Java by API/java.awt/GridBagConstraints

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GridBagConstraints.BOTH

   <source lang="java">

import java.awt.Container; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.Insets; import javax.swing.BorderFactory; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.border.Border; public class MainClass {

 public static void main(String[] args) {
   JFrame aWindow = new JFrame();
   aWindow.setBounds(200, 200, 200, 200);
   aWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   Container content = aWindow.getContentPane();
   content.add(new GridBagLayoutPanel());
   aWindow.setVisible(true);
 }

} class GridBagLayoutPanel extends JPanel {

 public GridBagLayoutPanel() {
   GridBagLayout gridbag = new GridBagLayout();
   GridBagConstraints constraints = new GridBagConstraints();
   setLayout(gridbag);
   constraints.weightx = constraints.weighty = 10.0;
   constraints.fill = constraints.NONE;
   constraints.ipadx = 30;
   constraints.ipady = 10;
   addButton("Press", constraints, gridbag);
   constraints.weightx = 5.0;
   constraints.fill = constraints.BOTH;
   constraints.ipadx = constraints.ipady = 0;
   constraints.insets = new Insets(10, 30, 10, 20);
   constraints.gridwidth = constraints.RELATIVE;
   constraints.gridheight = 2;
   addButton("GO", constraints, gridbag);
   constraints.insets = new Insets(0, 0, 0, 0);
   constraints.gridx = 0;
   constraints.fill = constraints.NONE;
   constraints.ipadx = 30;
   constraints.ipady = 10;
   constraints.gridwidth = 1;
   constraints.gridheight = 1;
   addButton("Push", constraints, gridbag);
 }
 private void addButton(String label, GridBagConstraints constraints,
     GridBagLayout layout) {
   Border edge = BorderFactory.createRaisedBevelBorder();
   JButton button = new JButton(label);
   button.setBorder(edge);
   layout.setConstraints(button, constraints);
   add(button);
 }

}


 </source>
   
  
 
  



GridBagConstraints.CENTER

   <source lang="java">

import java.awt.ruponent; import java.awt.Container; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.Insets; import javax.swing.JButton; import javax.swing.JFrame; public class MainClass {

 public static void main(String[] a) {
   final JFrame frame = new JFrame("GridBagLayout");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.setLayout(new GridBagLayout());
   JButton button;
   button = new JButton("One");
   addComponent(frame, button, 0, 0, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
   button = new JButton("Two");
   addComponent(frame, button, 1, 0, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
   button = new JButton("Three");
   addComponent(frame, button, 0, 1, 2, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
   button = new JButton("Four");
   addComponent(frame, button, 0, 2, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
   frame.setSize(500, 200);
   frame.setVisible(true);
 }
 private static void addComponent(Container container, Component component, int gridx, int gridy,
     int gridwidth, int gridheight, int anchor, int fill) {
   Insets insets = new Insets(0,0,0,0);
   GridBagConstraints gbc = new GridBagConstraints(gridx, gridy, gridwidth, gridheight, 1.0, 1.0,
       anchor, fill, insets, 0, 0);
   container.add(component, gbc);
 }

}


 </source>
   
  
 
  



GridBagConstraints.fill

   <source lang="java">

import java.awt.ruponent; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class MainClass extends JPanel {

 GridBagConstraints constraints = new GridBagConstraints();
 public MainClass() {
   setLayout(new GridBagLayout());
   constraints.weightx = 1.0;
   constraints.weighty = 1.0;
   constraints.fill = GridBagConstraints.BOTH;
   int x, y; // for clarity
   addGB(new JButton("North"), x = 1, y = 0);
   addGB(new JButton("West"), x = 0, y = 1);
   addGB(new JButton("Center"), x = 1, y = 1);
   addGB(new JButton("East"), x = 2, y = 1);
   addGB(new JButton("South"), x = 1, y = 2);
 }
 void addGB(Component component, int x, int y) {
   constraints.gridx = x;
   constraints.gridy = y;
   add(component, constraints);
 }
 public static void main(String[] args) {
   JFrame frame = new JFrame("MainClass");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.setSize(225, 150);
   frame.setLocation(200, 200);
   frame.setContentPane(new MainClass());
   frame.setVisible(true);
 }

}


 </source>
   
  
 
  



GridBagConstraints.gridheight

   <source lang="java">

import java.awt.ruponent; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class MainClass extends JPanel {

 GridBagConstraints constraints = new GridBagConstraints();
 public MainClass() {
   setLayout(new GridBagLayout());
   constraints.weightx = 1.0;
   constraints.weighty = 1.0;
   constraints.fill = GridBagConstraints.BOTH;
   int x, y;
   constraints.gridheight = 2; // span two rows
   addGB(new JButton("one"), x = 0, y = 0);
   constraints.gridheight = 1; // set it back
   addGB(new JButton("two"), x = 1, y = 0);
   addGB(new JButton("three"), x = 2, y = 0);
   constraints.gridwidth = 2; // span two columns
   addGB(new JButton("four"), x = 1, y = 1);
   constraints.gridwidth = 1; // set it back
 }
 void addGB(Component component, int x, int y) {
   constraints.gridx = x;
   constraints.gridy = y;
   add(component, constraints);
 }
 public static void main(String[] args) {
   JFrame frame = new JFrame("MainClass");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.setSize(200, 200);
   frame.setLocation(200, 200);
   frame.setContentPane(new MainClass());
   frame.setVisible(true);
 }

}


 </source>
   
  
 
  



GridBagConstraints.gridwidth

   <source lang="java">

/*

*
* Copyright (c) 1998 Sun Microsystems, Inc. All Rights Reserved.
*
* Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
* modify and redistribute this software in source and binary code form,
* provided that i) this copyright notice and license appear on all copies of
* the software; and ii) Licensee does not utilize the software in a manner
* which is disparaging to Sun.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
* IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
* NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
* LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
* OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
* LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
* INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
* CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
* OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* This software is not designed or intended for use in on-line control of
* aircraft, air traffic, aircraft navigation or aircraft communications; or in
* the design, construction, operation or maintenance of any nuclear
* facility. Licensee represents and warrants that it will not use or
* redistribute the Software for such purposes.
*/

/*

* ContainerEventDemo.java requires no other files.
*/

import java.awt.Dimension; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.ContainerEvent; import java.awt.event.ContainerListener; import java.util.Vector; import javax.swing.BorderFactory; import javax.swing.JButton; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTextArea; public class Main extends JPanel implements ContainerListener, ActionListener {

 JTextArea display;
 JPanel buttonPanel;
 JButton addButton, removeButton, clearButton;
 Vector<JButton> buttonList;
 static final String ADD = "add";
 static final String REMOVE = "remove";
 static final String CLEAR = "clear";
 static final String newline = "\n";
 public Main() {
   super(new GridBagLayout());
   GridBagLayout gridbag = (GridBagLayout) getLayout();
   GridBagConstraints c = new GridBagConstraints();
   // Initialize an empty list of buttons.
   buttonList = new Vector<JButton>(10, 10);
   // Create all the components.
   addButton = new JButton("Add a button");
   addButton.setActionCommand(ADD);
   addButton.addActionListener(this);
   removeButton = new JButton("Remove a button");
   removeButton.setActionCommand(REMOVE);
   removeButton.addActionListener(this);
   buttonPanel = new JPanel(new GridLayout(1, 1));
   buttonPanel.setPreferredSize(new Dimension(200, 75));
   buttonPanel.addContainerListener(this);
   display = new JTextArea();
   display.setEditable(false);
   JScrollPane scrollPane = new JScrollPane(display);
   scrollPane.setPreferredSize(new Dimension(200, 75));
   clearButton = new JButton("Clear text area");
   clearButton.setActionCommand(CLEAR);
   clearButton.addActionListener(this);
   c.fill = GridBagConstraints.BOTH; // Fill entire cell.
   c.weighty = 1.0; // Button area and message area have equal height.
   c.gridwidth = GridBagConstraints.REMAINDER; // end of row
   gridbag.setConstraints(scrollPane, c);
   add(scrollPane);
   c.weighty = 0.0;
   gridbag.setConstraints(clearButton, c);
   add(clearButton);
   c.weightx = 1.0; // Add/remove buttons have equal width.
   c.gridwidth = 1; // NOT end of row
   gridbag.setConstraints(addButton, c);
   add(addButton);
   c.gridwidth = GridBagConstraints.REMAINDER; // end of row
   gridbag.setConstraints(removeButton, c);
   add(removeButton);
   c.weighty = 1.0; // Button area and message area have equal height.
   gridbag.setConstraints(buttonPanel, c);
   add(buttonPanel);
   setPreferredSize(new Dimension(400, 400));
   setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
 }
 public void componentAdded(ContainerEvent e) {
   displayMessage(" added to ", e);
 }
 public void componentRemoved(ContainerEvent e) {
   displayMessage(" removed from ", e);
 }
 void displayMessage(String action, ContainerEvent e) {
   display.append(((JButton) e.getChild()).getText() + " was" + action
       + e.getContainer().getClass().getName() + newline);
   display.setCaretPosition(display.getDocument().getLength());
 }
 /*
  * This could have been implemented as two or three classes or objects, for
  * clarity.
  */
 public void actionPerformed(ActionEvent e) {
   String command = e.getActionCommand();
   if (ADD.equals(command)) {
     JButton newButton = new JButton("JButton #" + (buttonList.size() + 1));
     buttonList.addElement(newButton);
     buttonPanel.add(newButton);
     buttonPanel.revalidate(); // Make the button show up.
   } else if (REMOVE.equals(command)) {
     int lastIndex = buttonList.size() - 1;
     try {
       JButton nixedButton = buttonList.elementAt(lastIndex);
       buttonPanel.remove(nixedButton);
       buttonList.removeElementAt(lastIndex);
       buttonPanel.revalidate(); // Make the button disappear.
       buttonPanel.repaint(); // Make the button disappear.
     } catch (ArrayIndexOutOfBoundsException exc) {
     }
   } else if (CLEAR.equals(command)) {
     display.setText("");
   }
 }
 /**
  * Create the GUI and show it. For thread safety, this method should be
  * invoked from the event-dispatching thread.
  */
 private static void createAndShowGUI() {
   // Create and set up the window.
   JFrame frame = new JFrame("ContainerEventDemo");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   // Create and set up the content pane.
   JComponent newContentPane = new Main();
   newContentPane.setOpaque(true); // content panes must be opaque
   frame.setContentPane(newContentPane);
   // Display the window.
   frame.pack();
   frame.setVisible(true);
 }
 public static void main(String[] args) {
   // Schedule a job for the event-dispatching thread:
   // creating and showing this application"s GUI.
   javax.swing.SwingUtilities.invokeLater(new Runnable() {
     public void run() {
       createAndShowGUI();
     }
   });
 }

}

 </source>
   
  
 
  



GridBagConstraints.gridx

   <source lang="java">

import java.awt.ruponent; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class MainClass extends JPanel {

 GridBagConstraints constraints = new GridBagConstraints();
 public MainClass() {
   setLayout(new GridBagLayout());
   int x, y; // for clarity
   addGB(new JButton("North"), x = 1, y = 0);
   addGB(new JButton("West"), x = 0, y = 1);
   addGB(new JButton("Center"), x = 1, y = 1);
   addGB(new JButton("East"), x = 2, y = 1);
   addGB(new JButton("South"), x = 1, y = 2);
 }
 void addGB(Component component, int x, int y) {
   constraints.gridx = x;
   constraints.gridy = y;
   add(component, constraints);
 }
 public static void main(String[] args) {
   JFrame frame = new JFrame("GridBag1");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.setSize(225, 150);
   frame.setLocation(200, 200);
   frame.setContentPane(new MainClass());
   frame.setVisible(true);
 }

}


 </source>
   
  
 
  



GridBagConstraints.gridy

   <source lang="java">

//gridx import java.awt.ruponent; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class MainClass extends JPanel {

 GridBagConstraints constraints = new GridBagConstraints();
 public MainClass() {
   setLayout(new GridBagLayout());
   int x, y; // for clarity
   addGB(new JButton("North"), x = 1, y = 0);
   addGB(new JButton("West"), x = 0, y = 1);
   addGB(new JButton("Center"), x = 1, y = 1);
   addGB(new JButton("East"), x = 2, y = 1);
   addGB(new JButton("South"), x = 1, y = 2);
 }
 void addGB(Component component, int x, int y) {
   constraints.gridx = x;
   constraints.gridy = y;
   add(component, constraints);
 }
 public static void main(String[] args) {
   JFrame frame = new JFrame("GridBag1");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.setSize(225, 150);
   frame.setLocation(200, 200);
   frame.setContentPane(new MainClass());
   frame.setVisible(true);
 }

}


 </source>
   
  
 
  



GridBagConstraints.ipadx

   <source lang="java">

import java.awt.ruponent; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class MainClass extends JPanel {

 GridBagConstraints constraints = new GridBagConstraints();
 public MainClass() {
   setLayout(new GridBagLayout());
   int x, y; // for clarity
   addGB(new JButton("North"), x = 1, y = 0);
   constraints.ipadx = 25; // add padding
   constraints.ipady = 25;
   addGB(new JButton("West"), x = 0, y = 1);
   constraints.ipadx = 0; // remove padding
   constraints.ipady = 0;
   addGB(new JButton("Center"), x = 1, y = 1);
   addGB(new JButton("East"), x = 2, y = 1);
   addGB(new JButton("South"), x = 1, y = 2);
 }
 void addGB(Component component, int x, int y) {
   constraints.gridx = x;
   constraints.gridy = y;
   add(component, constraints);
 }
 public static void main(String[] args) {
   JFrame frame = new JFrame("MainClass");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.setSize(250, 250);
   frame.setLocation(200, 200);
   frame.setContentPane(new MainClass());
   frame.setVisible(true);
 }

}


 </source>
   
  
 
  



GridBagConstraints.ipady

   <source lang="java">

import java.awt.ruponent; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class MainClass extends JPanel {

 GridBagConstraints constraints = new GridBagConstraints();
 public MainClass() {
   setLayout(new GridBagLayout());
   int x, y; // for clarity
   addGB(new JButton("North"), x = 1, y = 0);
   constraints.ipadx = 25; // add padding
   constraints.ipady = 25;
   addGB(new JButton("West"), x = 0, y = 1);
   constraints.ipadx = 0; // remove padding
   constraints.ipady = 0;
   addGB(new JButton("Center"), x = 1, y = 1);
   addGB(new JButton("East"), x = 2, y = 1);
   addGB(new JButton("South"), x = 1, y = 2);
 }
 void addGB(Component component, int x, int y) {
   constraints.gridx = x;
   constraints.gridy = y;
   add(component, constraints);
 }
 public static void main(String[] args) {
   JFrame frame = new JFrame("MainClass");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.setSize(250, 250);
   frame.setLocation(200, 200);
   frame.setContentPane(new MainClass());
   frame.setVisible(true);
 }

}


 </source>
   
  
 
  



GridBagConstraints.NONE

   <source lang="java">

import java.awt.Container; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.Insets; import javax.swing.BorderFactory; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.border.Border; public class MainClass {

 public static void main(String[] args) {
   JFrame aWindow = new JFrame();
   aWindow.setBounds(200, 200, 200, 200);
   aWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   Container content = aWindow.getContentPane();
   content.add(new GridBagLayoutPanel());
   aWindow.setVisible(true);
 }

} class GridBagLayoutPanel extends JPanel {

 public GridBagLayoutPanel() {
   GridBagLayout gridbag = new GridBagLayout();
   GridBagConstraints constraints = new GridBagConstraints();
   setLayout(gridbag);
   constraints.weightx = constraints.weighty = 10.0;
   constraints.fill = constraints.NONE;
   constraints.ipadx = 30;
   constraints.ipady = 10;
   addButton("Press", constraints, gridbag);
   constraints.weightx = 5.0;
   constraints.fill = constraints.BOTH;
   constraints.ipadx = constraints.ipady = 0;
   constraints.insets = new Insets(10, 30, 10, 20);
   constraints.gridwidth = constraints.RELATIVE;
   constraints.gridheight = 2;
   addButton("GO", constraints, gridbag);
   constraints.insets = new Insets(0, 0, 0, 0);
   constraints.gridx = 0;
   constraints.fill = constraints.NONE;
   constraints.ipadx = 30;
   constraints.ipady = 10;
   constraints.gridwidth = 1;
   constraints.gridheight = 1;
   addButton("Push", constraints, gridbag);
 }
 private void addButton(String label, GridBagConstraints constraints,
     GridBagLayout layout) {
   Border edge = BorderFactory.createRaisedBevelBorder();
   JButton button = new JButton(label);
   button.setBorder(edge);
   layout.setConstraints(button, constraints);
   add(button);
 }

}


 </source>
   
  
 
  



GridBagConstraints.RELATIVE

   <source lang="java">

import java.awt.Container; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.Insets; import javax.swing.BorderFactory; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.border.Border; public class MainClass {

 public static void main(String[] args) {
   JFrame aWindow = new JFrame();
   aWindow.setBounds(200, 200, 200, 200);
   aWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   Container content = aWindow.getContentPane();
   content.add(new GridBagLayoutPanel());
   aWindow.setVisible(true);
 }

} class GridBagLayoutPanel extends JPanel {

 public GridBagLayoutPanel() {
   GridBagLayout gridbag = new GridBagLayout();
   GridBagConstraints constraints = new GridBagConstraints();
   setLayout(gridbag);
   constraints.weightx = constraints.weighty = 10.0;
   constraints.fill = constraints.NONE;
   constraints.ipadx = 30;
   constraints.ipady = 10;
   addButton("Press", constraints, gridbag);
   constraints.weightx = 5.0;
   constraints.fill = constraints.BOTH;
   constraints.ipadx = constraints.ipady = 0;
   constraints.insets = new Insets(10, 30, 10, 20);
   constraints.gridwidth = constraints.RELATIVE;
   constraints.gridheight = 2;
   addButton("GO", constraints, gridbag);
   constraints.insets = new Insets(0, 0, 0, 0);
   constraints.gridx = 0;
   constraints.fill = constraints.NONE;
   constraints.ipadx = 30;
   constraints.ipady = 10;
   constraints.gridwidth = 1;
   constraints.gridheight = 1;
   addButton("Push", constraints, gridbag);
 }
 private void addButton(String label, GridBagConstraints constraints,
     GridBagLayout layout) {
   Border edge = BorderFactory.createRaisedBevelBorder();
   JButton button = new JButton(label);
   button.setBorder(edge);
   layout.setConstraints(button, constraints);
   add(button);
 }

}


 </source>
   
  
 
  



GridBagConstraints.weightx

   <source lang="java">

import java.awt.ruponent; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class MainClass extends JPanel {

 GridBagConstraints constraints = new GridBagConstraints();
 public MainClass() {
   setLayout(new GridBagLayout());
   constraints.weightx = 1.0;
   constraints.weighty = 1.0;
   constraints.fill = GridBagConstraints.BOTH;
   int x, y; // for clarity
   addGB(new JButton("North"), x = 1, y = 0);
   addGB(new JButton("West"), x = 0, y = 1);
   addGB(new JButton("Center"), x = 1, y = 1);
   addGB(new JButton("East"), x = 2, y = 1);
   addGB(new JButton("South"), x = 1, y = 2);
 }
 void addGB(Component component, int x, int y) {
   constraints.gridx = x;
   constraints.gridy = y;
   add(component, constraints);
 }
 public static void main(String[] args) {
   JFrame frame = new JFrame("MainClass");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.setSize(225, 150);
   frame.setLocation(200, 200);
   frame.setContentPane(new MainClass());
   frame.setVisible(true);
 }

}


 </source>
   
  
 
  



GridBagConstraints.weighty

   <source lang="java">

import java.awt.ruponent; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class MainClass extends JPanel {

 GridBagConstraints constraints = new GridBagConstraints();
 public MainClass() {
   setLayout(new GridBagLayout());
   constraints.weightx = 1.0;
   constraints.weighty = 1.0;
   constraints.fill = GridBagConstraints.BOTH;
   int x, y; // for clarity
   addGB(new JButton("North"), x = 1, y = 0);
   addGB(new JButton("West"), x = 0, y = 1);
   addGB(new JButton("Center"), x = 1, y = 1);
   addGB(new JButton("East"), x = 2, y = 1);
   addGB(new JButton("South"), x = 1, y = 2);
 }
 void addGB(Component component, int x, int y) {
   constraints.gridx = x;
   constraints.gridy = y;
   add(component, constraints);
 }
 public static void main(String[] args) {
   JFrame frame = new JFrame("MainClass");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.setSize(225, 150);
   frame.setLocation(200, 200);
   frame.setContentPane(new MainClass());
   frame.setVisible(true);
 }

}


 </source>
   
  
 
  



new GridBagConstraints()

   <source lang="java">

import java.awt.Container; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.Insets; import javax.swing.BorderFactory; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.border.Border; public class MainClass {

 public static void main(String[] args) {
   JFrame aWindow = new JFrame();
   aWindow.setBounds(200, 200, 200, 200);
   aWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   Container content = aWindow.getContentPane();
   content.add(new GridBagLayoutPanel());
   aWindow.setVisible(true);
 }

} class GridBagLayoutPanel extends JPanel {

 public GridBagLayoutPanel() {
   GridBagLayout gridbag = new GridBagLayout();
   GridBagConstraints constraints = new GridBagConstraints();
   setLayout(gridbag);
   constraints.weightx = constraints.weighty = 10.0;
   constraints.fill = constraints.NONE;
   constraints.ipadx = 30;
   constraints.ipady = 10;
   addButton("Press", constraints, gridbag);
   constraints.weightx = 5.0;
   constraints.fill = constraints.BOTH;
   constraints.ipadx = constraints.ipady = 0;
   constraints.insets = new Insets(10, 30, 10, 20);
   constraints.gridwidth = constraints.RELATIVE;
   constraints.gridheight = 2;
   addButton("GO", constraints, gridbag);
   constraints.insets = new Insets(0, 0, 0, 0);
   constraints.gridx = 0;
   constraints.fill = constraints.NONE;
   constraints.ipadx = 30;
   constraints.ipady = 10;
   constraints.gridwidth = 1;
   constraints.gridheight = 1;
   addButton("Push", constraints, gridbag);
 }
 private void addButton(String label, GridBagConstraints constraints,
     GridBagLayout layout) {
   Border edge = BorderFactory.createRaisedBevelBorder();
   JButton button = new JButton(label);
   button.setBorder(edge);
   layout.setConstraints(button, constraints);
   add(button);
 }

}


 </source>
   
  
 
  



new GridBagConstraints(int gx, int gy, int gw, int gh, double wx, double wy, int a, int f, Insets i, int ipx, int ipy)

   <source lang="java">

import java.awt.ruponent; import java.awt.Container; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.Insets; import javax.swing.JButton; import javax.swing.JFrame; public class MainClass {

 public static void main(String[] a) {
   final JFrame frame = new JFrame("GridBagLayout");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   frame.setLayout(new GridBagLayout());
   JButton button;
   button = new JButton("One");
   addComponent(frame, button, 0, 0, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
   button = new JButton("Two");
   addComponent(frame, button, 1, 0, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
   button = new JButton("Three");
   addComponent(frame, button, 0, 1, 2, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
   button = new JButton("Four");
   addComponent(frame, button, 0, 2, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.NONE);
   frame.setSize(500, 200);
   frame.setVisible(true);
 }
 private static void addComponent(Container container, Component component, int gridx, int gridy,
     int gridwidth, int gridheight, int anchor, int fill) {
   Insets insets = new Insets(0,0,0,0);
   GridBagConstraints gbc = new GridBagConstraints(gridx, gridy, gridwidth, gridheight, 1.0, 1.0,
       anchor, fill, insets, 0, 0);
   container.add(component, gbc);
 }

}


 </source>