayout;
import com.jgoodies.forms.layout.RowSpec;

public class FormLayoutPanel extends JPanel
    {
    public FormLayoutPanel()
        {
        setAlignmentY( Component.BOTTOM_ALIGNMENT );
        setAlignmentX( Component.RIGHT_ALIGNMENT );
        setLayout( new FormLayout( new ColumnSpec[] {
            ColumnSpec.decode( "41px:grow" ),
            FormFactory.LABEL_COMPONENT_GAP_COLSPEC,
            ColumnSpec.decode( "25px:grow" ),
            FormFactory.LABEL_COMPONENT_GAP_COLSPEC,
            ColumnSpec.decode( "41px:grow" ),
            FormFactory.LABEL_COMPONENT_GAP_COLSPEC,
            ColumnSpec.decode( "41px:grow" ),
            FormFactory.LABEL_COMPONENT_GAP_COLSPEC,
            ColumnSpec.decode( "41px:grow" ), },
            new RowSpec[] {
                RowSpec.decode( "25px:grow" ),
                FormFactory.LINE_GAP_ROWSPEC,
                RowSpec.decode( "25px:grow" ),
                FormFactory.LINE_GAP_ROWSPEC,
                RowSpec.decode( "25px:grow" ), } ) );

        JButton button1 = new JButton( "1" );
        add( button1, "1, 1, 3, 1, fill, fill" );
        JButton button2 = new JButton( "2" );
        add( button2, "5, 1, fill, fill" );
        JButton button3 = new JButton( "3" );
        add( button3, "7, 1, 3, 3, fill, fill" );
        JButton button4 = new JButton( "4" );
        add( button4, "1, 3, fill, fill" );
        JButton button5 = new JButton( "5" );
        add( button5, "3, 3, 3, 1, fill, fill" );
        JButton button6 = new JButton( "6" );
        add( button6, "1, 5, fill, fill" );
        JButton button7 = new JButton( "7" );
        add( button7, "3, 5, 3, 1, fill, fill" );
        JButton button8 = new JButton( "8" );
        add( button8, "7, 5, fill, fill" );
        JButton button9 = new JButton( "9" );
        add( button9, "9, 5, fill, fill" );
        }
    }