Java by API/java.awt/GridBagConstraints

GridBagConstraints.BOTH

 
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);
  }
}

GridBagConstraints.CENTER

 
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);
  }
}

GridBagConstraints.fill

 
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);
  }
}

GridBagConstraints.gridheight

 
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);
  }
}

GridBagConstraints.gridwidth

 
/*
 *
 * 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();
      }
    });
  }
}

GridBagConstraints.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);
  }
}

GridBagConstraints.gridy

 
//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);
  }
}

GridBagConstraints.ipadx

 
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);
  }
}

GridBagConstraints.ipady

 
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);
  }
}

GridBagConstraints.NONE

 
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);
  }
}

GridBagConstraints.RELATIVE

 
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);
  }
}

GridBagConstraints.weightx

 
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);
  }
}

GridBagConstraints.weighty

 
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);
  }
}

new GridBagConstraints()

 
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);
  }
}

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

 
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);
  }
}