class diamond                                     //class diamond
{
   public static void main( String args[] )       //main method
   {
	int  i , j , k, n = 24;                   //n is the number of lines and i,j are used for loops

	k=(n%2==0)? n-1:n;                        //k is used to control the number of spaces to be printed

	for(  i = 0  ;  i < n/2  ;  i++ )         //for the top portion of the diamond
	{
             for( j = 0 ; j < k / 2 - i ; j++ )   //print required spaces
                 System.out.print(" ");

             for ( j = 0 ; j < i * 2 + 1 ; j++ )  //print required stars
 	           System.out.print("*");

             System.out.println();                //line break after the end of a line
        }

        if( n % 2 != 0)                           //if the number of lines is odd
        {
           for( i = 0 ; i < n ; i++ )             //print extra asterisks in the middle
                System.out.print("*");

           System.out.println();                  //line break
        }

        for( i = n/2-1  ;  i >= 0  ;  i-- )       //for the bottom portion of the diamond
	{
             for( j = 0 ; j < k/2 - i ; j++ )     //print required spaces
                 System.out.print(" ");

             for( j = 0 ; j < i*2+1 ; j++ )       //print required stars
                 System.out.print("*");

             System.out.println();                //line break after the end of a line
        }
    }                                             //end main
}                                                 //end class diamond

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


public class Email extends JPanel
{

JButton button;

public JPanel()
{

setLayout(null)
setBackground(Color.green);
setPreferredSize(new Dimension(300,300));

button = new JButton("Send");
button.setBounds(100,150,50,20);
button.setToolTextTip("send the email");

add(button);

button.addActionListener(new buttonListener());
}

public class buttonListener implements ActionListener
{
    public void actionPerformed( ActionEvent event)
    {
       if(event.getSource() == button)
       {
       // do what you want
       }
    }
}

public static void main(String [] args)
{
      JFrame frame = new JFrame("Button Example");
      frame.getContentPane().add(new Email());
      frame.pack()
      frame.setVisible(true);
      frame.setDefaultCloseOperation(3);
}

}