Hi Friend,

We have created an example in swing. Here is the code:

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

class FactorialExample extends JFrame{
JTextField t1,t2;
FactorialExample(){
JLabel l1=new JLabel("Enter Number: ");
JLabel l2=new JLabel("Factorial of Input Number: ");
t1=new JTextField(20);
t2=new JTextField(20);
JPanel p=new JPanel(new GridLayout(3,2));
JButton b=new JButton("Find");
b.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
String number=t1.getText();
int num=Integer.parseInt(number);
long fac=num;
for(int i=num;i>1;i--)
{
fac=fac*(i-1);
}
t2.setText(Long.toString(fac));

}
});
p.add(l1);
p.add(t1);
p.add(l2);
p.add(t2);
p.add(b);
add(p);
setVisible(true);
pack();
}
public static void main(String[] args) {
FactorialExample f=new FactorialExample();
}
}

Thanks