Java Swing Tutorials - Herong's Tutorial Examples - Version 4.11, by Dr. Herong Yang
java.awt.GridBagLayout - Grid Bag Layout
This section provides a tutorial example on how to create a GridBagLayout to layout components in a container. GridBagLayout can have many elements arranged in predefined rows and columns with non-equal sizes.
java.awt.GridBagLayout - A more complex layout that:
Once again, I wrote another program to try to display my window with GridBagLayout:
/* GridBagLayoutTest2.java * Copyright (c) 2014, HerongYang.com, All Rights Reserved. */ import java.awt.*; import javax.swing.*; public class GridBagLayoutTest2 { public static void main(String[] a) { JFrame myFrame = new JFrame("GridBagLayout Test"); myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Container myPane = myFrame.getContentPane(); myPane.setLayout(new GridBagLayout()); GridBagConstraints c = new GridBagConstraints(); setMyConstraints(c,0,0,GridBagConstraints.CENTER); myPane.add(getFieldPanel(),c); setMyConstraints(c,0,1,GridBagConstraints.CENTER); myPane.add(getButtonPanel(),c); myFrame.pack(); myFrame.setVisible(true); } private static JPanel getFieldPanel() { JPanel p = new JPanel(new GridBagLayout()); p.setBorder(BorderFactory.createTitledBorder("Details")); GridBagConstraints c = new GridBagConstraints(); setMyConstraints(c,0,0,GridBagConstraints.EAST); p.add(new JLabel("Name:"),c); setMyConstraints(c,1,0,GridBagConstraints.WEST); p.add(new JTextField(16),c); setMyConstraints(c,0,1,GridBagConstraints.EAST); p.add(new JLabel("System:"),c); setMyConstraints(c,1,1,GridBagConstraints.WEST); p.add(getSystemPanel(),c); setMyConstraints(c,0,2,GridBagConstraints.EAST); p.add(new JLabel("Language:"),c); setMyConstraints(c,1,2,GridBagConstraints.WEST); p.add(getLanguagePanel(),c); setMyConstraints(c,0,3,GridBagConstraints.EAST); p.add(new JLabel("Year:"),c); setMyConstraints(c,1,3,GridBagConstraints.WEST); p.add(new JComboBox<String>( new String[] {"2021","2022","2023"}),c); return p; } private static JPanel getButtonPanel() { JPanel p = new JPanel(new GridBagLayout()); 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 GridBagLayout()); p.add(unixButton); p.add(winButton); return p; } private static JPanel getLanguagePanel() { JPanel p = new JPanel(new GridBagLayout()); p.add(new JCheckBox("Java",true)); p.add(new JCheckBox("C++",true)); p.add(new JCheckBox("Perl",false)); return p; } private static void setMyConstraints(GridBagConstraints c, int gridx, int gridy, int anchor) { c.gridx = gridx; c.gridy = gridy; c.anchor = anchor; } }
Run it. What do you think about the result? Almost perfect, right?
All components are aligned correctly in both directions now. And all components are properly sized.
GridBagLayout seems to be good enough for my example.
Sample programs listed in this section have been tested with JDK 1.6.0 to 1.8.0.
Last update: 2014.
Table of Contents
Introduction of Java Swing Package
Graphics Environment of the Local System
JRadioButton - Swing Radio Button Class
JTextField - Swing Text Field Class
Menu Bar, Menus, Menu Items and Listeners
Creating Internal Frames inside the Main Frame
►Layout of Components in a Container
java.awt.BorderLayout - Border Layout
java.awt.FlowLayout - Flow Layout
java.awt.BoxLayout - Box Layout
java.awt.GridLayout - Grid Layout
►java.awt.GridBagLayout - Grid Bag Layout
JEditorPane - The Editor Pane Class