This section provides a tutorial example on how to create a GridLayout to layout components in a container. GridLayout can have many elements arranged in predefined rows and columns.
java.awt.GridLayout - A layout that:
Divides the container into rows and columns. The number of rows and
the number of columns are configurable. Rows and columns are equally
divided.
Places components into the specified cells.
Resizes each component to match the size of its cell.
Resizes all components when the container is resized.
Again, I wrote another program to try to display my window with GridLayout:
/**
* GridLayoutTest.java
* Copyright (c) 2002 by Dr. Herong Yang, http://www.herongyang.com/
*/
import java.awt.*;
import javax.swing.*;
public class GridLayoutTest {
public static void main(String[] a) {
JFrame myFrame = new JFrame("Layout Test 1");
myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container myPane = myFrame.getContentPane();
myPane.setLayout(new GridLayout(2,1));
myPane.add(getFieldPanel());
myPane.add(getButtonPanel());
myFrame.pack();
myFrame.setVisible(true);
}
private static JPanel getFieldPanel() {
JPanel p = new JPanel(new GridLayout(4,2));
p.setBorder(BorderFactory.createTitledBorder("Details"));
p.add(new JLabel("Name:",SwingConstants.RIGHT));
p.add(new JTextField(16));
p.add(new JLabel("System:",SwingConstants.RIGHT));
p.add(getSystemPanel());
p.add(new JLabel("Language:",SwingConstants.RIGHT));
p.add(getLanguagePanel());
p.add(new JLabel("Year:",SwingConstants.RIGHT));
p.add(new JComboBox(new String[] {"2001","2002","2003"}));
return p;
}
private static JPanel getButtonPanel() {
JPanel p = new JPanel(new GridLayout(1,2));
p.add(new JButton("OK"));
p.add(new JButton("Cancel"));
return p;
}
private static JPanel getSystemPanel() {
JRadioButton unixButton = new JRadioButton("Unix",true);
JRadioButton winButton = new JRadioButton("Window",false);
ButtonGroup systemGroup = new ButtonGroup();
systemGroup.add(unixButton);
systemGroup.add(winButton);
JPanel p = new JPanel(new GridLayout(1,2));
p.add(unixButton);
p.add(winButton);
return p;
}
private static JPanel getLanguagePanel() {
JPanel p = new JPanel(new GridLayout(1,3));
p.add(new JCheckBox("Java",true));
p.add(new JCheckBox("C++",true));
p.add(new JCheckBox("Perl",false));
return p;
}
}
Run it. What do you think about the result? You don't like it, right?
All components are aligned correctly in both directions now. But
all components are having wrong sizes.
So, GridLayout is still not good for my example.
Sample programs listed in this section have been tested with JDK 1.3.1, 1.4.1, 1.5.0, and 1.6.0.
