BirthDay

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
import java.util.*;
import java.text.*;
import java.text.DateFormatSymbols;
import java.util.Calendar;

public class BDay extends JFrame{
int row,col;
Container pane;
JTextArea textArea;
String output=" ",inputbd,Name;
String fdt="MM/dd/yyyy";
public static void main(String[] args){
BDay brtdy=new BDay();
brtdy.setBounds(100,100,350,250);
brtdy.setVisible(true);
}

public BDay(){
super("HAPPY BIRTHDAY");
pane=getContentPane();
pane.setCursor(Cursor.getPredefinedCursor(Cursor.TEXT_CURSOR));

textArea=new JTextArea(row,col);
addWindowListener(new WindowHandler());
input();
textArea.setText(output);
pane.add(textArea);
pane.add(new TopPanel(),BorderLayout.NORTH);
pane.add(new BottomPanel(),BorderLayout.SOUTH);
}
void input(){
String dformat,dform;
int age;
Name=JOptionPane.showInputDialog("Enter Name:");
inputbd = JOptionPane.showInputDialog("Enter Date Of Birth in this form "+"\n"+"Example:\n 01/25/1940");
try{
SimpleDateFormat df= new SimpleDateFormat(fdt);
df.setLenient(false);
java.util.Date d = df.parse(inputbd);
Calendar dateofbirth = Calendar.getInstance();
dateofbirth.setTime(d);
Calendar today = Calendar.getInstance();
age = today.get(Calendar.YEAR) - dateofbirth.get(Calendar.YEAR);
dformat = " MMMM, dd,EEEE--yyyy";
dform="MM,dd,yyyy";
SimpleDateFormat sdf = new SimpleDateFormat(dformat);
SimpleDateFormat sdf2 = new SimpleDateFormat(dform);
output +="Name:"+ Name + "\n\n";
output +="Date of Birth:"+sdf2.format(dateofbirth.getTime())+"\n";
output+="You were born:" + " " + sdf.format(dateofbirth.getTime())+ "\n\n";
dateofbirth.set(Calendar.YEAR,2002);
output +="You are"+" "+age+" "+"years old this year:"+" "+sdf.format(dateofbirth.getTime());
}
catch(ParseException e){

JOptionPane.showMessageDialog(null,"Date is invalid ","Try another",JOptionPane.ERROR_MESSAGE);

}
}

class WindowHandler extends WindowAdapter{
public void windowClosing(WindowEvent e){
System.exit(0);
}
}
}