Gridbag Layout examples in java

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

public class MyGridBagEx implements ActionListener
{

  JFrame frame;
  JPanel pan,pann;
  JButton add,update,del;
  JButton test,ok,cancel,exit;
  

public MyGridBagEx()
  {
  frame= new JFrame();
 
  int width=500,height=350;
  Dimension screen = Toolkit.getDefaultToolkit().getScreenSize();
  int x= (screen.width-width)/2;
  int y= (screen.height-height)/2;
  frame.setBounds(x,y,width,height);
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  frame.setTitle("Testing Application");
 
  Container contentPane = frame.getContentPane();
  
    
    pann = new JPanel();
    pann.setLayout(new BorderLayout());
    pann.setOpaque(true);
    pann.setBorder(BorderFactory.createLineBorder(Color.RED));
   
    pan =new JPanel();
   
    pan.setLayout(new GridBagLayout());
    GridBagConstraints c = new GridBagConstraints();
   
    pan.setBackground(new Color(202,215,237));
    pan.setOpaque(true);
    pan.setBorder(BorderFactory.createLineBorder(Color.BLACK));
   
   
    add= new JButton("Add");
    c.gridx = 0;
    c.gridy = 0;
    pan.add(add, c);
   
   
    update= new JButton("Update");
   
    c.gridx = 1;
    c.gridy = 0;
    pan.add(update, c);
  
   
    del= new JButton("Delete");
    c.gridx = 2;
    c.gridy = 0;
    pan.add(del, c);
   

   
    ok= new JButton("OK- This is Ok Button for testing");
    c.ipady = 40;     
    c.weightx = 0.0;
    c.gridwidth = 3;
    c.gridx = 0;
    c.gridy = 1;
    ok.addActionListener(this);
    pan.add(ok, c);
  
   
    cancel= new JButton("Press Cancel ");
    c.ipady = 0;       //reset to default
    c.weighty = 1.0;   //request any extra vertical space
    c.anchor = GridBagConstraints.PAGE_END; //bottom of space
    c.insets = new Insets(10,0,0,0);  //top padding
    c.gridx = 1;       //aligned with button 2
    c.gridwidth = 2;   //2 columns wide
    c.gridy = 2;       //third row
    cancel.addActionListener(this);
    pan.add(cancel, c);
   
   
    exit= new JButton("Exit");
    c.ipady = 0;
    c.gridwidth = 1;
   
    c.gridx = 0;
    c.gridy = 2;
    pan.add(exit,c);

    test= new JButton("Testing");
    c.gridx = 3;
    c.gridy = 0;
    pan.add(test, c);   
   
   
    pann.add(pan, BorderLayout.NORTH);
              
    contentPane.add(pann);
   
    frame.setVisible(true);
      }

public void actionPerformed(ActionEvent e)
  {
   if(e.getSource() == ok)
      {
         JOptionPane.showMessageDialog(null," Ok");
        }

    if(e.getSource() == cancel)
       {
         System.exit(0);
       }

   }


public static void main (String []arg)
    {
    MyGridBagEx f = new MyGridBagEx();
    }
}

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