TestGridBagLayout5.java

/*
    TestGridBagLayout5.java
    CIS 260
    2/22/2006
    David Klick

Demonstration of GridBagLayout using weightx and
    weighty. The effect is most noticeable as the frame
    is made wider.
*/

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class TestGridBagLayout5 extends JFrame {
    public static void main(String[] args) {
        TestGridBagLayout5 app = new TestGridBagLayout5();
        app.setDefaultCloseOperation(EXIT_ON_CLOSE);
        app.init();
    }

public void init() {
        int i;
        JButton btn[] = new JButton[4];
        Container c = getContentPane();
        c.setLayout(new GridBagLayout());
        GridBagConstraints gb = new GridBagConstraints();

for (i=0; i<btn.length; i++) {
            btn[i] = new JButton("Button #" + (i+1));
        }

gb.fill = GridBagConstraints.BOTH;
        gb.insets = new Insets(2, 2, 2, 2);
        gb.weightx = 1.0; gb.weighty = 1.0;
        gb.gridheight = 2;
        gb.gridwidth = 2;
        gb.gridx = 0; gb.gridy = 0;
        c.add(btn[0], gb);
        gb.weightx = 0.5; gb.weighty = 1.0;
        gb.gridheight = 1;
        gb.gridwidth = 1;
        gb.gridx = 2; gb.gridy = 0;
        c.add(btn[1], gb);
        gb.weightx = 0.5; gb.weighty = 1.0;
        gb.gridx = 2; gb.gridy = 1;
        c.add(btn[2], gb);
        gb.weightx = 1.0; gb.weighty = 0.5;
        gb.gridheight = 1;
        gb.gridwidth = 3;
        gb.gridx = 0; gb.gridy = 2;
        c.add(btn[3], gb);

setSize(200, 200);
        setVisible(true);      
    }
}